Page 5 of 9 9/19/2012
3.5.2 At the end of the project, the filters should not be removed, instead the intake
opening should be sealed with polyethylene film and duct tape.
Fig. 2 Pre-filter Pad Fig. 3 Ring Panel Filter
4. FILTRATION:
4.1 First Stage Filter (Pre-filter Pad):
4.1.1 24” x 24” x 1”
4.1.2 Double Ply
4.1.3 Removes large particles up to 10 microns and larger from the air flowing through the
unit, thereby preventing premature loading of the second stage and HEPA filters. The
pre-filter pad (see fig 2) is recommended to be changed as it becomes loaded and
the airflow capacity of the unit decreases, or the pressure gauge at the control panel
exceeds 2.6 inches at high speed or 1.9 inches at low speed, of W.C. (see fig 1).
4.2 Second Stage Filter (Ring Panel Filter):
4.2.1 24” x 24” x 1”
4.2.2 Triple Ply Ring Panel
4.2.3 Removes particles up to 1 micron and larger from the air flowing through the unit,
thereby protecting the more expensive, HEPA filter. The ring panel filter (see fig 3) is
recommended to be changed as it becomes loaded and the airflow capacity of the
unit decreases, or the pressure gauge at the control panel exceeds 2.6 inches on
high speed (1.9 inches on low speed) of W.C. (see fig 1).
4.3 Third Stage Filter (HEPA):
4.3.1 24” x 24” x 11.5”
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