9
DUCT INSTALLATION
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.
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
ⅠⅠ
- 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 ft straight run on all duct attachments points before elbow is more
than 2 ft (610 mm).
(2)Unit is normally balanced on high speed with the furnace blower on.
(3)The distance between two outdoor hoods please see P.11.
(4)The airflow must be confirmed on site using the balancing procedures found in P.13.
Air
furnace
(914 mm)
Min.
Dampers for
balancing airflows
OA
EA
RA
SA
Outdoors
Return air
Return air
36”
Return air from various parts of home.
(i.e. bathrooms, kitchens, utility areas)
