Specifications

Heat and Energy Recovery Ventilators (HRVs and ERVs) are whole house
ventilation systems that can provide a continuous stream of fresh outside air
while exhausting stale indoor air. These machines are the best ventilation
solution available for comfort, health and safety when constructing
a tight home. HRVs and ERVs are low flow systems that are
usually run continuously whenever the house is closed up.
An HR
V transfers heat from the outgoing air stream to the
incoming air stream. Select an HRV in the cold Northeast,
Midwest and also in the dry Southwest.
An ERV transfers heat and humidity from one air stream to the
other. Use an ERV in humid climates where air conditioning is used
extensively. During the cooling season this system will bring in fresh
air cooling it down while transferring the incomi
ng humidity to the outgoing stream.
During the
winter months, the ERV will transfer heat to the incoming stream and
transfer outgoing humidity back inside, helping to keep the home environment comfortable.
HRVs and ERVs transfer approximately 65% of heat and humidity.
National distributor shipping direct throughout the United States
to place orders or for more information:
800 / 876 / 0660
 fax 888 / 440 / 4219
Wisconsin 800 / 962 / 7015
 Wisconsin fax 920 / 757 / 6452
headquarters 40 Washington Street, Westborough, Massachusetts 01581 • www.efi.org/wholesale
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Whole House Ventilation System Tips
HRV/ERV Installation Tips
1. Exterior hoods for exhaust and supply should be installed at least 6' apart.
One hood brings in fresh air, the other exhausts stale air
2. Short, 6" round duct runs from the HRV/ERV to the outside hoods.
Best to insulate these short runs to avoid condensation.
3. HRV/ERV typically suspended from the basement
ceiling. Hanging kit comes with the machine.
Heat/humidity transfer happens in the
core of
the HRV/ERV.
4. 6" round rigid ducts used for trunk lines.
5. 4" branch lines are often used to travel
through inside walls and other framing. All
duct runs as straight as possible, use rigid
duct, with few elbows. Insulate any duct
traveling through un-conditioned spaces.
6. Exhaust and Supply ports located on ceilings or high
on walls, as far into rooms as possible.
7. Deliver fresh, filtered air to bedrooms, home offices, finished
basements. Places where people spend time.
8. Exhaust stale air from bath rooms, kitchens, hobby and
exercise rooms: places that generate moisture and odors.
9. Low voltage Central Control located in the main body of the house but
not the kitchen area.
10. Low voltage boost switches located in rooms where exhaust ports are
installed — bath rooms, hobby and exercise rooms.
Call EFI
Wholesale for further information and guidance.
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TIP: Even if you are installing exhaust ports
from your HRV or ERV to bathrooms, we
recommend also using an exhaust fan for
duty exhaust. The HRV/ERV runs slowly and
steadily and does a great job providing fresh
air and exhausting stale air. But to evacuate a
bathroom quickly, your customer will want to
have the option of additional exhaust.