Greenheck Fan 473501 Roof Curb Mounting, Curb Outside Dimensions and Weights, Install Ductwork

Roof Curb Mounting

Curb Outside Dimensions and Weights

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.

Factory Supplied Roof Curbs: Roof curbs are Model GKD, which are shipped in a knockdown kit (includes duct adapter) and require field assembly (by others). Assembly instructions are included with the curb.

Install Curb: Locate curb over roof opening and fasten in place. Reference Installation, Unit Weights

SIDE OF UNIT

A

B

C

D

E

BASE

1 INCH INSULATION

and Recommended Roof Openings in this manual. Check that the diagonal dimensions are within ±1/8 inch of each other and adjust as necessary. For proper coil drainage and unit operation, it is important that the installation be level. Shim as required to level.

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.

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		Set the Unit
curb and is level.
Curb Outside Dimensions and Curb Weights (lbs)
Unit Size	L	W	Weight
ERCH-HP 20	104.88	51.00	310
ERCH-HP 45	115.75	60.63	400
ERCH-HP 55	129.88	71.50	510
ERCH-HP 90	148.13	90.75	720

All dimensions are in inches. Weights are for 12 inch high curbs. Roof curb details, including duct locations dimensions are available on the roof curb assembly instructions.

10Model ERCH-HP Energy Recovery Unit

ROOF CURB

Curb Cap Details for Factory-Supplied Roof Curbs

Curb Cap Dimensions

Unit Size	A	B	C	D	E
ERCH-HP 20	2.00	2.00	1.00	0.88	0.75
ERCH-HP 45	2.00	4.25	2.00	1.31	0.50
ERCH-HP 55	2.00	4.25	2.00	1.31	0.50
ERCH-HP 90	2.00	4.25	2.00	1.31	0.50

All dimensions are in inches.