28
CAUTION
A drain is required. However in climates where the outdoor
temperature remains above 13ºF (25ºC) combined with
an indoor humidity less than 30%, the use of a drain is
optional.
Installing Grilles and Diffusers
Use adjustable grilles or diffusers to balance the flow rates
into and out of various rooms. The grilles should not be
adjusted after balancing the unit.
Install grilles or diffusers high on the wall or in the ceiling.
Kitchen grilles must never be connected to a range hood.
Install grilles at least four feet (1.2 meters) horizontally
away from the stove.
Install field-supplied balancing dampers 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
“Airflow Balancing” on page 38.
CAUTION
Potential equipment malfunction or damage.
May require repairs and/or void warranty.
Do not install intake grille within four feet (1.2 m) of a
kitchen stove or cooking surface that emit cooking vapors.
KITCHEN GRILLE
The kitchen grille includes a removable grease filter. Most
building codes require that kitchen grilles be equipped with
a washable grease filter.
Table 13. Kitchen Grille
Size
Catalog Number
REMOVABLE
GREASE FILTER
6 x 10”
(152 x 254
mm)
18N48
ROUND DIFFUSER
The round diffuser is a fully adjustable grille which provides
superior, quite air distribution. These diffusers are available:
ROUND DIFFUSER
AIR FLOW
SUPPLY
AIR FLOW
EXHAUST
Figure 30. Round Diffusers
Table 14. Round Diffusers Sizes
Size
Catalog Number
4” (102 mm)
92E54
5” (127 mm)
92E55
6” (152 mm)
92E56
7” (203 mm)
56N81
Installing Weatherhoods
INSTALLING DUCTING FROM WEATHERHOODS TO
THE (ERV/HRV) UNIT
The inner and outer liners of the flexible or rigid insulated
duct must be clamped to the sleeve of the weatherhoods
(as close to the outside as possible) and the appropriate
port on the ERV/HRV. It is very important that the fresh air
intake line be given special attention to make sure it is well
sealed. A good bead of high quality caulking (preferably
acoustical sealant) will seal the inner flexible duct to both
the ERV/HRV port and the weatherhood prior to clamping.
To minimize airflow restriction, the flexible or rigid insulat
-
ed duct that connects the two outside weatherhoods to the
ERV/HRV unit should be stretched tightly and be as short
as possible.
Twisting or folding the duct will severely restrict airflow.
Refer to local building codes for complete local installation
requirements.
INTAKE WEATHERHOOD REQUIREMENTS
Observe the following when installing the intake weather-
hood:
• Should be located upstream (if there are prevailing
winds)
• At least six feet (two meters) away from dryer vents and
furnace exhaust (medium or high efficiency furnaces)
• A minimum of at least six feet (two meters) from drive-
ways, oil fill pipes, gas meters, or garbage containers
•
At least 18” (457 mm) above the ground, or above the
depth of expected snow accumulation
• At least three feet (one meter) from the corner of the
building
•
DO NOT locate in a garage, attic or crawl space
• AFTER installing the weatherhood, its outside perime-
ter must be sealed with exterior caulking
• To be installed in accordance with local building codes
or manufacturer recommendations.
EXHAUST WEATHERHOOD REQUIREMENTS
Observe the following when installing the exhaust weath-
erhood:
•
At least 18” (457 mm) above ground or above the depth
of expected snow accumulation
• At least three feet (one meters) 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.
•
Not into a garage, workshop, or other unheated space
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