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Stale Air Exhaust System
The stale air exhaust system draws air from the points in
the house where the worst air quality problems occur.
Stale air ducts should be installed in the bathroom,
kitchen, and laundry room. Applications such as green-
houses, atriums, swimming pools, saunas, etc. have
unique ventilation requirements which should be
addressed with an isolated ventilation system. Also, the air
handler return duct may be used to exhaust from. In this
method, the exhaust air is not ducted back to the HRV
with "dedicated lines" from bathrooms, kitchens, etc.
Instead, the exhaust air is drawn out of the cold air return
of the air handler. The air handler blower must be run-
ning when the unit is operating for this system to be
effective.
Balancing Dampers and Grilles
Balancing dampers and/or adjustable grilles should be
used to balance the flow rates into and out of various
rooms.
Grilles or diffusers should be positioned high on the wall or
in the ceiling. Kitchen exhaust grilles must never be con-
nected to a range hood. They should be installed at least 4
feet (1.2m) horizontally away from the stove. A hinged
6”X10” (150 X 250mm) rectangular kitchen exhaust grille
is available. This grille includes a removable grease filter.
Canadian building codes require that kitchen grilles be
equipped with washable filters.
Field-supplied balancing dampers should be installed
external to the unit to balance the amount of stale air
being exhausted with the amount of fresh air being
brought into the house. Refer to Air flow Balancing sec-
tion.
The Round
Diffuser is available in
4" (100mm)
5” (125mm)
6" (150mm)
8" (200mm)
Drain Connection (HRV Only)
During a defrost cycle, the HRV may produce some con-
densation. This water should flow into a nearby drain, or
be taken away by a condensate pump.
The HRV has a condensate pan and drain spout built into
the door. Construct a P-Trap by creating a loop in the
drain. This creates a “trap” which will hold some conden-
sate and prevent odours from being drawn up the hose
and into the fresh air supply of the HRV.
AIR FLOW
SUPPLY
AIR FLOW
EXHAUST
Round
Diffusers
Kitchen Grille
REMOVABLE
FILTER
CAUTION
"P" Trap (HRV only)
Note: Secondary drain pan may be required to
protect from condensate leakage.
The HRV and all condensate lines must be
installed in a space where the temperature is
maintained above the freezing point.
CAUTION
Drain trap and tubing MUST be below bottom of
door with 1/4" per foot downwards slope away
from unit.
CAUTION
Installation