Greenheck ERV (476412) - Manual (Page 6)

6 Energy Recovery Ventilator
Recommended Roof Openings & Weights
Position the unit roof opening such that the supply
discharge and exhaust inlet of the unit will line up
with the corresponding ductwork. Be sure to allow
for the recommended service clearances when
positioning opening (see Service Clearances).
Do not face the outdoor air intake of the unit into
prevailing wind and keep the intake away from any
other exhaust fans. Likewise, position the exhaust
discharge opening away from outdoor air intakes of
any other equipment.
When cutting only duct openings, cut opening 1 inch
(25 mm) larger than duct size to allow clearance for
installation. Area enclosed by roof curb must comply
with clearance to combustible materials. If the roof is
constructed of combustible materials, area within the
roof curb must be ventilated, left open, or covered
with non-combustible material which has an “R”
value of at least 5. If area within curb is open, higher
radiated sound levels may result.
Where the supply or warm air duct passes thru a
combustible roof, a clearance of one inch must be
maintained between the outside edges of the duct
and combustible material in accordance with NFPA
Standard 90A.
SUPPLY
DISCHARGE
EXHAUST
INTAKE
U
V
0.50
0.50
ERV-10, 20, 45 and 55
U
V
EXHAUST
INLET
SUPPL
Y
DISCHARGE
ERV-90 and 120
Unit Size U V
Approx.
Weight (lbs.)
ERV-10 26.5 20 340
ERV-20 43 26 860
ERV-45 58 35 1290
ERV-55 60 30 1470
ERV-90 62 36 3230
ERV-120 77 38 3700
All dimensions are in inches. *Weight assumes outdoor unit
with filters, weatherhoods and outdoor air intake damper.