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8
For the Installer
6.2 INSTALLING THE DUCTWORK AND REGISTERS
• Keep it simple. Plan for a minimum of bends and joints.
• Keep the length of insulated ducts to a minimum.
• If the house has two floors or more, be sure to plan for at least one exhaust register at the highest lived-in level.
6.2.1 FULLY DUCTED SYSTEM
Stale air exhaust ductwork
• Install the stale air exhaust registers where the contaminants are produced:
kitchen, living room, etc. Position the registers as far from the stairway as
possible and in such a way that the air circulates in all the lived-in spaces in
the house.
• If a register is installed in the kitchen, it must be located at least 4 feet (1.2 m)
away from the range.
• Install the registers on an interior wall, 6 to 12 inches (152 to 305 mm) away
from the ceiling OR in the ceiling.
Fresh air distribution ductwork
• Install the fresh air distribution registers in bedrooms, dining rooms, living
room and basement.
• Keep in mind that the fresh air registers must be located as far as possible
from the stale air registers.
• Install the registers either in the ceiling or high on the walls, with the air flow
directed towards the ceiling.
• If a register must be installed in the floor, direct the airflow up the wall.
• Never install a stale air exhaust register in a closed room where a combustion device operates, such as a gas
furnace, a gas water heater or a fireplace.
• When performing duct connections, always use approved tools and materials. Respect all corresponding laws
and safety regulations. Please refer to your local building code.
⚠ WARNING
VH0081
6.2.2 CENTRAL DRAW POINT SYSTEM - SUPPLY SIDE
Stale air exhaust ductwork
• Same as for fully ducted system (see section 6.2.1)
Fresh air distribution ductwork
• Cut an opening into the furnace supply duct at least 18 inches (0.5 m) away
from the furnace/air handler.
• Connect this opening to the Fresh air distribution port of the unit (use a
metal duct, see figure aside).
• Make sure the unit duct forms an elbow inside the furnace/air handler
ductwork.
NOTE: For this type of installation, it is recommended, however not essential,
that the furnace blower be synchronized with the unit.
VH0126
18” (0.5 M)
MINIMUM
When performing duct connections to the furnace supply duct,
use metal ducts appropriately sized to support the additional
airflow produced by the unit.
CAUTION
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