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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 HRV to the living areas in the house is
recommended whenever possible, although flexible ducting can be used
in moderation when necessary.
• To avoid possible noise transfer through the ductwork system, a short
length (approximately 300mm, 12’’) of nonmetallic flexible insulated
duct should be connected between the HRV and the supply/exhaust
ductwork system.
• The main supply and return line to/from the HRV must have the same
diameter as the duct connection or larger.
• Branch lines to the individual rooms may be as small as 100mm (4’’).
INSTALLING DUCT TO HRV
For flexible duct installation, slide flexible ducting onto duct connection. Then install a cable tie over flexible duct to prevent leakage
between the ducting and the duct connection.
In the case of solid ducting, slide duct over duct connection, screw in place and seal.
SUPPLY AIR GRILLES LOCATION
In homes without a forced air furnace, 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 furnace, you may want to connect the HRV to the furnace 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 furnace 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 HRV 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
