5
5˝ø
65
CFM
5˝ø
64
CFM
4˝ø
42
CFM
4˝ø
42
CFM
4˝ø
42
CFM
6˝ø
96
CFM
6˝ø
84
CFM
6˝ø
138
CFM
7˝ø
222
CFM
7˝ø
222
CFM
6˝ø
93
CFM
6˝ø
129
CFM
5˝
5˝
6˝
6˝
6˝
6˝
7˝
7˝
4˝
4˝
4˝
4˝
4˝
A12289
Fig. 9 - Example of a design for a fully ducted system for a unit having a high speed performance of 222 cfm
Installing the Ductwork and the Registers
PERSONAL INJURY HAZARD
Failure to follow this caution may result in personal injury.
Never install a stale air exhaust register in a room where there
is a combustion device, such as a gas furnace, a gas water
heater or a fireplace.
!
WARNING
PROPERTY DAMAGE HAZARD
Failure to follow this caution may result in property damage.
The ductwork is intended to be installed in compliance with
all local and national codes that are applicable.
CAUTION
!
Fully Ducted System
STALE AIR EXHAUST DUCTWORK:
S
Install registers in areas where contaminants are produced:
Kitchen, bathrooms, laundry room, etc.
S
Install registers 6 to 12 inches (152 to 305 mm) from the ceiling
on an interior wall OR install them in the ceiling.
S
Install the kitchen register at least 4 feet (1.2 m) from the range.
S
If possible, measure the velocity of the air flowing through the
registers. If the velocity is higher than 400 ft/min. (122 m/min),
then the register type is too small. Replace with a larger one.
FRESH AIR DISTRIBUTION DUCTWORK:
S
Install registers in bedrooms, dining room, living room and
basement.
S
Install registers either in the ceiling or high on the walls with air
flow directed towards the ceiling. (The cooler air will then cross
the upper part of the room, and mix with room air before
descending to occupant level.)
S
If a register must be floor installed, direct the air flow up the wall.
Exhaust Ducted System
STALE AIR EXHAUST DUCTWORK:
Same as for Fully Ducted System above.
FRESH AIR DISTRIBUTION:
PROPERTY DAMAGE HAZARD
Failure to follow this caution may result in property damage.
When performing duct connection to the furnace, installation
must be done in accordance with all applicable codes and
standards. Please refer to your local building code.
!
WARNING
PROPERTY DAMAGE HAZARD
Failure to follow this caution may result in property damage.
When performing duct connection to the furnace supply duct,
this duct must be sized to support the additional airflow
produced by the ERV/HRV. Also, use a metal duct. It is
recommended that the ERV/HRV is running when the furnace
is in operation in order to prevent backdrafting inside
ERV/HRV.
CAUTION
!
There are two methods for connecting the unit to the furnace:
METHOD 1: SUPPLY SIDE CONNECTION
S
Cut an opening into the furnace supply duct at least 18 inches (0.5
m) from the furnace.
S
Connect this opening to the fresh air distribution port of the
HRV/ERV (use metal duct). See Fig. 10.
M
ETAL
DUCT
M
INIMUM
18’’ (0.5
M
)
A12290
Fig. 10 - Supply Side Connection
