8
ExTERIOR DUCTING INSTALLATION
WEATHERHOOD LOCATION
• Decide where your intake and exhaust hoods will be located.
Locating the Intake Weatherhood
• Should be located upstream (if there are prevailing winds) from the
exhaust outlet.
• At a minimum of 2m (6’) away from dryer vents and furnace exhaust
(medium or high efficiency furnaces), driveways, oil fill pipes, gas
meters, or garbage containers.
• At a minimum height of 460mm (18’’) above the ground, or above
the level of expected snow accumulation.
• At a minimum distance of 1m (3’) from the corner of the building.
• Do not locate in the garage, attic, crawl space, or underneath deck.
Locating the Exhaust Weatherhood
• At least 460mm (18") above ground or above the depth of expected snow accumulation
• At least 1m (3’) away from the corner of the building
• Not near a gas meter, electric meter or a walkway where fog or ice could create a hazard
• Do not locate in a garage, workshop or other unheated space
INSTALLING THE DUCTING TO THE WEATHERHOODS
A well designed and installed ducting system will allow the HRV to operate at its
maximum efficiency. The inner liner of the flexible insulated duct must be secured
to the sleeve of the weatherhood (as close to the outside as possible) and to the
appropriate duct connection on the HRV. The insulation should remain full and not
crushed. The outer liner, which acts as a vapor barrier, must be completely sealed
to the outer wall and the HRV using tape and/or caulking. A good bead of high
quality caulking (preferably acoustical sealant) will seal the inner flexible duct to
both the HRV duct connection and the weatherhood prior to securing them.
To minimize airflow restriction, the flexible insulated duct that connects the
two outside weatherhoods to the HRV should be stretched tightly and be as
short as possible.
Twisting or folding the duct will severely restrict airflow.
See “Installation Diagram Examples” for installation examples.
1
Using the duct connection of
the outside hood, outline the
intake & exhaust holes to be
cut. The holes should be
slightly larger than the duct
connection to allow for the
thickness of the insulated
flexible duct. Cut a hole for
both the intake and exhaust
hoods.
3
Push the hood into the
opening and then attach
the hood to the outside
wall with mounting
screws.
Repeat the installation
procedure for both the
supply and exhaust hoods.
2
Pull the insulated flexible
duct through the opening
until it is well extended and
straight.
Slide the duct’s inner vinyl
sleeve over the hood duct
connection and secure. Pull
the insulation over the duct
and pull the vapor barrier
over the sleeve. Secure with
appropriate tape or sealant.
4
Using a caulking gun, seal
around both hoods to prevent
any leaks.
STEPS FOR HOOD INSTALLATION:
36" (1m)
min.
INTAKE
OUTSIDE CORNER
INSIDE CORNER
EXHAUST
18" (460mm) min.
18" (460mm) min.
6' (2m)
min.
36” (1m)
min.
