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.
Roof Curb
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. | Exhaust | 1 inch |
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| Inside Flange |
| Supply |
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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.
Exhaust Duct
Installed
Sealant
Supply Duct with
Duct Adapter Installed
Sealing Ductwork
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 
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.
Exhaust Ductwork by Others
Supply 
Ductwork by Others
Installing Exhaust Fan
NOTE
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.
Ductwork
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.
® | Model MSX | 5 |
