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The increased filter area found in the <<W>> pattern
extends the life of the filter and reduces resistance to
airflow. In both cases, a framework of galvanized steel is
provided in the filter section, to guide and hold the cassette
type filter in position.
The filters are of the cassette type, disposable, medium
efficiency, consisting of a pleated media pack enclosed in
a metal frame. A wire grid to maintain the uniform shape
of the pleats, to ensure proper airflow and dust loading
at rated filter velocity, supports the media. The media have
an average spot efficiency of 25 to 30% when tested in accordance
with ASHRAE Standards 52-76 and have average arrestance of
not less than 90%.
This type of filter arrangement can act as main filter or
Pre-filter. For the installation of Bag filters, if specified,
INTERKLIMA has developed a special holding frame that permits
the Bag filter to slide in and out easily, something extremely
practical for service or replacement purposes. Further, through
a special tightening device on the holding frame, the filters
are pressed on the frame, to achieve proper fit and avoid
leakage.
Other filter types, such as HEPA,Carbon, Roll, etc., can
be supplied. For these special types of filters, suitable
frame arrangements are available.
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