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Interior ducting installation
• To maximize airflow through the ductwork system, all ducts should be kept short and have as few bends or elbows as possible.
• 45º elbows are preferable to 90º.
• Use "Y" ducts instead of "T" ducts whenever possible.
• All duct joints must be fastened with screws or duct sealant and wrapped with aluminum foil duct tape to prevent leakage.
• Galvanized ducting from the FAA to the living areas in the house is recommended whenever possible, although flexible ducting
can be used in moderation when necessary.
• The main supply and return line to/from the FAA must have the same diameter as the duct connection or larger.
• Branch lines to the individual rooms may be as small as 100 mm (4'').
Installing ducting to FAA
Position a 12" (300mm) section of nonmetallic flexible duct onto duct collar.
Using (1) cable tie, attach flexible ducting with the correct FAA duct collar.
Supply air grilles location
In homes without a forced air system, fresh air should be supplied to all habitable rooms, including bedrooms and living areas. It should be supplied
from high wall or ceiling locations. Grilles that diffuse the air comfortably are recommended. In homes with a forced air system, you may want to
connect the FAA to the system's ductwork (see information below).
Exhaust air grilles location
The stale air exhaust system is used to draw air from the points in the house where the worst air quality problems occur. It is recommended that
return air ducts be installed in the bathroom, kitchen, and laundry room. Additional return air ducts from strategic locations may be installed. The
forced air system's return duct may also be used to exhaust from. In this method, the exhaust air is not ducted back from bathrooms, kitchens, etc
to the FAA with "dedicated lines".
As per building codes and installation requirements for combustion appliances:
Air return ducts, or openings for air return, should not be placed in enclosed spaces containing combustion
appliances that are subject to spillage.
*Collars may differ depending on the unit.
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