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Model ERVe Energy Recovery Unit
Lifting with a Crane
1. Before lifting, be sure that all shipping material
has been removed from unit.
2. To assist in determining rigging requirements,
weights are shown below.
3. Unit must be lifted by all corner lifting points
provided on base structure.
4. Rigger to use suitable mating hardware to attach
to unit corner lifting points.
5. Spreader bar(s) must span the unit to prevent
damage to the cabinet by the lift cables.
6. Always test-lift the unit to check for proper
balance and rigging before hoisting to desired
location.
7. Never lift units by weatherhoods.
8. Never lift units in windy conditions.
9. Preparation of curb and roof openings should be
completed prior to lifting unit to the roof.
10. Check to be sure that gasketing (supplied by
others) has been applied to the curb prior to
lifting the unit and setting on curb.
Recommended Roof Opening
Unit Weights (lbs.)
Unit Size Approx. Weight
ERVe-20 825
ERVe-35 1100
ERVe-45 1275
ERVe-55 1550
A
EXHAUST
INLET
SUPPLY
OUTLET
1.63
B
1.63
Unit
A B
ERVE-20
22
37
ERVE-35 25
44.5
ERVE-45
27
51.5
ERVE-55
27
60
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
(25mm) 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
ERVe-20 22 37
ERVe-35 25 44.5
ERVe-45 27 51.5
ERVe-55 27 60
All dimensions are in inches.
The weights shown are a worst case scenario based
on the sheet metal and component weights for the
unit. These weights include sheet metal weights
added together with the largest motors, blowers and
accessories for the units.
Lifting with a Forklift
Unit base rail includes fork-able lifting locations. Use
weights shown to determine forklift size requirements.
Roof Curb and Rail Mounting