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Single Zone Vertical Air Handling Unit - CV Installation Manual
Due to our policy of continuous product innovation, some specifications may change without notification.
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Installing Ductwork
Installing Ductwork
Install ductwork to the 4-way Vertical Air Handling Unit as required for
your system. Some general guidelines are:
• Use more than 10 screws to join the supply duct to the VAHU.
• Seal all duct work according to local codes to prevent air leakage.
Ensure that filter access is unobstructed.
• The VAHU support platform must be sturdy enough to support the
cabinet plus any accessory components including filter box.
• The minimum height clearance is 14 inches to maintain proper air flow.
• Vibration isolators (field supplied) must be placed between the unit
and the pedestal.
• To prevent vibration transmission, use flexible connectors between
duct and the unit. If the optional electric heater is installed, it is man-
datory that the flexible connector between unit and duct at discharge
connection is made of heat resistant material.
• Duct work must be insulated and covered with vapor barrier when
routed through unconditioned space.
• To prevent the formation of condensation, insulate the duct well.
• Internal acoustical insulation lining may be necessary for the metal
duct system if it does not have a 90° elbow and 10ft. of main duct to
the first branch takeoff.
• It is advised that a fibrous duct work could be used as a substitute
if built and installed in accordance with the most recent edition of
SMACNA construction standard on fibrous glass ducts.
• Collectively, fibrous duct work and acoustical lining must follow Na-
tional Fire Protection Association standards 90A or B as tested by UL
standard 181 for class 1 air ducts.
• Seal around the duct after it is secured to prevent air leaks.
More than 6 screws (M4*25L)
More than
1inch (25mm)
Field Supplied
Return Plenum
Field Supplied
Supply Duct
Do not connect screws on front and rear side;
they may interfere with filter installation.
More than 10 screws
(M4*25L)
Figure 27: Installing Ductwork.
Figure 28: Securely Fasten Supply Duct.
GENERAL INSTALLATION GUIDELINES
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