Multi-Section Assembly
When the finished damper assembly is made up of multiple sections, the sections will require field assembly. Frame
clips are provided for this purpose. The frame clips are a snap fit component that fit over the joint between adjoining
sections. The clips will require the use of a rubber hammer of similar tool to install as shown below. Install frame clips
on the front side and backside of the assembly. For added strength, screws may be used on the backside of the
frames in lieu of or in addition to the frame clip. Do not install screws on the front side of the frame where they could
interfere with the operation of the blades.
Note: Used only on EM series dampers.
Frame clip
Front side of damper blade
overlaps the frame.
Blade
Use screws here if
necessary
Vertical joint shown. Horizontal joint is similar.
Frame clip
Adjustment #2: Balance the Blades in the Open
Position
The damper is factory assembled with the
counterbalance weights and bracket installed such
that, when the blades are closed, the counterbalance
weights and bracket are positioned directly in-line or
slightly ahead of the blade pivot points. The position of
the weights will provide a slight load that will cause the
blades to rotate from the full open position toward the
closed position. To increase this load, the counterweight
mounting brackets can be bent toward the adjacent
blade surface. Bending the counterweight mounting
brackets will move the counterweight stack which
will force the blades to start closing. This adjustment
should be performed in small increments to each weight
bracket since bending the brackets too much cause
the weight stack to interfere with the adjacent blade
surface.
483513 • ES EM GM IOM, Rev. 1, September 2018
Copyright 2018 © Venco Products
4
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without notice.
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