Combination Extension; Discharge - Greenheck IGX Installation, Operation And Maintenance Manual

Installation Instructions for:
Roof Mounted with Optional Combination Extension
Downblast Discharge
Arrangement DBC
Step 1 Install Curb/Equipment Support(s)
Position curb/equipment support(s) on the roof
(reference the CAPS submittal for placement of
curb/equipment support(s) in relation to the unit). Verify
that all unit supports are level, shim if necessary.
Attach curb to roof and flash into place. When
attaching the equipment support(s) to the roof, remove
metal cover, flash to wooden nailer and reinstall cover.
Step 2 Install Combination Extension
Install combination extension over curb, use
wood screws to lag in place. Locate extension so
the tall vented side is over the exhaust opening,
as shown in illustration.
Step 3 Install Ductwork
Good duct practices should be followed for the
remaining ductwork.
The use of a duct adapter is recommended to
properly align the ductwork with the supply
unit. The duct adapter is only a guide and is not
intended to be used as support for the
ductwork.
Exhaust fan ductwork must be built in
accordance with NFPA 96 and any local codes.
Ductwork terminating at the fan should be
square in shape or of smooth transition so as
not to affect the fan performance.
Step 4 Apply Sealant
Before installing exhaust fan and supply unit,
apply a sealant around the perimeter of the
exhaust and supply duct adapter to seal and
isolate the fan and minimize vibration.
Metal Cover
Equipment
Support
Supply
Sealant
Supply Duct with Duct
Adapter Installed
6
Roof Curb
Exhaust
1 inch Inside
Flange
Exhaust
Ductwork
by Others
Supply
Ductwork
by Others
Exhaust Duct Installed