DUCTWORK
This method draws return air from specific points in the house and supplies an equal
amount of outside air into the return air duct of the air furnace. (Fig.9 & Fig.10)
Return air ducts of ERV should be installed in areas of the home where the poorest indoor
air quality exists (bathroom and kitchen).
The air furnace blower should be running when the ERV is operating to evenly distribute the
outside air throughout the house.
Method - Partially dedicated ducted installation
Note
(1)The ERV unit must be balanced.
(2)It is mandatory that HVAC/AHU signal cord be
connected.
(3)Check local codes and authority having
jurisdiction for acceptance.
Note
(1)Must have 2-3 feet of straight duct run from all duct attachment points on the
ERV. Do not use any elbows or other peripheral pieces inside of 2-3 feet when
attaching duct runs to the ERV.
(2)Unit is normally balanced on high speed with the furnace blower on.
(3)A minimum separation of 40 inches (1 m) is recommended between the two
direct connections.
(4)The exhaust air connection shall be upstream of the supply air connection to
prevent exhausting any fresh air.
(5)The distance between two outdoor hoods please see P.12.
(6)The airflow must be confirmed on site using the balancing procedures found in
P.14.
Fig.8
10
36”
Air
furnace
(914 mm)
Min.
Dampers for
balancing
airflows
40" (1 m) Min.
Outdoors
OA
EA
RA
SA
Return
air
Return air
Fig.9
