Euroheat Stanford 25 Technical Manual

1

Balanced Flue Stove

Technical Guide

Document No: IN1105

2

Hearth and Fireplace Requirements

Do not be tempted to ﬁt the stove into an unsuitable ﬁreplace. Beyond the requirements

of the building regulations and access to facilitate servicing the stove, providing a

setting which will complement the stove is not a luxury, it is the practicality of making

the most of an investment. A good builder will be able to transform even the most

utilitarian of ﬁreplaces, whether altering its proportions to those of the “Golden Mean”

ideal, exposing a wooden lintel, stone or simply removing superﬂuous detailing for

comparatively small costs, and the result will be a pleasure for many years.

Minimum clearance

from combustible

materials

Minimum clearance

from non

combustible

materials

A 12" 300mm** 9" 230mm

B 6" 150mm** 4" 100mm

C 1" 25mm** N/A

D 2" 50mm** 2" 50mm

E 6" 150mm** 4" 100mm

F

12mm of non

combustable material.

12mm of non

combustable material.

Curtains and furnishings should be a minimum of

1m from the stove.

The stove can be placed on a combustible

ﬂoor providing it can support the weight,

and providing a non combustible hearth

plinth with a minimum thickness of

12mm is utilized.

** The measurements provided are

for guidance only.

In all installations any surrounding

ﬂammable materials must not be allowed

to exceed 80°C or a non combustible

shield provided in accordance with

current regulations. The stove must

always stand perfectly level and have

sufﬁcient space allowing for service

work.

A

B

D

C

E

F

1/3 2/3

“Golden Mean”

Side Prole

1

2/3

“Golden Mean”

Front View

3

Balanced Flue Systems

A balanced ﬂue system utilizes a double concentric pipe, the inner one taking away the products of combustion

and the outer one bringing the air supply to the stove. This system allows a gas stove to be installed where no

ﬂue exists, and because the ﬂue needs very little vertical height to operate, it is often possible to route the ﬂue

through the room wall to the outside.

With all the air necessary for combustion being supplied through the outer pipe directly from the outside, the

room in which the stove is installed needs no ventilation speciﬁcally for the stove.

The balanced ﬂue system has been designed to give a huge range of installation options, terminating either

horizontally or vertically, as illustrated in the diagram below.

Deciding on which form the balanced ﬂue should take will very much be constrained by the termination of the

ﬂue. Building Regulations lay out deﬁnitive guide lines for where a ﬂue can terminate, see the diagram later in

this document, and if the building is listed there may be constraints on the position of any terminal and advice

should be sort from the appropriate regulatory authority.

4

No Chimney ----- No Problem

This document will help you design and your qualiﬁed engineer install a suitable balanced ﬂue system for your

stove. Following the simple guide lines will allow a balanced ﬂued stove to be ﬁtted in most situations where

a conventionally ﬂued stove could not be ﬁtted.

Top to Vertical High Level Flue Kit

The vertical balanced ﬂue system is ideal in situations such as in a newly constructed

conservatory where there are no walls through which to pass a horizontal ﬂue. The ﬂue will

rise from the stove vertically passing through the roof where it will then terminate with a

vertical terminal.

Minimum height 2m maximum 30m.

Top to Horizontal High Level Flue Kit

It is not necessary for the stove to be situated against the outside wall through which the

ﬂue will pass, as the versatility of the balanced ﬂue system can allow for considerable

lengths of horizontal run of the ﬂue.

Rear to Horizontal Low Level

The low level horizontal kit is probably the simplest method of installation and allows

you to ﬁt the stove against any suitable outside wall in any room in your property.

Maximum horizontal length 440mm, minimum length 310mm.

Existing Chimney Adapter Kit

The ﬂue kits are also designed to be able to utilize an existing chimney. Properties

which are designed with a high thermal efﬁciency may not allow an air brick

to be ﬁtted to supply air to a stove over 7kW input, the balanced ﬂue stove

overcomes this requirement as it is a sealed appliance.

In some cases the top section of a chimney may have been removed and the

versatility of the balanced ﬂue system allows you to use what remains of the

chimney using the chimney adapter kit.

5

Location of Outlets from Flues Serving Gas Balanced Flue Stoves.

)

Minimum Separation Distances for Terminals in mm

Location Balanced Flue

A Below an opening Appliance

rated heat

input

0-7kw

>7-14kw

> 14-32kw

>32

300

600

1500

2000

B Above an opening (1) 0-32kw

>32kw

300

600

C Horizontally to an opening (1) 0-7kw

>7-14kw

>14kw

300

400

600

D Below gutters, soil pipes or drain

pipes

300

E Below eaves

300

F Below balcony or car port roof

600

G From a vertical drain pipe or soil

pipe

300

Minimum Separation Distances for Terminals in mm

Location Balanced Flue

H From an internal or external corner

or to a boundry alongside the

terminal

600

I Above ground,roof or balcony level 300

J From a surface or a boundary facing the

terminal

600

K From a terminal facing the terminal 600

L From an opening in the car port into the

building

1200

M Vertically from a terminal on the same

wall

1200

N Horizontally from a terminal on the

same wall

300

P From a structure on the roof

1500

Q Above the highest point of

intersection with the roof

600

R Flue should not penetrate shaded area 600

S Flue should not penetrate shaded area

200

Note (1)

An opening means an openable element, such as an openable window, or a ﬁxed opening such as an air

vent. However, in addition, the outlet should not be nearer than 300mm to an opening into the building fabric

formed for the purpose of accommodating a built in element, such as a window frame.

Calculating Flue Aspect Ratios

The stove operates correctly only with air ﬂow induced by the ﬂue system being within the deﬁned parameters.

To achieve these, the vertical elements of the ﬂue, which induce ﬂue draught and increase the air supply to the

stove, must be balanced against the horizontal elements of the ﬂue, which offer resistance to ﬂue draught and

reduce the air supply to the stove.

The ratio of vertical to horizontal lengths must be calculated to ensure the correct ﬂue draught will be induced

by the proposed ﬂue.

The difference in height between the top of the stove and the bottom of the terminal determines the vertical

height to be used in the calculation. The ﬂue run may necessitate the vertical elements to be separated by

several horizontal runs, this is not important, only the total height gain is needed.

The horizontal length is often more tedious to determine, but again, it is the total length which needs to be

determined, regardless of their being continuous or in stages. Any 90 degree change of direction within the

ﬂue will offer resistance to ﬂue draught and each change of direction will offer the same resistance to the ﬂue

draught as a horizontal run of 1000mm. For every 45 degree change in direction the resistance is that of a

horizontal run of 500mm.

0

0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 7.0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

4.5

5.0

5.5

6.0

BALANCED FLUE ASPECT RATIO DYNAMICS ILLUSTRATED

For 1m vertical rise a flue may have a maximum horizontal run of 7m.

For each 90 degree bend introduced the horizontal run must be reduced by 1m.

For each 45 degree bend introduced the horizontal run must be reduced by 500mm.

.5m vertical = 3.5m horizontal max.

1m vertical = 7m horizontal max.

Depending on

which direction your

ﬂue conﬁguration

will take and the

model of the stove,

a ﬂue reduction

plate (FRP) may

or may not be

required.

See pages 24 & 25

for details.

6

0

0.5

1.0

0

0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0

0.5

1.0

1.5

For a 1m vertical rise a flue can have a maximum of 7m horizontal length.

Each additional 90 degree bend creates a draught resistance equal to 1m

of horizontal length.

Therefore in example 'B' the introduction of 2 x 90 degree bends,

in a horizontal plain, reduces the maximum horizontal length by 2m.

Example 'A'

Example 'B'

Example 'C'

0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 7.0

0

Min 310mm/ Max 440mm

The rear exit flue may have a maximum horizontal run of 440mm

from the flue spigot, the minimum length 310mm.

Flue spigot

Basic Principle of Balanced Flue Ratios Illustrated

7

Top to Horizontal High Level

Rear to Horizontal Low Level

8

Example 1: Top to Horizontal High Level Kit

Using the standard top to horizontal high level ﬂue kit only.

Standard kit starter

length T1

Standard kit

terminal length T2

Sleeve kit

(accessory)

Ceramic rope or

Fraxll sealant to

prevent draughts

Standard kit 90

degree long bend

Minimum

50mm

Cavity wall

12mm

Solid wall

MM

Description Part No.

Top to

HorizontalHigh

Level Kit

150mm 180mm

MS91102 MS91103

Sleeve liner MS91065 MS91066

Terminal

guard

FP767 FP767

Closure bezel MS91033 MS91040

Components used

Closure

bezel

Terminal guard

(accessory)

The closure

bezel ﬁts around

the ﬂue pipe

covering the

hole through

a solid wall

giving the

installation

a clean ﬁnish

both inside and

outside.

9

Example 2: Top to Horizontal High Level Kit

Taking the attached diagram as an example we can calculate the ﬂue parameters for a top to horizontal ﬂue

system.

Total Height = A

Total Horizontal = B

In this example

A = 2.8 Metres B = 1.75 Metres

Three x 90 degree bends have been used one of which (C) is the standard supply kit bend. This bend is ignored

from the calculation as it is presumed it will always be used. The two remaining 90 degree bends increase the

horizontal length by two metres.

(one metre extra horizontal length per additional 90 degree bend).

Total Height A = 2.8 Metres

Total Horizontal B = 1.0 Metres

In this example there is sufﬁcient vertical rise for the horizontal run, as shown in the graph on page 6.

Standard kit

terminal length

T2

Standard kit

long 90

O

bend

Accessory 250mm

length within wall

Accessory short

90

O

bend

Accessory short

90

O

bend

Accessory

500mm length

Standard kit

starter length

T1

Accessory 1metre length

Wall band

B

B+B= Total Horizontal

AA Total height

Description Part No. Quantity

Top to

HorizontalHigh

Level Kit

150mm 180mm

1

MS91102 MS91103

1 metre length MS91028 MS91034 1

500mm length MS91029 MS91035 2

250mm length MS91030 MS91036 1

90° short bend MS91031 MS91037 2

Wall band MS91052 MS91053 1

Components used

10

Example 3: Top to Vertical High Level Kit

The ratio of vertical to horizontal lengths must be calculated to ensure the correct ﬂue draught will be induced

by the proposed ﬂue. Taking the ratio diagram as an example we can calculate the ﬂue parameters for a top

to vertical ﬂue system.

Total Height = A

Total Horizontal = B

In this example

A = 3.5 Metres B = 1.5 Metres

Two x 90deg bends have been used. The two 90 degree bends increase the horizontal length by two metres.

(One metre extra horizontal length per additional 90 degree bend).

Total height A = 3.5 Metres

Total Horizontal B =0.9 Metres

In this example there is sufﬁcient vertical rise for the horizontal run, as shown in the illustration on page 6.

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Description Part No. Quantity

Top to Vertical

High Level Kit

150mm 180mm

1

MS91100 MS91101

1 metre length MS91028 MS91034 1

500mm length MS91029 MS91035 3

90° short bend MS91031 MS91037 2

Wall band MS91052 MS91053 2

Components used

(accessory)

11

Example 4: Top to Vertical High Level Kit

This example incorporates two 45 degree bends, a situation commonly encountered when having to route ﬂue

pipe around an obstacle such as a beam. When calculating the horizontal run the 45 degree bends equate to

an additional 500mm per bend.

Taking the ratio diagram as an example we can calculate the ﬂue parameters for a top to vertical ﬂue system.

Total Height = A

Total Horizontal = B

In this example

A = 4.5 Metres B = 1.5 Metres

2 x 45deg bends have been used. The two 45 degree bends increase the horizontal length by one metre.

(500mm extra horizontal length per 45 degree bend).

Total height A = 4.5 Metres

Total Horizontal B = 2.0 Metres

In this example there is sufﬁcient vertical rise for the horizontal run, as shown in the illustration on page 6.

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Description Part No. Quantity

Top to Vertical

High Level Kit

150mm 180mm

1

MS91100 MS91101

1 metre length MS91028 MS91034 5

Adjustable

length

MS91045 MS91046 1

45° short bend MS91054 MS91055 2

Wall band MS91052 MS91053 5

Roof ﬂashing MS91063 MS91063 1

Components used

(accessory)

12

Example 5: Top to Vertical High Level Kit

The minimum vertical height for a top to vertical ﬂue is two meters of ﬂue and the top to vertical kit

components.

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Description Part No. Quantity

Top to Vertical

High Level Kit

150mm 180mm

1

MS91100 MS91101

1 metre length MS91028 MS91034 2

Wall band MS91052 MS91053 2

Roof ﬂashing MS91063 MS91063 1

Components used

(accessory)

13

Example 6: Through Ceilings and Roof Spaces

Fitting a Top to Vertical High Level Flue Kit Through Ceilings and Roof Spaces

When installing balanced ﬂue pipe through a ceiling the use of a ceiling support and ﬁre stop spacer are

recommended. There should be no ﬂue joints at any point as the ﬂue passes through a ceiling.

There should a minimum clearance of 25mm from the ﬂue pipe to any combustible material.

Fire stop spacer

Ceiling support

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Weight of ﬂue

supported here.

Weight of ﬂue

supported here.

No ﬂue joints

between ﬁre

stop spacer

and ceiling

support.

Roof ashing

Description 150mm 180mm

Ceiling support MS91056 MS91057

Fire stop spacer MS91058 MS91059

Roof ﬂashing MS91063 MS91063

Wall band MS91052 MS91053

Components used

(accessory)

14

Example 7: Existing Chimney Adapter Kit Vertical Termination

Fitting an Existing Chimney Adapter Kit in Conjunction with a High Level Vertical Kit

There are great advantages in converting an existing chimney into a balanced ﬂue. The existing chimney

adapter kit can convert either ceramic lined chimneys or an unlined chimney into a balanced ﬂue system. By

using this system combustion air is drawn from the outside rather than from the property greatly increasing

overall efﬁciency.

In addittion many houses chimney stacks have been removed and the

roof tiled over. They are usually capped off at attic ﬂoor level.

We have developed a kit which can bring these chimneys back to life

using a gas balanced ﬂue stove.

It can also be used in modern properties which have heat

replacement systems where normal ventilation requirements

cannot be applied.

The system requires the use of two ﬂexible ﬂue liners, one to run

inside the other mimicking the standard balanced ﬂue pipe.

The inside pipe is for the evacuation of the products of

combustion and the outer is the air supply for combustion.

It is imperative that all the joints are sealed

to make them air tight.

There follows two examples of the system,

one is showing an existing chimney breast

and the system terminating in a

vertical position (through the roof).

The second is showing the

system terminating in a horizontal

position (through a gable end of

a property perhaps).

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Using two sizes of ﬂue liner to

mimic the balanced ﬂue pipe.

Ensure the seal is tight

to the adapter kit

Depending on which direction your ﬂue conﬁguration will take and the model of the stove, a reduction plate

may or may not be required. See pages 24 & 25 for details.

Flue system

size

Inner liner Outer liner

150mm 101mm / 4” 153mm / 6”

180mm 125mm / 5“ 178mm / 7”

Existing chimney

top adapter

Existing chimney

bottom adapter

15

Example 8: Existing Chimney Adapter Kit Horizontal Termination

Fitting an Existing Chimney Adapter Kit in Conjunction with a Top to Horizontal Kit

Clay

liner

Flexible

liner

The example above is showing an existing chimney adapter kit utilizing a existing clay liner, using a ﬂexible

liner to run inside the clay liner in order to expel the products of combustion but using the clay liner for the

feed of combustion air. Ensure that the seals between ﬂexible liner and the adapter are sound and the seal

between the clay liner and the adapter are also sound.

It can go through the long 90° bend (in the top to horizontal kit) and terminate through the gable end of the

property.

75mm

95mm

350mm

100mm

75mm

350mm

Existing chimney bottom adapter

Existing chimney top adapter

Existing chimney bottom adapter

Standard kit

90° long bend

If this orientation is to be used then the standard 90 degree long bend from the top to horizontal kit MUST be

used so that the last union before the terminal length T2 is a female (F) end.

Flue system

size

Inner liner Outer liner

150mm 101mm / 4” 153mm / 6”

180mm 125mm / 5“ 178mm / 7”

Accessory 1

metre length

Standard kit

terminal length

T2

Standard kit

starter length

T1

M

F

T2

T1

16

Example 9: Through a Combustible Roof

Installation of Top to Vertical High Level Balanced Flue Pipe Through a Combustible Roof

A 25mm gap of non combustible material must be used when you are passing the balanced ﬂue pipe through

any combustible material.

Conservatories can “come alive” with the installation of a stove, but care should be taken when installing a

stove into a conservatory because the modern ones can be made entirely from plastic (or PVC). Advise from

your conservatory installer/manufacturer should be sought.

The ﬂue system should be supported.

600mm

17

Frequently Asked Questions

Q. Can the stove be ﬂued directly off the back?

A. Yes, using the standard low level horizontal kit.

Q. Can I use a bend directly off the top of the stove?

A. No, the stove adapter is only designed to ﬁt the telescopic starter length and straight lengths, bends will not

seal to the ﬂue outlet.

Q. Can I ﬁt the stove in the corner of a room?

A. Yes, there is no problem in doing this using the top to horizontal ﬂue kit, but it must be remembered that if

the corner is also the corner of the property that the termination must be 600mm from any corner. See diagram

page 5.

Q. Can the vertical ﬂue be passed through a combustible roof, such as a polycarbonate roof in a conservatory?

A. Yes, as long as allowances are made for the type of rooﬁng material and suitable insulation is provided. See

the section on ﬂueing through a combustible roof.

Q. Can the stove be ﬁtted into a bedroom?

A. Yes, the stoves are room sealed and below 14kW input.

Q. Can I cut the lengths of ﬂue pipe?

A. Yes, however the differential between the inner and outer length has to be maintained. It would be preferable

to use an adjustable length

Q. Does the ﬂue terminal need to be guarded?

A. If the ﬂue terminal is to be sited less than two meters above level ground,

a balcony or a ﬂat roof where people have access, a guard must be ﬁtted. Local

by-laws may also require a further minimum height where the terminal is sited

adjoining a public footpath.

Q. If I have a high level horizontal kit can I then terminate it vertically?

A. Yes, there is a vertical terminal with a crimped end which will ﬁt to the

ﬂue system.

Q. Do I need an air brick or other ventilation for supplying free air to the

stove?

A. No, the stove is room sealed and does not have any requirement for free

air.

Q. Does it matter how far out of the wall the terminal is ﬁtted on a horizontal ﬂue kit?

A. Yes, there should be 12mm of ﬂue pipe visible before the start of the ﬂue terminal. Any greater length can

upset the balanced ﬂues operation.

Q. What colours are the ﬂue pipe available in?

A. The ﬂue pipe is supplied in one colour, a matt grey ﬁnish, which closely matches the cast ﬁnished stoves and

complements the enamel ﬁnished stove. It is possible to change the colour using heat resistant paint.

Q. To what wind speed are the terminals tested to?

A. The maximum wind used is 12.5 m/s with 10% error. (28mph).

Q. What is the maximum length the ﬂue can travel horizontaly from the rear outlet of the stove?

A. The standard low level horizontal ﬂue kit gives a maximum extension of 440mm. No additional lengths or

bends should be ﬁtted.

Vertical terminal with

crimped end

Size Part No:

150mm MS91047

180MM MS91048

18

Components of Top to Horizontal High Level Kit

150mm kit MS91102

180mm kit MS91103

This is a high level horizontal ﬂue kit. Other sections may be added to achieve the desired termination. For

additional lengths and accessories see pages 21 to 23.

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T2

Telescopic terminal length

(T2)

90° Long bend

Clamp band

T1

Telescopic starter length (T1)

which must be used as the

ﬁrst length of ﬂue pipe from

the stoves ﬂue collar

Dimensions of standard 150mm ﬂue kit

Max 555mm

Min 445mm

T1

T2

Max: 555mm

Min: 470mm

12mm

The min can be reduced further by cutting 40mm

off the T2 section

The min can be reduced

further by cutting 40mm

off the T1 section

Dimensions of standard 180mm ﬂue kit

19

Components of Top to Vertical High Level Kit

150mm kit MS91100

180mm kit MS91101

This kit is used when the installation requires the termination to be through a roof. Further components will

be required with this kit. For additional lengths and accessories see pages 21 to 24.

Locking Band

Vertical Terminal

Adjustable Starter Pipe

250mm

200mm

T1

Toatal length Minimum Length

for Calculations

Maximum Length

For Calculations

250mm 30mm 170mm

Adjustable Starter Pipe

20

Components of Rear to Horizontal Low Level Kit

150mm kit MS91097

180mm kit MS91098

Only the standard kit may be used, additional bends and lengths MUST not be used as they will adversely

effect the performance of the balanced ﬂue and could be dangerous.

Telescopic Module

(horizontal adjustable)

Horizontal

Terminal

Terminal Guard

Minimum

Length 310 mm

Maximum

Length 440 mm

Wind shield

T1

Spacers and self tapping

screws for wind shield

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