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HR150B, HR200B PERFECT WINDOW™ FRESH AIR VENTILATION SYSTEMS
Mounting Position and Location
The fresh air ventilation system can be suspended from
exposed ceiling joists, ceiling surface or floor mounted. (Level
ventilator so drains function correctly.)
• Locate fresh air intake 6 ft (2m) or more from stale air
exhaust to prevent exhaust air from re-entering.
• Locate ventilator where length of ducting required is
minimal.
• Pipe drain line from the ventilator to a drain.
• Allow space for drain line by placing the ventilator at least
10 in. (254 mm) off the floor.
• For access and removal of ventilator core, allow at least
25 in. (635 mm) of open space in front of unit.
Ducting
Ducting between the ventilator and the outdoors must be
insulated and have a continuous air vapor barrier. See Fig. 3.
IMPORTANT
All ducting to the outdoors must be terminated above
anticipated snow lines and be fitted with a weather
cap that incorporates bird screening.
SEAL OUTER LINING OF FLEX
DUCT TO OUTER COLLAR
INSULATED
FLEX DUCT
SEAL INTERIOR LINING OF
FLEX DUCT TO INSIDE COLLAR
Fig. 3. Sealing insulated duct terminations.
68-0285
Design and installation of ductwork must be according to
standard HVAC practice to deliver required quantities of fresh
air to temperature-controlled space and exhaust equivalent
quantities of room air to the outside.
Keep intake and exhaust duct runs as short as possible with
few bends or elbows.
• Keep duct sizes as large as possible throughout the
installation.
• Use a 6 in. diameter round duct for all connections to and
from the ventilator.
• Separate outside intake and exhaust vents by at least
6 ft (2m).
NOTES:
—
—
• Ducting the supply outlet and/or the exhaust inlet of the
ventilator to the return air plenum of the air handler is an
excellent way to distribute fresh air and exhaust stale air
from all parts of the house, while reducing installation costs.
When choosing this method, balance the ventilator when
the air handler is running and interlock the ventilator so that
it can run only when the air handler runs. See Fig. 4. An
alternate method is to balance the ventilator when the air
handler is not running and let the ventilator run whether the
air handler is running or not, see Fig. 5. An independent
installation is shown in Fig. 6.
COLLAR ON
VENTILATOR
NOTE: When the home is occupied, continuous operation of
M6557
• An electrical interlock and an automatically powered
damper must be used to prevent unwanted entry of outside
air if the ventilator is turned off while the furnace air handler
continues to operate.
4
Do not locate the fresh air vent where it blows
directly onto occupants or the thermostat.
Do not locate the fresh air intake close to known
sources of pollutants such as automobile exhaust,
a dryer vent or chimney smoke.
the ventilator is recommended. When the furnace air
handler operates, fresh air is distributed through the
heating/air conditioning supply registers. When the air
handler is off, fresh air is delivered through both sup-
plies and returns.
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