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5
®
Model MSX Make-Up Air
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.
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.
6. Install Exhaust Options
Install optional Greenheck hinge kit with restraining
cables and grease trap with drain connection.
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.
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.
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.
Supply
Ductwork
by Others
Exhaust
Ductwork
by Others
NOTE
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.
NOTE
NFPA 96 requires the exhaust fan to be hinged.
Metal Cover
Equipment
Support
Roof Curb
Roof Curb and Equipment Support
Exhaust
Supply
1 inch
Inside Flange
Combination Extension
Ductwork
Supply Duct with
Duct Adapter Installed
Exhaust Duct
Installed
Sealant
Sealing Ductwork
Model CUBE
Exhaust Fan
Installing Exhaust Fan
Supply
Ductwork
by Others
Exhaust
Ductwork
by Others