Optional filters on fan-powered terminal units are 1” thick
disposable filters that are highly recommended if there is any chance that the
units will be operating during construction. Construction dust can easily ruin
both the motor and blower, if the units are operated without filters in place. Dust
tends to deposit unevenly on blower wheels resulting in loss of balance. Any
build-up of fine dust or lint on the exterior of a permanently-lubricated fan
motor can create a migration path and wick the oil out of the bearings.
These optional filters should later be removed and discarded
during the balancing and commissioning process. Operating units after construction
with filters in place is not recommended. Fan-powered units, like all terminal
units, are designed for zero maintenance. This is necessary because terminal
units, unlike air handlers, are typically located above finished ceilings in
tenant spaces. Accessing the units regularly to change filters can be nuisance
to tenants, time-consuming for maintenance personnel and can easily result in
ceiling damage.
If filtering of return air is desired, we recommend the
installation of filter grilles in the ceiling. This allows the building and the
building owner the benefits of less costly standard filter sizes; more filter
area for longer service intervals and quicker access for easier replacement.
Randy Zimmerman ~ Chief Engineer
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