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Guide Specifications
1.0 General
1.1 High temperature separator style HEPA filters
shall be Alpha HT models as manufactured by
Flanders.
1.2 Filter sizes, capacities and construction options
shall be as scheduled on the drawings.
2.0 Filter Construction
2.1 The filter pack shall be constructed by pleating a
continuous sheet of non-woven water-resistant
fiberglass media around hemmed-edge corrugat-
ed aluminum separators.
2.2 The filter pack shall be sealed into a (409 stain-
less steel) (304 stainless steel) frame with a
high temperature silicone sealant rated for 500°F
or a glass pack sealant rated for 1,000°F in
exhaust applications.
2.3 (A chlorastic silicone gasket) (a woven glass
gasket) shall be provided to seal the filter in the
mounting device (Gasket Seal). A silicone gel
shall be provided in a channel on one side to
seal the filter in the mounting device. filters with
silicone gel have a maximum service tempera-
ture of 390°F (Gel Seal)
3.0 Performance
3.1 Initial and final resistances shall not exceed the
scheduled values.
3.2 Alpha HT HEPA Filters shall have a minimum
efficiency of 99.97% on 0.30 micrometer parti-
cles when tested at rated capacity on a Q-107
Penetrometer. Each filter shall be challenged
with an approved nearly monodispersed oil
aerosol of 0.30 micrometer size. Measure the
upstream and downstream concentration of
these particles with a light scattering photometer,
determine the penetration and calculate the effi-
ciency.
3.3 Alpha HT Scan Tested HEPA Filters shall have
a minimum efficiency of 99.99% on0.30microme-
ter particles. Scan Testing shall be in accor-
dance with Section 6.2 of IEST-RP-CC034.1.
The scan test shall consist of challenging the fil-
ter with a high concentration of an approved oil
aerosol or PSL Spheres. Utilizing a photometer
or particle counter, the media pack and the pack-
to-frame seal shall be scanned to insure that
there are no leak greater than .01% of the
upstream concentration at 100 fpm face velocity.
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