Ductwork Connections; Rail Mounting / Layout - Greenheck ECV Series Installation, Operation And Maintenance Manual

Ductwork Connections

Examples of poor and good fan-to-duct connections
are shown. 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.
Length of Straight Duct
GOOD
Recommended Discharge Duct Size and Length
Unit Blower Size Duct Size
Size (dia.-width)
ECV-10 10-6
ECV-20 10-6
ECV-30 12-8 12-12
• 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.
8 Energy Core Ventilator
POOR
Straight Duct Length
(in.) (ft.)
14 x 14 35
14 x 14 35
20 x 20 50

Rail Mounting / Layout

• Rails designed to handle the weight of the unit
should be positioned as shown on the diagram
(rails by others).
• Make sure that rail positioning does not interfere
with the supply air discharge opening or the
exhaust air intake opening on the unit. Avoid area
dimensioned "B" below.
• Rails should extend beyond the unit a minimum of
12 inches on each side.
Unit Size
ECV-10
ECV-20
ECV-30
All dimensions are in inches.
B
A B
4.2 11.5
5 15
2.9 13.8
A
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