Heat & Glo Mezzo Series Install Manual

1

Heat & Glo • MEZZO36, MEZZO36ST, MEZZO48, MEZZO48ST Installation Manual • 2300-970 Rev. T • 3/16

Models:

Installation Manual

Installation and Appliance Setup

INSTALLER: Leave this manual with party responsible for use and operation.

OWNER: Retain this manual for future reference.

MEZZO36

MEZZO36ST

MEZZO48

MEZZO48ST

MEZZO60

MEZZO60ST

MEZZO72

MEZZO72ST

NOTICE: DO NOT discard this manual!

In the Commonwealth of Massachusetts installation must be

performed by a licensed plumber or gas ﬁ tter.

See Table of Contents for location of additional Commonwealth

of Massachusetts requirements.

This appliance may be installed as an OEM

installation in manufactured home (USA

only) or mobile home and must be installed

in accordance with the manufacturer’s

instructions and the Manufactured Home

Construction and Safety Standard, Title 24

CFR, Part 3280 in the United States, or the

Standard for Installation in Mobile Homes,

CAN/CSA Z240 MH Series, in Canada.

This appliance is only for use with the type(s)

of gas indicated on the rating plate. This

appliance is not convertible for use with other

gases, unless a certiﬁ ed kit is used.

• DO NOT store or use gasoline or other ﬂ am-

mable vapors and liquids in the vicinity of this

or any other appliance.

• What to do if you smell gas

- DO NOT try to light any appliance.

- DO NOT touch any electrical switch. DO

NOT use any phone in your building.

- Leave the building immediately.

- Immediately call your gas supplier from

a neighbor’s phone. Follow the gas sup-

plier’s instructions.

- If you cannot reach your gas supplier, call

the ﬁ re department.

• Installation and service must be performed

by a qualiﬁ ed installer, service agency, or the

gas supplier.

WARNING:

FIRE OR EXPLOSION HAZARD

Failure to follow safety warnings exactly

could result in serious injury, death, or

property damage.

DANGER

HOT GLASS WILL

CAUSE BURNS.

DO NOT TOUCH GLASS

UNTIL COOLED.

NEVER ALLOW CHILDREN

TO TOUCH GLASS.

A barrier designed to reduce the risk of

burns from the hot viewing glass is provided

with this appliance and shall be installed for

the protection of children and other at-risk

individuals.

2Heat & Glo • MEZZO36/ST, MEZZO48/ST MEZZO60/ST, MEZZO72/ST Installation Manual • 2300-970 Rev. T • 3/16

Safety Alert Key:

• DANGER! Indicates a hazardous situation which, if not avoided will result in death or serious injury.

• WARNING! Indicates a hazardous situation which, if not avoided could result in death or serious injury.

• CAUTION! Indicates a hazardous situation which, if not avoided, could result in minor or moderate injury.

• NOTICE: Used to address practices not related to personal injury.

Table of Contents

Installation Standard Work Checklist . . . . . . . . . . . . . . . . . . . . 3

1 Product Speciﬁ c and Important Safety Information

A. Appliance Certiﬁ cation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

B. Glass Speciﬁ cations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

C. BTU Speciﬁ cations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

D. High Altitude Installations . . . . . . . . . . . . . . . . . . . . . . . . . . 4

E. Non-Combustible Materials Speciﬁ cation. . . . . . . . . . . . . . 5

F. Combustible Materials Speciﬁ cation . . . . . . . . . . . . . . . . . 5

G. Electrical Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

H. Requirements for the Commonwealth of Massachusetts . . 6

2 Getting Started

A. Design and Installation Considerations . . . . . . . . . . . . . . . 7

B. Good Faith Wall Surface/TV Guidelines . . . . . . . . . . . . . . 7

C. Tools and Supplies Needed . . . . . . . . . . . . . . . . . . . . . . . . 8

D. Inspect Appliance and Components . . . . . . . . . . . . . . . . . . 8

3 Framing and Clearances

A. Appliance/Decorative Front Dimension Diagrams . . . . . . . 9

B. Clearances to Combustibles . . . . . . . . . . . . . . . . . . . . . . 16

C. Constructing the Appliance Chase . . . . . . . . . . . . . . . . . . 17

D. Floor Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

4 Termination Location and Vent Information

A. Vent Termination Minimum Clearances . . . . . . . . . . . . . . 21

B. Chimney Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

C. Approved Pipe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

D. Use of Elbows . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

E. Measuring Standards . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

F. Vent Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

5 Vent Clearances and Framing

A. Pipe Clearances to Combustibles . . . . . . . . . . . . . . . . . . 31

B. Wall Penetration Framing/Firestops . . . . . . . . . . . . . . . . . 31

C. Install the Ceiling Firestop . . . . . . . . . . . . . . . . . . . . . . . . 32

D. Install Attic Insulation Shield . . . . . . . . . . . . . . . . . . . . . . . 32

E. Installing the Optional Heat-Zone® Gas Kit . . . . . . . . . . . 33

6 Appliance Preparation

A. Vent Collar Preparation . . . . . . . . . . . . . . . . . . . . . . . . . . 34

B. Securing and Leveling the Appliance . . . . . . . . . . . . . . . . 35

C. Installing Non-Combustible Facing Material . . . . . . . . . . 36

7 Venting and Chimneys

A. Assemble Vent Sections . . . . . . . . . . . . . . . . . . . . . . . . . 37

B. Assemble Slip Sections . . . . . . . . . . . . . . . . . . . . . . . . . . 38

C. Secure The Vent Sections . . . . . . . . . . . . . . . . . . . . . . . . 38

D. Disassemble Vent Sections . . . . . . . . . . . . . . . . . . . . . . . 39

E. Vertical Termination Requirements . . . . . . . . . . . . . . . . . . 40

F. Horizontal Termination Requirements . . . . . . . . . . . . . . . 41

8 Electrical Information

A. General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

B. Wiring Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

9 Gas Information

A. Fuel Conversion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

B. Gas Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

C. Gas Service Access . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

D. Gas Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

E. High Altitude Installations . . . . . . . . . . . . . . . . . . . . . . . . . 47

F. Air Shutter Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

10 Finishing

A. Facing and Finishing Instructions. . . . . . . . . . . . . . . . . . . 49

B. Mantel and Wall Projections . . . . . . . . . . . . . . . . . . . . . . . 56

C. Decorative Front Dimensions for Finishing . . . . . . . . . . . 58

11 Appliance Setup

A. Fixed Glass Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

B. Remove the Shipping Materials/Install Vanity Panel . . . 59

C. Clean the Appliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

D. Install Glass Refractory Panels . . . . . . . . . . . . . . . . . . . . 59

E. Install Media . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

F. Install Log Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

12 Reference Materials

A. Vent Components Diagrams . . . . . . . . . . . . . . . . . . . . . . 62

B. Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

 = Contains updated information.



3

Heat & Glo • MEZZO36, MEZZO36ST, MEZZO48, MEZZO48ST Installation Manual • 2300-970 Rev. T • 3/16

Installation Standard Work Checklist

Customer:

Lot/Address:

Model (circle one):MEZZO36 MEZZO48 MEZZO60 MEZZO72

MEZZO36ST MEZZO48ST MEZZO60ST MEZZO72ST

Date Installed:

Location of Fireplace:

Installer:

Dealer/Distributor Phone #

Serial #:

Comments: Further description of the issues, who is responsible (Installer/ Builder/ Other Trades, etc) and corrective

action needed _____________________________________________________________________________________

_________________________________________________________________________________________________

Comments Communicated to party responsible ____________________ by ______________________on ___________

(Builder / Gen. Contractor/) (Installer) (Date)

Appliance Install Sections 3 and 6 YES IF NO, WHY?

Veri¿ ed that the chase is insulated and sealed. (Pg. 17) ___________________________

Required factory included non-combustible board is installed. (Pg 36) ___________________________

Veri¿ ed clearances to combustibles. (Pg. 16-17) ___________________________

Fireplace is leveled and secured. (Pg. 35) ___________________________

Pipe heat shield is attached to header. Header no wider than 3.5 in.(2x4)

(Pg. 18, 19, 34) ___________________________

Venting/Chimney Sections 4,5 and 7

Venting con¿ guration complies to vent diagrams. (Pg 23-30) ___________________________

Venting installed, locked, and secured in place with proper clearance. ___________________________

Firestops installed. (Section 5) ___________________________

Attic insulation shield installed. (Pg 32) ___________________________

Exterior wall/Roof À ashing installed and sealed. (Section 7) ___________________________

Terminations installed and sealed. (Section 7) ___________________________

Electrical Section 8 (Pg 43-44)

Unswitched power (110-120 VAC) provided to the appliance. ___________________________

Switch wires properly installed. ___________________________

Gas Section 9 (Pg 45-48)

Proper appliance for fuel type. ___________________________

Was a conversion performed? ___________________________

Leak check performed and inlet pressure veri¿ ed. ___________________________

Veri¿ ed proper air shutter setting for installation type. ___________________________

Finishing Section 10 (Pg 49-58)

Combustible materials not installed in non-combustible areas. ___________________________

Veri¿ ed all clearances meet installation manual requirements. ___________________________

Finishing done correctly using inside ¿ t or overlap ¿ t method. ___________________________

Finishing template removed. ___________________________

Mantels and wall projections comply with installation manual requirements. ___________________________

Appliance Setup Section 11 (Pg 59-61)

All packaging and protective materials removed (inside & outside of appliance). ___________________________

Refractories and media installed correctly. ___________________________

Glass assembly installed and secured. ___________________________

Accessories installed properly. ___________________________

Decorative front properly installed. ___________________________

Manual bag and all of its contents are removed from inside/under

the appliance and given to party responsible for use and operation. ___________________________

Started appliance and veri¿ ed no gas leaks exist. ___________________________

Lights work in all switched positions (if so equipped). ___________________________

Component heat shield is installed. (Pg. 43.) ___________________________

2300-972 Rev. E 3/16

Î = Contains updated information.

Hearth & Home Technologies recommends the following:

• Photographing the installation and copying this checklist for your ¿ le.

• That this checklist remain visible at all times on the appliance until the installation is complete.

This standard work checklist is to be used by the installer in conjunction with, not instead of, the instructions contained in this

installation manual.

WARNING! Risk of Fire or Explosion! Failure to install appliance according to these instructions can

lead to a ¿ re or explosion.

ATTENTION INSTALLER:

Follow this Standard Work Checklist



4Heat & Glo • MEZZO36/ST, MEZZO48/ST MEZZO60/ST, MEZZO72/ST Installation Manual • 2300-970 Rev. T • 3/16

B. Glass Speciﬁ cations

This appliance is equipped with 5 mm ceramic glass. Re-

place glass only with 5 mm ceramic glass. Please contact

your dealer for replacement glass.

This product is listed to ANSI standards for “Vented Gas

Fireplace Heaters” and applicable sections of “Gas Burn-

ing Heating Appliances for Manufactured Homes and

Recreational Vehicles”, and “Gas Fired Appliances for

Use at High Altitudes”.

A. Appliance Certiﬁ cation

NOT INTENDED FOR USE AS A PRIMARY HEAT SOURCE.

This appliance is tested and approved as either supplemen-

tal room heat or as a decorative appliance. It should not be

factored as primary heat in residential heating calculations.

NOTICE: This installation must conform with local codes.

In the absence of local codes you must comply with the

National Fuel Gas Code, ANSI Z223.1-latest edition in

the U.S.A. and the CAN/CGA B149 Installation Codes in

Canada.

1

1 Product Speciﬁ c and Important Safety Information

MODEL: MEZZO36, MEZZO36ST, MEZZO48,MEZZO48ST,

MEZZO60, MEZZO60ST, MEZZO72, MEZZO72ST

LABORATORY: Underwriters Laboratories, Inc. (UL)

TYPE: Direct Vent Heater

STANDARD: ANSI Z21.88-2014/CSA 2.33-2014

C. BTU Speciﬁ cations

D. High Altitude Installations

NOTICE: If the heating value of the gas has been reduced,

these rules do not apply. Check with your local gas utility

or authorities having jurisdiction.

When installing above 2000 feet elevation:

• In the USA: Reduce input rate 4% for each 1000 feet

above 2000 feet.

• In CANADA: Input ratings are certiﬁ ed without a

reduction of input rate for elevations up to 4500 feet

(1370 m)above sea level. Please consult provincial and/

or local authorities having jurisdiction for installations at

elevations above 4500 feet (1370 m).

Check with your local gas utility to determine proper

oriﬁ ce size.

Models

(U.S. or Canada)

Maximum

Input BTU/h

Minimum

Input

BTU/h

Oriﬁ ce

Size

(DMS)

MEZZO36

(NG) (0-2000 FT) 30,000 17,500 #36

MEZZO36

(Propane) (0-2000 FT) 29,000 15,500 #52

MEZZO36ST

(NG) (0-2000 FT) 30,000 17,500 #36

MEZZO36ST

(Propane) (0-2000 FT) 29,000 15,500 #52

MEZZO48

(NG) (0-2000 FT) 40,000 21,000 .124

MEZZO48

(Propane) (0-2000 FT) 36,000 19,500 #49

MEZZO48ST

(NG) (0-2000 FT) 40,000 21,000 .124

MEZZO48ST

(Propane) (0-2000 FT) 36,000 19,500 #49

MEZZO60

(NG) (0-2000 FT) 50,000 26,000 #28

MEZZO60

(LP) (0-2000 FT) 41,000 22,000 #48

MEZZO60ST

(NG) (0-2000 FT) 50,000 26,000 #28

MEZZO60ST

(LP) (0-2000 FT) 41,000 22,000 #48

MEZZO72

(NG) (0-2000 FT) 58,000 30,000 #23

MEZZO72

(LP) (0-2000 FT) 46,000 24,000 #45

MEZZO72ST

(NG) (0-2000 FT) 58,000 30,000 #23

MEZZO72ST

(LP) (0-2000 FT) 46,000 24,000 #45

5

Heat & Glo • MEZZO36, MEZZO36ST, MEZZO48, MEZZO48ST Installation Manual • 2300-970 Rev. T • 3/16

E. Non-Combustible Materials Speciﬁ cation

Material which will not ignite and burn. Such materials are

those consisting entirely of steel, iron, brick, tile, concrete,

slate, glass or plasters, or any combination thereof.

Materials that are reported as passing ASTM E 136,

Standard Test Method for Behavior of Materials in

a Vertical Tube Furnace at 750 ºC shall be considered

non-combustible materials.

F. Combustible Materials Speciﬁ cation

Materials made of or surfaced with wood, compressed pa-

per, plant ﬁ bers, plastics, or other material that can ignite

and burn, whether ﬂ ame proofed or not, or plastered or

unplastered shall be considered combustible materials.

G. Electrical Codes

NOTICE: This appliance must be electrically wired

and grounded in accordance with local codes or, in the

absence of local codes, with National Electric Code

ANSI/NFPA 70-latest edition or the Canadian Electric

Code CSA C22.1.

• A 110-120 VAC circuit for this product must be pro-

tected with ground-fault circuit-interrupter protection,

in compliance with the applicable electrical codes,

when it is installed in locations such as in bathrooms

or near sinks.

6Heat & Glo • MEZZO36/ST, MEZZO48/ST MEZZO60/ST, MEZZO72/ST Installation Manual • 2300-970 Rev. T • 3/16

H. Requirements for the Commonwealth of

Massachusetts

For all side wall horizontally vented gas fueled equipment

installed in every dwelling, building or structure used in

whole or in part for residential purposes, including those

owned or operated by the Commonwealth and where the

side wall exhaust vent termination is less than seven (7)

feet above ﬁ nished grade in the area of the venting, in-

cluding but not limited to decks and porches, the following

requirements shall be satisﬁ ed:

Installation of Carbon Monoxide Detectors

At the time of installation of the side wall horizontal vented

gas fueled equipment, the installing plumber or gas ﬁ tter

shall observe that a hard wired carbon monoxide detector

with an alarm and battery back-up is installed on the ﬂ oor

level where the gas equipment is to be installed. In addi-

tion, the installing plumber or gas ﬁ tter shall observe that

a battery operated or hard wired carbon monoxide detec-

tor with an alarm is installed on each additional level of

the dwelling, building or structure served by the side wall

horizontal vented gas fueled equipment. It shall be the

responsibility of the property owner to secure the services

of qualiﬁ ed licensed professionals for the installation of

hard wired carbon monoxide detectors.

In the event that the side wall horizontally vented gas fu-

eled equipment is installed in a crawl space or an attic,

the hard wired carbon monoxide detector with alarm and

battery back-up may be installed on the next adjacent

ﬂ oor level.

In the event that the requirements of this subdivision can

not be met at the time of completion of installation, the

owner shall have a period of thirty (30) days to comply

with the above requirements; provided, however, that dur-

ing said thirty (30) day period, a battery operated carbon

monoxide detector with an alarm shall be installed.

Approved Carbon Monoxide Detectors

Each carbon monoxide detector as required in accor-

dance with the above provisions shall comply with NFPA

720 and be ANSI/UL 2034 listed and IAS certiﬁ ed.

Signage

A metal or plastic identiﬁ cation plate shall be permanent-

ly mounted to the exterior of the building at a minimum

height of eight (8) feet above grade directly in line with the

exhaust vent terminal for the horizontally vented gas fu-

eled heating appliance or equipment. The sign shall read,

in print size no less than one-half (1/2) in. in size, “GAS

VENT DIRECTLY BELOW. KEEP CLEAR OF ALL OB-

STRUCTIONS”.

Inspection

The state or local gas inspector of the side wall horizon-

tally vented gas fueled equipment shall not approve the

installation unless, upon inspection, the inspector ob-

serves carbon monoxide detectors and signage installed

in accordance with the provisions of 248 CMR 5.08(2)(a)1

through 4.

Exemptions

The following equipment is exempt from 248 CMR 5.08(2)

(a)1 through 4:

• The equipment listed in Chapter 10 entitled “Equipment

Not Required To Be Vented” in the most current edition

of NFPA 54 as adopted by the Board; and

• Product Approved side wall horizontally vented gas fu-

eled equipment installed in a room or structure separate

from the dwelling, building or structure used in whole or

in part for residential purposes.

MANUFACTURER REQUIREMENTS

Gas Equipment Venting System Provided

When the manufacturer of Product Approved side wall

horizontally vented gas equipment provides a venting

system design or venting system components with the

equipment, the instructions provided by the manufacturer

for installation of the equipment and the venting system

shall include:

• Detailed instructions for the installation of the venting

system design or the venting system components; and

• A complete parts list for the venting system design or

venting system.

Gas Equipment Venting System NOT Provided

When the manufacturer of a Product Approved side wall

horizontally vented gas fueled equipment does not pro-

vide the parts for venting the ﬂ ue gases, but identiﬁ es

“special venting systems”, the following requirements

shall be satisﬁ ed by the manufacturer:

• The referenced “special venting system” instructions

shall be included with the appliance or equipment in-

stallation instructions; and

• The “special venting systems” shall be Product Ap-

proved by the Board, and the instructions for that sys-

tem shall include a parts list and detailed installation

instructions.

A copy of all installation instructions for all Product Ap-

proved side wall horizontally vented gas fueled equip-

ment, all venting instructions, all parts lists for venting

instructions, and/or all venting design instructions shall

remain with the appliance or equipment at the completion

of the installation.

See Gas Connection section for additional Common-

wealth of Massachusetts requirements.

Note: The following requirements reference various

Massachusetts and national codes not contained in this

document.

7

Heat & Glo • MEZZO36, MEZZO36ST, MEZZO48, MEZZO48ST Installation Manual • 2300-970 Rev. T • 3/16

2

2 Getting Started

A. Design and Installation Considerations

Heat & Glo direct vent gas appliances are designed to

operate with all combustion air siphoned from outside of

the building and all exhaust gases expelled to the outside.

No additional outside air source is required.

Installation MUST comply with local, regional, state and

national codes and regulations. Consult insurance carrier,

local building inspector, ﬁ re ofﬁ cials or authorities having

jurisdiction over restrictions, installation inspection and

permits.

Before installing, determine the following:

• Where the appliance is to be installed.

• The vent system conﬁ guration to be used.

• Gas supply piping.

• Electrical wiring requirements.

• Framing and ﬁ nishing details.

• Whether optional accessories—devices such as a wall

switch or remote control—are desired.

Improper installation, adjustment, alteration, service or

maintenance can cause injury or property damage. For

assistance or additional information, consult a qualiﬁ ed

service technician, service agency or your dealer.

Installation and service of this

appliance should be performed by

qualiﬁ ed personnel. Hearth & Home

Technologies recommends HHT

Factory Trained or NFI certified

professionals.

Figure 2.1 Good Faith Wall Surface Temperatures Above Appliance

(MEZZO36/MEZZO36ST/MEZZO48/MEZZO48ST)

B. Good Faith Wall Surface/TV Guidelines

NOTICE: Temperatures listed above are taken with a

temperature measuring probe as prescribed by the test

standard used for appliance certiﬁ cation. Temperatures

on walls or mantels taken with an infrared thermometer

may yield increased temperatures of up to 30 degrees or

more depending on the thermometer settings and material

characteristics being measured.

MEASUREMENTS FROM

TOP EDGE OF THE OPENING

6 in.

18 in.

24 in.

30 in.

36 in.

48 in.

TO CEILING

42 in.

12 in.

170°F

APPLIANCE FRONT

155°F

145°F

140°F

130°F

125°F

Figure 2.2. Good Faith Wall Surface Temperatures Above Appliance

(MEZZO60/MEZZO60ST/MEZZO72/MEZZO72ST)

MEASUREMENTS FROM

TOP EDGE OF THE OPENING

6 in.

18 in.

24 in.

30 in.

36 in.

48 in.

TO CEILING

42 in.

12 in.

245°F

APPLIANCE FRONT

190°F

155°F

140°F

135°F

125°F



8Heat & Glo • MEZZO36/ST, MEZZO48/ST MEZZO60/ST, MEZZO72/ST Installation Manual • 2300-970 Rev. T • 3/16

D. Inspect Appliance and Components

• Carefully remove the appliance and components from

the packaging.

• The vent system components and decorative doors and

fronts may be shipped in separate packages.

• If packaged separately, the media, refractory, and/or

optional log kits must be installed.

• Report to your dealer any parts damaged in shipment,

particularly the condition of the glass.

• Read all of the instructions before starting the instal-

lation. Follow these instructions carefully during the

installation to ensure maximum safety and beneﬁ t.

WARNING! Risk of Fire or Explosion! Damaged parts

could impair safe operation. DO NOT install damaged, in-

complete or substitute components. Keep appliance dry.

C. Tools and Supplies Needed

Before beginning the installation be sure that the following

tools and building supplies are available.

Tape measure Framing material

Pliers Non-corrosive leak check solution

Hammer Phillips screwdriver

Gloves Framing square

Voltmeter Electric drill and bits (1/4 in. magnetic)

Plumb line Safety glasses

Level Reciprocating saw

Manometer Flat blade screwdriver

1/2 - 3/4 in. length, #6 or #8 Self-drilling screws

Caulking material (300ºF minimum continuous exposure

rating)

Hearth & Home Technologies disclaims any responsibility

for, and the warranty will be voided by, the following actions:

• Installation and use of any damaged appliance or vent

system component.

• Modiﬁ cation of the appliance or vent system.

• Installation other than as instructed by Hearth & Home

Technologies.

• Improper positioning of the gas logs or the glass door.

• Installation and/or use of any component part not approved

by Hearth & Home Technologies.

Any such action may cause a ﬁ re hazard.

WARNING! Risk of Fire, Explosion or Electric Shock!

DO NOT use this appliance if any part has been under

water. Call a qualiﬁ ed service technician to inspect the

appliance and to replace any part of the control system

and/or gas control which has been under water.

9

Heat & Glo • MEZZO36, MEZZO36ST, MEZZO48, MEZZO48ST Installation Manual • 2300-970 Rev. T • 3/16

3

3 Framing and Clearances

Figure 3.1 Appliance Dimensions - MEZZO36, MEZZO48

A. Appliance/Decorative Front Dimension Diagrams

Dimensions are actual appliance dimensions. Use for reference only. For framing dimensions and clearances refer to Section 5.

B

A

C

D

E

F

G

H

I

J

K

M

o

N

O

P

Q

S

T

R

U

GAS ACCESS ELECTRICAL ACCESS

CENTERED ON APPLIANCE

L

V

Location MEZZO36 MEZZO48

Inches Millimeters Inches Millimeters

A 50 1270 62 1575

B 39-1/4 997 51-1/8 1299

C 15-5/8 397 15-5/8 397

D 42-1/2 1080 42-1/2 1080

E 4 102 4 102

F 8-9/16 217 8-9/16 217

G 63 1600 63 1600

H 8-9/16 217 8-9/16 217

I125125

J 46-3/16 1173 58 1473

K 17-1/8 435 17-1/8 435

Location MEZZO36 MEZZO48

Inches Millimeters Inches Millimeters

L 8 203 8 203

M 18-5/8 471 18-5/8 471

N 41-3/4 1060 41-3/4 1060

O 2-3/8 60 2-3/8 60

P 8-9/16 217 8-9/16 217

Q 24-1/2 622 24-1/2 622

R 7-1/4 184 7-1/4 184

S 8-7/8 225 8-7/8 225

T 2-3/4 70 2-3/4 70

U 23-3/4 603 23-3/4 603

V 30-1/2 775 30-1/2 775

10 Heat & Glo • MEZZO36/ST, MEZZO48/ST MEZZO60/ST, MEZZO72/ST Installation Manual • 2300-970 Rev. T • 3/16

Location MEZZO60 MEZZO72

Inches Millimeters Inches Millimeters

A 74 1880 86 2184

B 63-1/8 1603 75-1/8 1908

C 15-5/8 397 15-5/8 397

D 48-1/2 1232 48-1/2 1232

E 4 102 4 102

F 8-9/16 217 8-9/16 217

G 63 1600 75 1905

H 8-9/16 217 8-9/16 217

I125125

J 70 1778 82 2083

K 17-1/8 435 17-1/8 435

Location MEZZO60 MEZZO72

Inches Millimeters Inches Millimeters

L 8 203 8 203

M 18-5/8 471 18-5/8 471

N 47-3/4 1213 47-3/4 1213

O 2-3/8 60 2-3/8 60

P 8-9/16 217 8-9/16 217

Q 24-1/2 622 24-1/2 622

R 7-1/4 184 7-1/4 184

S 8-7/8 225 8-7/8 225

T 2-3/4 70 2-3/4 70

U 23-3/4 603 23-3/4 603

V 30-1/2 775 30-1/2 775

Figure 3.2 Appliance Dimensions - MEZZO60, MEZZO72

B

A

C

D

E

F

G

H

I

J

K

M

o

N

O

P

Q

S

T

R

U

GAS ACCESS ELECTRICAL ACCESS

CENTERED ON APPLIANCE

L

V

11

Heat & Glo • MEZZO36, MEZZO36ST, MEZZO48, MEZZO48ST Installation Manual • 2300-970 Rev. T • 3/16

Figure 3.3 Appliance Dimensions - MEZZO36ST, MEZZO48ST

Location MEZZO36ST MEZZO48ST

Inches Millimeters Inches Millimeters

A 50 1270 62 1575

B 39-1/4 997 51-1/8 1299

C 15-5/8 397 15-5/8 397

D 42-1/2 1080 42-1/2 1080

E 4 102 4 102

F 8-9/16 217 8-9/16 217

G 63 1600 63 1600

H 8-9/16 217 8-9/16 217

I 1/2 13 1/2 13

J 46-3/16 1173 58 1473

K 17-1/8 435 17-1/8 435

Location MEZZO36ST MEZZO48ST

Inches Millimeters Inches Millimeters

L 8 203 8 203

M 18-1/8 460 18-1/8 460

N 41-3/4 1060 41-3/4 1060

O 2-3/8 60 2-3/8 60

P 8-9/16 217 8-9/16 217

Q 24-1/2 622 24-1/2 622

R 7-1/4 184 7-1/4 184

S 8-7/8 225 8-7/8 225

T 2-3/4 70 2-3/4 70

U 23-3/4 603 23-3/4 603

V 30-1/2 775 30-1/2 775

G

KI

M

o

O

P

Q

B

A

C

D

E

S

T

R

H

F

J

L

N

U

GAS ACCESS ELECTRICAL ACCESS

CENTERED ON APPLIANCE

V

12 Heat & Glo • MEZZO36/ST, MEZZO48/ST MEZZO60/ST, MEZZO72/ST Installation Manual • 2300-970 Rev. T • 3/16

Figure 3.4 Appliance Dimensions - MEZZO60ST, MEZZO72ST

Location MEZZO60ST MEZZO72ST

Inches Millimeters Inches Millimeters

A 74 1880 86 2184

B 63-1/8 1603 75-1/8 1908

C 15-5/8 397 15-5/8 397

D 48-1/2 1232 48-1/2 1232

E 4 102 4 102

F 8-9/16 217 8-9/16 217

G 63 1600 75 1905

H 8-9/16 217 8-9/16 217

I 1/2 13 1/2 13

J 70 1778 82 2083

K 17-1/8 435 17-1/8 435

Location MEZZO60ST MEZZO72ST

Inches Millimeters Inches Millimeters

L 8 203 8 203

M 18-1/8 460 18-1/8 460

N 47-3/4 1213 47-3/4 1213

O 2-3/8 60 2-3/8 60

P 8-9/16 217 8-9/16 217

Q 24-1/2 622 24-1/2 622

R 7-1/4 184 7-1/4 184

S 8-7/8 225 8-7/8 225

T 2-3/4 70 2-3/4 70

U 23-3/4 603 23-3/4 603

V 30-1/2 775 30-1/2 775

O

P

Q

U

KI

M

o

J

L

N

G

H

F

B

A

C

D

E

S

T

R

GAS ACCESS ELECTRICAL ACCESS

V

13

Heat & Glo • MEZZO36, MEZZO36ST, MEZZO48, MEZZO48ST Installation Manual • 2300-970 Rev. T • 3/16

Figure 3.5 Loft Forge (Overlap Fit) Decorative Front Dimensions

LOFT FORGE DECORATIVE FRONT

A

B

C

D

EF

Location MEZZO36 MEZZO48 MEZZO60

Inches Millimeters Inches Millimeters Inches Millimeters

A 26-1/4 667 26-1/4 667 26-1/4 667

B 7-1/8 181 7-1/8 181 7-1/8 181

C 36-3/4 933 48-3/4 1238 60-3/4 1543

D 42-3/4 1089 54-3/4 1391 66-3/4 1695

E 13 330 13 330 13 330

F 19 483 19 483 19 483

Note: See Section 10 for hearth, mantel

and ﬁ nishing requirements.

The Loft Forge decorative front has an installed depth of 3/4 in. (19 mm), measured from

the front of the non-combustible ﬁ nishing material to the front of the decorative front.

14 Heat & Glo • MEZZO36/ST, MEZZO48/ST MEZZO60/ST, MEZZO72/ST Installation Manual • 2300-970 Rev. T • 3/16

Figure 3.6 Quattro (Overlap Fit) Decorative Front Dimensions

QUATTRO DECORATIVE FRONT

A

BC

D

EF

G

Location MEZZO36 MEZZO48 MEZZO60

Inches Millimeters Inches Millimeters Inches Millimeters

A 27-1/4 692 27-1/4 692 27-1/4 692

B 5-7/8 149 5-7/8 149 5-7/8 149

C 36-7/16 926 48-9/16 1234 60-9/16 1538

D 45-5/8 1159 57-1/8 1451 69-1/8 1756

E 12-1/2 318 12-1/2 318 12-1/2 318

F 21-3/8 21-3/8 21-3/8 543 21-3/8 543

G 29-1/8 40-1/2 40-1/2 1028 52-1/2 1334

Note: See Section 10 for hearth, mantel

and ﬁ nishing requirements.

The Quattro decorative front has an installed depth of 2-1/8 in. (54 mm), measured from

the front of the non-combustible ﬁ nishing material to the front of the decorative front.

15

Heat & Glo • MEZZO36, MEZZO36ST, MEZZO48, MEZZO48ST Installation Manual • 2300-970 Rev. T • 3/16

Figure 3.7 Clean Face Trim Front (Inside Fit) Decorative Front Dimensions

CLEAN FACE TRIM DECORATIVE FRONT

Location MEZZO36 MEZZO48 MEZZO60 MEZZO72

Inches Millimeters Inches Millimeters Inches Millimeters Inches Millimeters

A 39 991 51 1295 63 1600 75 1905

B 16-3/4 425 16-3/4 425 16-3/4 425 16-3/4 425

C 13-1/8 333 13-1/8 333 13-1/8 333 13-1/8 333

D 37-3/16 945 49-3/16 1249 61-3/16 1554 73-3/16 1859

E 40-5/16 1024 52-5/16 1329 64-5/16 1634 76-5/16 1938

F 24 610 24 610 24 610 24 610

G 5/8 16 5/8 16 5/8 16 5/8 16

H 25 635 25 635 25 635 25 635

H

F

C

B

E

A

D

G

Note: See Section 10 for hearth, mantel

and ﬁ nishing requirements.

16 Heat & Glo • MEZZO36/ST, MEZZO48/ST MEZZO60/ST, MEZZO72/ST Installation Manual • 2300-970 Rev. T • 3/16

B. Clearances to Combustibles

When selecting a location for the appliance it is important

to consider the required clearances to walls. See Figure

3.8 and Figure 3.9.

WARNING! Risk of Fire or Burns! Provide adequate

clearance around air openings and for service access.

Due to high temperatures, the appliance should be lo-

cated out of trafﬁ c and away from furniture and draperies.

NOTICE: Illustrations reﬂ ect typical installations and are

FOR DESIGN PURPOSES ONLY. Illustrations/diagrams

are not drawn to scale. Actual installation could vary due

to individual design preference.

Figure 3.8 Appliance Locations: MEZZO Single-Sided Models

Model A B C D E F G

MEZZO36 Inches 62-1/2 48-1/4 88-1/8

See

Section

10, Figure

10.14 and

10.15.

24-1/2 18-3/4 1

Millimeters 1588 1226 2239 622 477 25

MEZZO48 Inches 70-3/4 60-1/4 100-3/8 28-1/2 18-3/4 1

Millimeters 1797 1530 2550 724 477 25

MEZZO60 Inches 79-1/2 72-1/4 112-3/8 31-3/4 18-3/4 1

Millimeters 2019 2013 2854 807 476 25

MEZZO72 Inches 88 84-1/4 124-3/8 35-1/4 18-3/4 1

Millimeters 2235 2140 3159 895 476 25

It is important to follow the framing and ﬁ nishing instruc-

tions step by step to ensure proper placement of ﬁ replace

in the surrounding framing/ﬁ nishing materials.

B

C

AB

G

B

F

E

B

G

D

Refer to Section 10 for hearth, mantel and

wall projection information.

If a HEAT-ZONE® will be installed, refer to

Section 5.E for information.

2 HEAT-ZONES = Add 28 IN. to dimension B

1 HEAT-ZONE = Add 14 IN. to dimension B

17

Heat & Glo • MEZZO36, MEZZO36ST, MEZZO48, MEZZO48ST Installation Manual • 2300-970 Rev. T • 3/16

C

B

A

D

Figure 3.9 Appliance Locations: MEZZO See-Through Models

C. Constructing the Appliance Chase

A chase is a vertical box-like structure built to enclose the

gas appliance and/or its vent system. In cooler climates

the vent should be enclosed inside the chase.

NOTICE: Treatment of ceiling ﬁ restops and wall shield

ﬁ restops and construction of the chase may vary with the

type of building. These instructions are not substitutes

for the requirements of local building codes. Therefore,

you MUST check local building codes to determine the

requirements to these steps.

Chases should be constructed in the manner of all out-

side walls of the home to prevent cold air drafting prob-

lems. The chase should not break the outside building

envelope in any manner.

Walls, ceiling, base plate and cantilever ﬂ oor of the chase

should be insulated. Vapor and air inﬁ ltration barriers

should be installed in the chase as per regional codes for

the rest of the home. Additionally, in regions where cold

air inﬁ ltration may be an issue, the inside surfaces may be

sheetrocked and taped (or an equivalent method may be

used) to achieve maximum air tightness.

NOTICE: This See-Through appliance is NOT

designed or approved for an indoor/outdoor

application.

To further prevent drafts, the wall shield and ceiling ﬁ re-

stops should be caulked with caulk with a minimum of

300ºF continuous exposure rating to seal gaps. Gas line

holes and other openings should be caulked with caulk

with a minimum of 300ºF continuous exposure rating or

stuffed with unfaced insulation. If the appliance is being

installed on a cement surface, a layer of plywood may be

placed underneath to prevent conducting cold up into the

room.

MODEL A B C D

MEZZO36ST Inches 48-1/4 17-1/8 48 1/2

Millimeters 1225 435 1219 13

MEZZO48ST Inches 60-1/4 17-1/8 48 1/2

Millimeters 1530 435 1219 13

MEZZO60ST Inches 72-1/4 17-1/8 48 1/2

Millimeters 2013 435 1219 13

MEZZO72ST Inches 84-1/4 17-1/8 48 1/2

Millimeters 2140 435 1219 13

Note: Figure 3.10 and Figure 3.11, and Figure 3.12 show the

ﬁ replace installed on the ﬂ oor. However, this ﬁ replace can be

elevated off the ﬂ oor provided that the ﬁ replace is properly

supported by framing materials and the ceiling clearances are

maintained.

18 Heat & Glo • MEZZO36/ST, MEZZO48/ST MEZZO60/ST, MEZZO72/ST Installation Manual • 2300-970 Rev. T • 3/16

B

D

A

HEADER

DEPTH**

C

APPLIANCE MAY BE INSTALLED OFF OF FLOOR***

Figure 3.10 Clearances to Combustibles-MEZZO36, MEZZO48, MEZZO60, MEZZO72

MINIMUM FRAMING DIMENSIONS*

MEZZO48

ABCDE F GHIJK

Rough

Opening

(Vent Pipe)

Rough

Opening

(Height)

Rough

Opening

(Depth)

Rough

Opening

(Width)

Clearance

to Ceiling

Combustible

Floor

Combustible

Flooring

Behind

Appliance

Sides of

Appliance

Front of

Appliance

Clearance

to Ceiling

Inches 10 42 18-1/4 60-1/4 31 0 0 1 1 48 55-1/2

Millimeters 254 1067 464 1530 787 0 0 25 25 1219 1410

J

G

I

H

E

F

K

E=MEASUREMENT FROM TOP OF

FIREPLACE OPENING

TO CEILING

K=MEASUREMENT FROM

BOTTOM OF FIREPLACE

TO CEILING

MINIMUM FRAMING DIMENSIONS*

MEZZO36

ABCDE F GHIJK

Rough

Opening

(Vent Pipe)

Rough

Opening

(Height)

Rough

Opening

(Depth)

Rough

Opening

(Width)

Clearance

to Ceiling

Combustible

Floor

Combustible

Flooring

Behind

Appliance

Sides of

Appliance

Front of

Appliance

Clearance

to Ceiling

Inches 10 42 18-1/4 48-1/4 31 0 0 1 1 48 55-1/2

Millimeters 254 1067 464 1226 787 0 0 25 25 1219 1410

MINIMUM FRAMING DIMENSIONS*

MEZZO60

ABCDE F GHIJK

Rough

Opening

(Vent Pipe)

Rough

Opening

(Height)

Rough

Opening

(Depth)

Rough

Opening

(Width)

Clearance

to Ceiling

Combustible

Floor

Combustible

Flooring

Behind

Appliance

Sides of

Appliance

Front of

Appliance

Clearance

to Ceiling

Inches 10 48 18-1/4 72-1/4 31 0 0 1 1 48 55-1/2

Millimeters 254 1219 464 1835 787 0 0 25 25 1219 1410

MINIMUM FRAMING DIMENSIONS*

MEZZO72

ABCDE F GHIJK

Rough

Opening

(Vent Pipe)

Rough

Opening

(Height)

Rough

Opening

(Depth)

Rough

Opening

(Width)

Clearance

to Ceiling

Combustible

Floor

Combustible

Flooring

Behind

Appliance

Sides of

Appliance

Front of

Appliance

Clearance

to Ceiling

Inches 10 48 18-1/4 84-1/4 31 0 0 1 1 48 55-1/2

Millimeters 254 1219 464 2140 787 0 0 25 25 1219 1410

* = Adjust framing dimensions for interior sheathing (such as sheetrock)

**= Header depth not to exceed 3-1/2 inches.

***= If appliance is installed off of ﬂ oor, maintain required clearances to combustibles.

Construct platform in accordance with local building codes.

19

Heat & Glo • MEZZO36, MEZZO36ST, MEZZO48, MEZZO48ST Installation Manual • 2300-970 Rev. T • 3/16

Figure 3.11 Clearances to Combustibles-MEZZO36ST, MEZZO48ST, MEZZO60ST, MEZZO72ST

MINIMUM FRAMING DIMENSIONS*

ABCDE F G H I J

Rough

Opening

(Vent Pipe)

Rough

Opening

(Height)

Rough

Opening

(Depth)

Rough

Opening

(Width)

Clearance

to Ceiling

Combustible

Floor

Combustible

Flooring

Sides of

Appliance

Front or

Rear of

Appliance

Clearance

to Ceiling

MEZZO36ST

in. 10 42 17 48-1/4 31 0 0 1 48 55-1/2

mm 254 1067 432 1226 787 0 0 25 1219 1410

MEZZO48ST

in. 10 42 17 60-1/4 31 0 0 1 48 55-1/2

mm 254 1067 432 1530 787 0 0 25 1219 1410

MEZZO60ST

in. 10 48 17 72-1/4 31 0 0 1 48 55-1/2

mm 254 1219 432 1835 787 0 0 25 1219 1410

MEZZO72ST

in. 10 48 17 84-1/4 31 0 0 1 48 55-1/2

mm 254 1219 432 2140 787 0 0 25 1219 1410

F

G

H

E

I

J

E=MEASUREMENT FROM TOP

OF FIREPLACE OPENING

TO CEILING J=MEASUREMENT FROM

BOTTOM OF FIREPLACE

TO CEILING

C

A

B

D

HEADER

DEPTH** HEADER

DEPTH**

APPLIANCE MAY BE

INSTALLED OFF OF FLOOR***

* = Adjust framing dimensions for interior sheathing (such as sheetrock)

**= Header depth not to exceed 3-1/2 inches.

***= If appliance is installed off of ﬂ oor, maintain required clearances to combustibles.

Construct platform in accordance with local building codes.

20 Heat & Glo • MEZZO36/ST, MEZZO48/ST MEZZO60/ST, MEZZO72/ST Installation Manual • 2300-970 Rev. T • 3/16

D. Floor Protection

NOTICE: Install appliance on hard metal or wood surfaces

extending full width and depth. DO NOT install directly

on carpeting, vinyl, tile or any combustible material other

than wood.

WARNING! Risk of Fire! Maintain speciﬁ ed air space

clearances to appliance and vent pipe:

• Insulation and other materials must be secured to prevent

accidental contact.

• The chase must be properly blocked to prevent blown

insulation or other combustibles from entering and

making contact with ﬁ replace or chimney.

• Failure to maintain airspace could cause overheating

and ﬁ re.

Figure 3.12 Floor Protection

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Heat & Glo Mezzo Series Install Manual

Heat & Glo Mezzo Series Install Manual

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