5
Energy Recovery Ventilator
Recommended Roof Opening & Weights
A
EXHAUST
INLET
SUPPLY
OUTLET
1.63
B
1.63
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.
Unit Size
A
B
Approx.
Weight (lbs.)
ERV
e
-20
22
37
825
ERV
e
-35
25
44.5
1100
ERV
e
-45
27
51.5
1275
ERV
e
-55
27
60
1550
All dimensions are in inches. These weights include sheet
metal weights added together with the largest motors,
blowers and accessories for the units.
Recommended Service Clearances
Unit Size
A
B
C
D
ERV
e
-20
24
24
42
35
ERV
e
-35
32
24
48
43
ERV
e
-45
32
24
54
43
ERV
e
-55
32
24
60
44
All dimensions are in inches.
Access Panel Description and
Location
1
Outdoor air filters
Frost control
Outdoor air sensors
Preheater and controls
Outdoor air intake damper
2
Supply blower and motor
3
Electric control center
Main disconnect
4
Energy wheel cassette
Exhaust air filters
Exhaust air intake damper
5
Exhaust blower and motor
Outdoor air intake damper actuator
Service Clearances
ERV
e
units require minimum clearances to perform
routine maintenance, such as filter replacement,
energy wheel cassette inspection, and fan belt
adjustment. Blower and motor assemblies, energy
recovery wheel cassette and filter sections are always
provided with a service door
or panel for proper
component
access.
D
C
B
A
D
CLEARANCE
CLEARANCE
1
2
3
4
5
