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Roof Curb Mounting
Rooftop units require curbs to be mounted first. The
duct connections must be located so they will be clear
of structural members of the building.
1. Factory Supplied Roof Curbs: Roof curbs are
Model GKD. The GKD ships in a knockdown kit
(includes duct adapter) and requires field assembly
(by others). Assembly instructions are included.
2. Install Curb: Locate curb over roof opening and
fasten in place. (Refer to Recommended Roof
Openings). Check that the diagonal dimensions
are within ±1/8 inch of each other and adjust as
necessary. For proper unit operation, it is important
that the installation be level. Shim as required to
level.
3. Install Ductwork: Installation of all ducts should
be done in accordance with SMACNA and AMCA
guidelines. Duct adapter provided to support ducts
prior to setting the unit.
4. Set the Unit: Lift unit to a point directly above the
curb and duct openings. Guide unit while lowering
to align with duct openings. Roof curbs fit inside
the unit base. Make sure the unit is properly seated
on the curb and is level.
5. Fasten the Unit: Fasten the unit to the curb/
equipment support(s) using appropriate methods.
The installer is responsible for determining
appropriate support and fastening methods to
ensure compliance with all applicable codes.
®
Curb Outside Dimensions and Weights
C
B
Unit
A
B
Size
ECV-10 52.3
26.4
16.5 x 11.5
ECV-20 55.8
39.8
28 x 13.5
ECV-30 55.8
57.7
47.5 x 13.5
ECV-40 55.8
76.8
66.7 x 13.5
All dimensions are in inches. Weight is for 14-inch high
model GKD curbs.
Side of Unit
A
B
C
D
E
Roof Curb
Curb Cap Details for Factory-Supplied Roof Curbs
Unit Size
A
B
ECV-10
1.9
5.3
ECV-20
1.9
6.8
ECV-30
1.9
6.8
ECV-40
1.9
6.8
All dimensions are in inches.
D
A
Curb
C
D
Weight
(lbs.)
8.5 x 11.6
60
25.2 x 15.6
79
42.7 x 15.6
95
54 x 15.6
110
Base
1-inch Insulation
C
D
4.3
0.8
5.8
1.6
5.8
1.6
5.8
1.6
Energy Core Ventilator
E
0.4
0.4
0.4
0.4
7
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