Roof Mounted Unit - Arrangement Dbc; Install Ductwork - Greenheck MSX Installation, Operation And Maintenance Manual

Installation of Roof Mounted Unit
Arrangement DBC
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. Attach the
equipment support(s) to the roof, remove metal cover,
flash to wooden nailer and reinstall cover.
Metal Cover
Equipment
Support
Roof Curb and Equipment Support
2. Install Combination Extension
Install combination extension over curb. Lag into
place using wood screws. Locate the extension so the
tall vented side is over the
exhaust opening.
Combination Extension

3. Install Ductwork

Good duct practices should be followed for all
ductwork. All ductwork should be installed in
accordance with SMACNA and AMCA guidelines,
NFPA 96 and any local codes. Reference the CAPS
submittal for ductwork size and location.
The use of a duct adapter is recommended on a
downblast (DBC) arrangement to align the ductwork
with the supply unit. The duct adapter is only a guide
and is not to be used as a support for the ductwork.
®
Roof Curb
Exhaust
1 inch
Inside Flange
Supply
Exhaust
Ductwork
by Others
Supply
Ductwork
by Others
Ductwork
NOTE
4. Apply Sealant
Apply an appropriate sealant around the perimeter of
the curb and duct adapter(s) to isolate fan vibration
and prevent water penetration.
Sealant
Supply Duct with
Duct Adapter Installed
5. Install Exhaust Fan
Fasten exhaust fan to curb extension with self-
tapping sheet metal screws. Installing the exhaust fan
prior to the supply unit will allow for easier installation
of options.
Model CUBE
Exhaust Fan
NFPA 96 requires the exhaust fan to be hinged.
6. Install Exhaust Options
Install optional Greenheck hinge kit with restraining
cables and grease trap with drain connection.
Exhaust
Ductwork
Exhaust Duct
by Others
Installed
Supply
Ductwork
by Others
Sealing Ductwork
Installing Exhaust Fan
NOTE
Model MSX Make-Up Air
5