6 18-HE58D1-5
Installer’s Guide
EXHAUST AIR FROM RETURN DUCT / FRESH AIR
DUCTED TO SUPPLY AIR DUCT
Figure 10
Note: Backdraft damper is required with this ducting
application. Failure to install according to Figure 10
may cause uneven pressure differential between sup-
ply and exhaust air. This could result in a risk of back-
drafting vented gas appliances.
INSTALL DUCT COLLARS
Attach one each of four duct collars to the fresh air inlet
and outlet, exhaust air inlet and outlet with the screws
provided in the plastic small parts bag. Use duct
mastic or equivalent approved caulk to form seal
around duct collar. (Optional) See figure 11.
Figure 11
C. DUCTWORK INSTALLATION - ERV TO
EXTERIOR WALL OUTLETS
Failure to follow this installation instruction may result
in property damage from sweating ductwork.
The fresh air duct and exhaust air duct connect the ERV
to the exterior wall outlet. Flexible or metal duct may be
used. The fresh air and exhaust air duct must be insu-
lated.
Keep the fresh air supply and exhaust duct roughly
equal in length and as short and straight as possible.
Typically, six (6) inch insulated flexible duct is used
for the EERVR100/200A1P00B and eight inch for the
EERVR300A1P00B. If using flexible duct band or tape
the inner duct liner to the inner flange of appropriate
collar. Drive a sheet metal screw through the liner to
secure the duct spiral wire to the collar. Straighten
insulation, and slide the outer duct jacket onto the outer
flange of the duct collar. Secure with band or tape. The
outer flange of the duct collar can be used for both the
inner and outer jacket of eight (8) inch flexible duct.
Care must be taken to insure that the duct is securely
fastened and sealed to the duct collar.
If duct runs are exceedingly long (over 25 feet of duct
for the EERVR100 or 300 and over 15 feet for the
EERVR200) see the Air Conditioning Contractors Asso-
ciation of America’s (ACCA) duct sizing manual “Manual
D” to design the appropriate sized ductwork.
FRESH AND EXHAUST AIR INLET AND
OUTLET INSTALLATION
Failure to follow the installation instructions for loca-
tion of the fresh air inlet and return air grilles could
result in Carbon Monoxide Poisoning or Death.
The fresh air inlet should be at least ten feet away from
any exhaust such as chimneys, furnace vents, water
heater exhausts, dryer vents, driveways or other sources
of carbon monoxide or contamination. Do not locate a
fresh air inlet where vehicles may be serviced or left
idling. Never locate the fresh air inlet inside a structure.
Do not install return air grilles (stale air return) in ga-
rages, or in the same room with any gas fired appliance;
for example a gas fired furnace, gas fired water heater,
gas dryer, etc.
Do not connect ERV ductwork to kitchen vent hoods
Do not connect a dryer directly to an ERV
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