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3
Set the Roof Curb
— Fit the roof curb assembly by measuring
across the corners of the curb to ensure a square fit. Set the roof
curb over the roof opening. Level the curb by placing shims
under the bottom flange of the curb. Secure the curb in place by
welding or fastening the curb to the roof.
Install Ductwork
— Ductwork will be installed in the roof
curb for vertical, coupled applications. The duct will hang from
the top of the curb.
NOTE: Ductwork must be installed before the rooftop unit is
set in place.
NOTE: Ductwork must be installed before the ERV unit is set
in place.
Refer to Fig. 2 and 3 to determine the duct size required.
Provide field manufactured duct and place into the supply and
return openings in the curb.
Install Gaskets
— The ERV roof curbs come with a gasketing
package to provide a seal between the ERV unit and the top
perimeter of the roof curb. Install the gasket around the top
perimeter of the curb and around the supply and return
opening. (Some stand-alone curbs will not have duct open-
ings.) Gasket strips must fit tightly together, leaving no gaps for
leakage.
Install Roofing Materials
— Insulate and add a cant strip to
the roof curb. Follow suggested and acceptable roofing proce-
dures for applying roofing materials. The roofing material
should extend up to the wood nailer and be secured under the
counter flashing. Follow all local, national, and industry roof-
ing standards. Refer to Fig. 5 for roofing recommendations.
IMPORTANT: The ERV roof curb must be set in
precisely the correct location relative to the rooftop
roof curb for the transitions to connect properly. See
Fig. 7-44 for location dimensions.
IMPORTANT: Gasket installation is critical for water
integrity. Improperly installed gaskets can result in air
or water leaks, leading to poor unit performance.
10.81
11.00
11.50
RETURN
SUPPLY
14.00
1.00
TYP. 4X
3.00
TYP. 4X
24.09
22.94
NOTES:
1. All dimensions are in inches.
2. Roof curb shipped unassembled.
Fig. 2 — Roof Curb — 62M040 for Stand-Alone Applications