Greenheck Fan HRE-20 Roof Curb Mounting, Factory Supplied Roof Curbs, Install Curb, Set the Unit

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, which are shipped in a knockdown kit (includes duct adapter) and require field assembly (by others).. Assembly instructions are included with the curb..

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 coil drainage and 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..

Roof curb details, including duct location dimensions, are available on HRE roof curb assembly instructions.

L

W

Curb Outside Dimensions

Curb Outside Dimensions			Weight
Model	L	W
HRE-20	93	51	280
HRE-45	100..5	60..63	355
HRE-55	112..75	71..5	450
HRE-90	125..75	90..75	625

All dimensions shown are in inches..

Model		Curb Cap Dimensions
	A	B	C	D	E
HRE-20	2..00	2..00	1..00	0..88	0..75
HRE-45	2..00	4..25	2..00	1..31	0..50
HRE-55	2..00	4..25	2..00	1..31	0..50
HRE-90	2..00	4..25	2..00	1..31	0..50

All dimensions shown are in inches..

SIDE OF UNIT

A

B

C

D

E

ROOF CURB

BASE

1 INCH INSULATION

Curb CAP Details for Factory Supplied Roof Curbs

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