R
o
t
a
t
i
o
n
Length of Straight Duct
GOOD
Unit Side
Unit Base
Roof Curb
Insulation Pan
(Insulation not included)
6.692
1.549 2.601
Curb Cap Details for Factory Supplied Roof Curbs
Curb Outside Dimensions - continued
Recommended Discharge Duct Size and Length
Model
Blower
Size
Duct Size
Straight Duct
Length
ERVe-20 9 14 x 14 4
ERVe-35 10 20 x 20 5
ERVe-45 12 20 x 20 5
ERVe-55 15 28 x 28 7
All dimensions are in inches.
• Recommended duct sizes are based on velocities across
the cfm range of each model at approximately 800 feet
per minute (FPM) at minimum airflow and up to 1600 fpm
at maximum airflow. Recommended duct sizes are only
intended to be a guide and may not satisfy the requirements
of the project. Refer to plans for appropriate job specific
duct size and/or velocity limitations.
• Straight duct lengths were calculated based on 100%
effective duct length requirements as prescribed in AMCA
Publication 201. Calculated values have been rounded up to
nearest foot.
Ductwork Connections
Examples of poor and good fan-to-duct connections
are shown below. Airflow out of the fan
should be directed straight or curve
the same direction as the
fan wheel rotates. Poor
duct installation will result
in low airflow and other
system effects.
Isometric view of
ERVe on rails
Side view of
ERVe on rails
B A
Unit Size A
B
ERVe-20 5.75 18
ERVe-35 5.75 20.5
ERVe-45 6 22.5
ERVe-55 6 26
All dimensions are in inches.
Rail Mounting / Layout
1. Rails designed to handle the weight of the ERVe
should be positioned as shown on the diagram
(rails by others).
2. Make sure that rail positioning does not interfere
with the supply air discharge opening or the
exhaust air intake opening on the ERV
e unit. Avoid
area dimensioned “B” below.
3. Rails should extend beyond the unit a minimum of
12 inches on each side.
4. Set unit on rails.
Energy Recovery Ventilator 7
®
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