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1010
For the Installer
5.3.2 exHauSt DucteD SyStem - SuPPly SiDe
CAUTION
When performing duct connections to the furnace supply duct, use
metal ducts appropriately sized to support the additional airflow
produced by the unit.
Stale air from building ductwork:
• Install registers in areas where contaminants are produced: Kitchen, bathrooms,
laundry room, etc.
• Install registers on an interior wall, 6 to 12 inches (152 to 305 mm) away from the
ceiling OR install them in the ceiling.
• Install the kitchen register at least 4 feet (1.2 m) away from the range.
Fresh air to building ductwork:
• Cut an opening into the furnace supply duct at least 18 inches (0.5 m) away from
the furnace.
• Connect this opening to the fresh air to building port of the unit (use metal ducts,
see illustration at right).
• Make sure that the unit duct forms an elbow inside the furnace ductwork.
NOTE : For this type of installation, it is recommended, however, not essential, that the
furnace blower be synchronized with the unit.
5.3.3 exHauSt DucteD SyStem - RetuRn SiDe
Stale air from building ductwork:
• Install registers in areas where contaminants are produced: Kitchen, bathrooms,
laundry room, etc.
• Install registers on an interior wall, 6 to 12 inches (152 to 305 mm) away from the
ceiling OR install them in the ceiling.
• Install the kitchen register at least 4 feet (1.2 m) away from the range.
Fresh air to building ductwork:
• Cut an opening into the furnace return duct at least 10 feet (3.1 m) away from
the furnace (A+B).
• Connect this opening to the fresh air to building port of the unit (see illustration
at right) using metal ducting.
NOTE : For this type of installation, it is recommended, however, not essential, that the
furnace blower be synchronized with the unit.
5.3.4 SimPliFieD inStallation - RetuRn/SuPPly
Stale air from building ductwork:
• Cut an opening into the furnace return duct at least 10 feet (3.1 m) (A + B)
away from the furnace.
• Connect this opening to the stale air from building port of the unit (as
illustrated).
Fresh air to building ductwork:
CAUTION
When performing duct connections to the furnace supply duct, use
metal ducts appropriately sized to support the additional airflow
produced by the unit.
• Cut an opening into the furnace supply duct at least 18 inches (0.5 m) away from
the furnace.
• Connect this opening to the fresh air to building port of the unit (use metal ducts,
see illustration at right).
• Make sure that the unit duct forms an elbow inside the furnace ductwork.
NOTE : For this type of installation, it is recommended, however, not essential, that the
furnace blower be synchronized with the unit.
VH0157
18” (0.5 m)
minimum
VH0158
B
A
VH0159
B
A
18” (0.5 m)
minimum
A + B = AT LEAST
10’ (3.1 M)
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