Roof Curb for
Indirect Fired
Gas Heating Products
Since the Trane Company has a policy of continuous product improvement, it reserves the right to change specifications
and design without notice. The installation and servicing of the equipment referred to in this booklet should be done by
qualified, experienced technicians.
Library Service Literature
Product Section Air Handling
Product Make-Up Air
Model GRAA
Literature Type Installation
Sequence 1
Date December 1996
File No. SV-AH-MUA-GRAA-IN-1-1296
Supersedes New
Installation GRAA-IN-1
© American Standard Company 1996
Models:
GRAA, GRBA, GRCA, GRDA, GREA, GRGA
WARNING
This manual, including the warnings and cautions inside, must be carefully read
and followed by all persons who use or maintain this product, including those who
have any responsibility involving its selection, application, service or repair. This
unit will perform as designed only if used and maintained according to the
instructions. Otherwise, it could fail to perform as designed and persons who rely
on this product could sustain serious personal injury or death.
Page Description
3 General Information
3 Receiving Instructions
3 Literature Change History
3 Warnings and Cautions
4 Arrangements B (10-80),
C (10-40), D (10-80),
E (10-40), G (20-40)
9 Arrangements C (50-80),
E (50-80), G (50-12), J (20-12),
K (10-80), L (10-80)
14 Ductwork Connection
Note: Digit 14 in the Model
Number determines the
arrangement of the unit.
Table of
Contents
Arrangement Unit Size Dimensional
Data
Roof
Opening
Roof Curb
Assembly
Curb
Spec’s.
Ductwork
Connection
B = Blower (Standard)
10-40 Page 4 Page 5 Page 6 Page 8
Page 14
50-80 Page 4 Page 5 Page 6 Page 8
C = Blower (Standard)
Plenum
10-40 Page 4 Page 5 Page 6 Page 8
50-80 Page 9 Page 10 Page 11 Page 13
D = Blower (Standard)
Evaporative Cooler
10-40 Page 4 Page 5 Page 6 Page 8
50-80 Page 4 Page 5 Page 6 Page 8
E = Blower (Standard)
Evaporative Cooler/Plenum
10-40 Page 4 Page 5 Page 6 Page 8
50-80 Page 9 Page 10 Page 11 Page 13
G = Blower (High CFM)
20-40 Page 4 Page 5 Page 6 Page 8
50-80 Page 9 Page 10 Page 11 Page 13
12 Page 9 Page 10 Page 11 Page 13
J = Blower (High CFM)
Plenum
20-40 Page 9 Page 10 Page 11 Page 13
50-80 Page 9 Page 10 Page 11 Page 13
12 Page 9 Page 10 Page 11 Page 13
K = Blower (High CFM)
Cooling
10-40 Page 9 Page 10 Page 11 Page 13
50-80 Page 9 Page 10 Page 11 Page 13
L = Blower (High CFM)
Cooling / Plenum
10-40 Page 9 Page 10 Page 11 Page 13
50-80 Page 9 Page 10 Page 11 Page 13
2 GRAA-IN-1
Attention
Read these instructions carefully
prior to installing this equipment.
Check all specifications and make
sure the appropriate equipment is
being installed.
Retain this manual for future
reference!
WARNING!
Improper installation,
adjustment, alteration, service or
maintenance can cause property
damage, injury or death. Read
the installation instructions
thoroughly before installing or
servicing this equipment.
Receiving Instructions
Inspect the shipment immediately
when received to determine if any
damage has occurred to the unit
during shipment. After the Roof
Curb has been unpacked, check
for any visible damage to the parts.
If any damage is found, the
consignee should sign the bill of
lading indicating such damage and
immediately file claim for the
damage with the transportation
company.
Literature Change History
GRAA-IN-1 (December 1996)
Original installation manual for roof
curb.
Warnings and Cautions
Warnings and cautions appear at
appropriate intervals throughout
this manual.
Warnings!
alert the equipment rigger,
owner/operator and service
personnel to potential hazards
that could result in personal
injury or death.
Cautions:
are provided to alert personnel
to conditions that may result in
equipment or property damage.
General
Information
GRAA-IN-1 3
Roof Curbs for arrangements D
and E include an evaporative
cooler platform. See GRAA-IN-2.
Roof Curbs ship knocked down for
ease of handling and storage. The
field assembly and mounting of the
curb to the roof is the responsibility
of the installer. All curbs ship
complete with pre-assembled side
and end rails, cross member
supports, ductwork connector
brackets, hardware, optional
insulation and gasketing. See
Figures 3, 17, and 18 for a
complete parts list for your curb.
Check to see that all components
are included. Refer to Figures 3, 4,
5, 6, 17, and 18 to see if all other
field supplied parts are also on
hand.
Provide a suitable opening, or two
openings, in the roof as suggested
per Figures 2 & 4. These return
and/or supply air ductwork open-
ings have been calculated to in-
clude a one inch clearance on
each side of the ductwork. The in-
staller may determine other open-
ing(s) to accept return and/or
supply air ducts to suit particular
needs.
Figure 1 - Dimensions
Capacity W+ B+
10,15 26-7/16 (672) 30-3/16 (767)
20,25,50 37-7/16 (951) 41-3/16 (1046)
30,35,60,70 48-7/16 (1230) 52-3/16 (605)
40,80 53-15/16 (1370) 57-11/16 (1465)
Approximate Roof Curb Weights
* R A Capacity 10,15 20,25,50 30,35,60,70 40,80
B 10 thru 40 115 133 151 161
D 10 thru 40 145 163 181 191
B
C
50 thru 80
10 thru 40
150 168 186 196
D
E
50 thru 80
10 thru 40
180 198 216 226
G 20 thru 40 NA 179 197 207
* R A Capacity F+ H+ J+
B 10 thru 40
29-5/8
(752)
71-1/8
(1807)
67-3/8
(1711)
D 10 thru 40
29-5/8
(752)
71-1/8
(1807)
67-3/8
(1711)
B
C
50 thru 80
10 thru 40
29-5/8
(752)
97-1/8
(2467)
93-3/8
(2372)
D
E
50 thru 80
10 thru 40
29-5/8
(752)
97-1/8
(2467)
93-3/8
(2372)
G 20 thru 40
37-3/16
(945)
107-5/16
(2726)
103-9/16
(2630)
Notes:
* RA = Rooftop Arrangement
+ Dimensions are in inches.
(Dimensions in parenthesis are in millimeters.)
1 lb. = 0.453 kg
NA = Not Applicable
Dimensional Data
Arrangement Capacity
B 10-80
C 10-40
D 10-80
E 10-40
G 20-40
4 GRAA-IN-1
WARNING!
To avoid any property damage
or personal injury, it is the
installer’s responsibility to make
sure that the installation will not
impair the function of this curb,
or the unit to be installed.
All curbs must be mounted on level
areas. The roof must be suitable
to support the weight of both the
curb and the unit to be mounted.
The enclosed area of the roof curb
must comply to required
clearances to combustible
materials. If the roof construction
is made of combustible materials,
the enclosed roof curb area must
meet the following requirements:
1. Ventilate this area.
2. Leave area open (however, this
may elevate higher sound
levels).
3. Cover this area with
non-combustible material,
which utilizes an “R” value of
5.0 minimum.
Position and assemble the curb,
referring to Figures 1 thru 8, 17 and
18 and the following procedure:
1. All hardware used for these
assembly procedures is
included with your curb, and
should be used. Do not tighten
any hardware until the curb is
completely level and square,
and installed in a suitable
position on the roof, with proper
alignment to the roof/unit
opening(s).
2. Position and install the end and
side curb rail sub-assemblies,
aligning around the roof
opening location(s).
3. Position and install the inner
cross brace(s) and ductwork
brackets as shown.
4. Secure the roof curb to the roof
decking.
5. Install the field supplied
flashing/ materials.
6. Apply the gasketing (included
with the kit) on the top flanges/
surfaces of the curb as shown.
WARNING!
To avoid any property damage
or personal injury, it is the
installer’s responsibility that the
roof curb and unit must be
completely sealed, preventing
any water or air leakage/damage.
* Dimension “A” applies to the distance between roof openings
(only on units with a supply plenum: also refer to Figure 4).
Refer to Figure 4 for Section X-X and Y-Y details.
RA* = Rooftop Arrangement
Figure 2 - Roof Opening Specifications
Capacity
Dimension
E * (mm)
10/15
26"
(660)
20/25/50
37"
(940)
30/35/60/70
48"
(1219)
40/80
53-1/2"
(1359)
Supply
Air
Opening
Return
Air
Opening
E*
A*
Section
Y-Y
Section
X-X
20-7/8"
(530mm)
20-7/8"
(530mm)
RA * Capacity A ** (mm)
C 10 thru 40 50-7/8 " (1292)
E 10 thru 40 50-7/8" (1292)
Note: All roof opening dimensions shown have been calculated to
include one inch (25mm) clearance on each side of the ductwork
openings.
GRAA-IN-1 5
Figure 3 - Roof Curb Assembly *
* The roof curb and destined unit must be sealed completely to prevent any water or air leakages (also see Figure 8).
Refer to Figures 17 and 18 for Ductwork Mounting Bracket Assembly.
1 Curb Rail Assembly—Side
2 Curb Rail Assembly—End
3 Cross Brace—Curb
4
Bolt—3/8-16 x 1" LG. Hex Hd.
(8) Req’d.
5
3/8-16 x 1" LG. Hex Nyloc Nut
(8) Req’d.
6
1/4-14 x 5/8 LG. Hex Washer
Hd. Sheet Metal Screw Type
“AB” (8) Req’d.
7
Screw—#10 x 5/8" LG. Pan
Hd. Type “AB” (8) Req’d.
8 Gasket
6 GRAA-IN-1
Figure 4 - Roof Curb Application (Also refer to Figures 2, 5 and 6)
Section X - X
Section Y - Y
Figure 5 - Detail D
RA* Capacity B+
C, E 10 thru 40
18-7/8
(479)
C, E 50 thru 80
19-3/8
(492)
Figure 6 - Detail E
Notes:
RA* = Rooftop Arrangement
+ Dimensions are in inches.
(Dimensions in parenthesis are in millimeters.)
1 lb. = 0.453 kg
NA = Not Applicable
GRAA-IN-1 7
Figure 8 - Unit/Curb Rail Assembly
Figure 7 - Curb Specifications
For Field Installations: These
Cross Brace/Curb Adapters (two
adapters ship with each rooftop
unit) must be repositioned when
the unit is mounted on a curb or
platform (one for each end). Simply
remove the screws, turn the piece
over (end for end) and secure in
place using the holes/hardware
provided. All joints and seams
must be sealed completely to
prevent leaks.
8 GRAA-IN-1
Roof Curbs for arrangements D
and E include an evaporative
cooler platform. See GRAA-IN-2.
Roof Curbs ship knocked down for
ease of handling and storage. The
field assembly and mounting of the
curb to the roof is the responsibility
of the installer. All curbs ship
complete with pre-assembled side
and end rails, cross member
supports, ductwork connector
brackets, hardware, insulation and
gasketing. See Figures 11, 17, and
18 for a complete parts list for your
curb. Check to see that all
components are included. Refer to
Figures 11 thru 18 to see if all
other field supplied parts are also
on hand.
Provide a suitable opening, or two
openings, in the roof as suggested
per Figures 10 and 12. These
return and/or supply air ductwork
openings have been calculated to
include a one inch clearance on
each side of the ductwork. The
installer may determine other
opening(s) to accept return and/or
supply air ducts to suit particular
needs.
Figure 9 - Dimensions
Capacity W+ B+
10,15 26-7/16 (672) 30-3/16 (767)
20,25,50 37-7/16 (951) 41-3/16 (1046)
30,35,60,70 48-7/16 (1230) 52-3/16 (605)
40,80,12 53-15/16 (1370) 57-11/16 (1465)
Approximate Roof Curb Weights
RA* Capacity 10,15 20,25,50 30,35,60,70 40,80,12
G
J
K
50 thru 80
20 thru 40
10 thru 40
192 210 228 238
C 50 thru 80 NA 197 217 227
E 50 thru 80 NA 227 247 257
G
J & K
L
12
50 thru 80
10 thru 40
310 338 366 381
J
L
12
50 thru 80
NA 375 403 418
RA* Capacity F+ H+ J+
G
J
K
50 thru 80
20 thru 40
10 thru 40
37-1/8
(943)
133-1/4
(3385)
129-1/2
(3289)
C
50 thru 80
30-7/8
(765)
123
(3124)
119-1/4
(3029)
E
G
J & K
L
12
50 thru 80
10 thru 40
37-5/16
(948)
159-5/16
(4046)
155-9/16
(3951)
J
L
12
50 thru 80
36-15/16
(938)
185-5/16
(4707)
181-9/16
(4612)
Notes:
RA* = Rooftop Arrangement
+ Dimensions are in inches.
(Dimensions in parenthesis are in millimeters.)
1 lb. = 0.453 kg
NA = Not Applicable
Dimensional Data
Arrangement Capacity
C 50-80
E 50-80
G 50-12
J 20-12
K 10-80
L 10-80
GRAA-IN-1 9
WARNING!
Improper installation,
adjustment, alteration, service or
maintenance can cause property
damage, injury or death. Read
the installation instructions
thoroughly before installing or
servicing this equipment.
WARNING!
To avoid any property damage
or personal injury, it is the
installer’s responsibility to make
sure that the installation will not
impair the function of this curb,
or the unit to be installed.
All curbs must be mounted on level
areas. The roof must be suitable
to support the weight of both the
curb and the unit to be mounted.
The enclosed area of the roof curb
must comply to required
clearances to combustible
materials. If the roof construction
is made of combustible materials,
the enclosed roof curb area must
meet the following requirements:
1. Ventilate this area;
2. Leave area open (however, this
may elevate higher sound
levels);
3. Cover this area with
non-combustible material,
which utilizes an “R” value of
5.0 minimum.
Position and assemble the curb,
referring to Figures 9 through 18,
and the following procedure:
1. All hardware used for these
assembly procedures is
included with your curb, and
should be used. Do not tighten
any hardware until the curb is
completely level and square,
and installed in a suitable
position on the roof, with proper
alignment to the roof/unit
opening(s).
2. Position and install the end and
side curb rail sub-assemblies,
aligning around the roof
opening location(s).
3. Position and install the inner
cross brace(s) and ductwork
brackets as shown.
4. Secure the roof curb to the roof
decking.
5. Install the field supplied
flashing/ materials.
6. Apply the gasketing (included
with the kit) on the top
flanges/surfaces of the curb as
shown.
WARNING!
To avoid any property damage
or personal injury, it is the
installer’s responsibility that the
roof curb and unit must be
completely sealed, preventing
any water or air leakage/damage.
* RA = Rooftop Arrangement
** Dimension “A” applies to the distance between
roof openings (only on units with a supply
plenum: also refer to Figure 12).
Refer to Figure 12 for Section X-X and Y-Y
details.
Figure 10 - Roof Opening
Specifications
Capacity
Dimension
E * (mm)
10/15
26"
(660)
20/25/50
37"
(940)
30/35/60/70
48"
(1219)
40/80/12
53-1/2"
(1359)
* All roof opening dimensions shown have
been calculated to include a one inch
clearance on each side of the ductwork
opening.
Supply
Air
Opening
Return
Air
Opening
E*
A*
Section
Y-Y
Section
X-X
20-7/8"
(530mm)
20-7/8"
(530mm)
RA * Capacity A ** (mm)
J 20 thru 40
87-1/16 "
(2211)
C & E 50 thru 80 76-7/8" (1952)
J
L
50 thru 80
10 thru 40
113"
(2871)
J
L
12
50 thru 80
139"
(3531)
10 GRAA-IN-1
Figure 11 - Roof Curb Assembly *
* The roof curb and destined unit must be sealed completely to
prevent any water or air leakages (also see Figure 16).
Refer to Figures 17 and 18 for Ductwork Mounting Bracket
Assembly.
1 Curb Rail Assembly—Side (L.H.)
2 Curb Rail Assembly—Side (R.H.)
3 Curb Rail Assembly—End
4 Cross Brace—Curb
5 Connector—Curb
6
Bolt—3/8-16 x 1" LG. Hex Hd.
(16) Req’d.
7
3/8-16 x 1" LG. Hex Nyloc Nut
(16) Req’d.
8
1/4-14 x 5/8 LG. Hex Washer
Hd. Sheet Metal Screw Type
“AB” (8) Req’d.
9
Screw—#10 x 5/8" LG. Pan Hd.
Type “AB” (8) Req’d.
10 Gasket
GRAA-IN-1 11
Figure 12 - Roof Curb Application (Also refer to Figures 10, 13 and 14)
Section Y - Y
Section X - X
Figure 13 - Detail D
Figure 14 - Detail E
RA* Capacity B+
C, E 50 thru 80
19-3/8
(492)
J
L
12
50 thru 80
18-7/8
(479)
J 20 thru 40
19-1/8
(486)
J
L
50 thru 80
10 thru 40
19-1/4
(489)
Notes:
RA* = Rooftop Arrangement
+ Dimensions are in inches.
(Dimensions in parenthesis are in millimeters.)
1 lb. = 0.453 kg
NA = Not Applicable
12 GRAA-IN-1
Figure 16 - Unit/Curb Rail Assembly
Figure 15 - Curb Specifications
For Field Installations: These
Cross Brace/Curb Adapters (two
adapters ship with each rooftop
unit) must be repositioned when the
unit is mounted on a curb or
platform (one for each end). Simply
remove the screws, turn the piece
over (end for end) and secure in
place using the holes/hardware
provided. All joints and seams
must be sealed completely to
prevent leaks.
GRAA-IN-1 13
Figure 18 - Supply Air Ductwork Mounting Bracket Assembly
Figure 17 - Return Air Ductwork Mounting Bracket Assembly
Ductwork Connections
1 Curb Cross Brace Channel
2 Curb Side Rail Channel
3 Curb End Rail Channel
4
Screw—#10 x 5/8" LG. Pan
Hd. Type “AB” (8) Req’d.
1 Roof Mounting Angle
2 Curb End Rail Channel
3
Screw—#10 x 5/8" LG. Pan Hd.
Type “AB” (8) Req’d.
4 Fasteners by Others (“B”) Req’d
RA* Capacity A+
C, E 10 thru 40
18-7/8
(479)
C, E 50 thru 80
19-3/8
(492)
J
L
12
50 thru 80
18-7/8
(479)
J 20 thru 40
19-1/8
(486)
J
L
50 thru 80
10 thru 40
19-1/4
(489)
Notes:
RA* = Rooftop Arrangement
+ Dimensions are in inches.
(Dimensions in parenthesis are in
millimeters.)
1 lb. = 0.453 kg
NA = Not Applicable
14 GRAA-IN-1
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3
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4
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5
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7
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9
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