Fantech SHR 1504 Operation Manual - page 16
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INTERIOR DUCTING INSTALLATION
GENERAL TIPS
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” tees instead of 90º elbows whenever possible.
All duct joints must be fastened with screws or duct sealant and wrapped with aluminium 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 mod-
eration 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 lines to/from the HRV must have a diameter of 150mm (6"). Branch lines to the individual rooms may be
as small as 100mm (4"), but 125mm (5") is preferred.
INSTALLING DUCT TO HRV
Collar is equipped with hooks that will prevent flexible duct from slipping. For flex duct
installation, slide flex onto collar and over hooks. Then install a cable tie over flex duct
to prevent leakage between the ducting and collar.
In the case of solid ducting, slide solid duct over collar, screw in place and seal with tape.
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 such as the Fantech metal grilles (MGE) or plas-
tic grilles (CG) are recommended. If the floor is the only option available, then special care should be taken in locating grilles. Areas
such as under baseboard heaters will help to temper the air. 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 recom-
mended that return air ducts be installed in the bathroom, kitchen, and laundry room. Additional return air ducts from strategic locations
(i.e. greenhouse, atrium, swimming pool, sauna, etc.) 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”.
DUCTING FIFTH PORT UNITS (R)
Units SHR1505R, SHR2005R, SHR3005R and SHR3205RD have a 5th port on top and units VHR1405R and VHR2005R have a 5th port
on the side. This duct port is for both the defrost and recirculation modes. A motorized damper installed in the port closes during defrost
or recirculation, temporarily blocking the incoming fresh air-stream, allowing the warm air from the house to circulate through the HRV. You
may wish to duct this port to a common room with clean air (living room or dining room), so when the recirculation mode is activated,
household odors from the kitchen, bathroom or basement won’t be introduced into the living spaces of the home environment.
WARNING!
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.