®
Alpha HT
High Temperature HEPA Filters
F O R E M O S T I N A I R F I LT R AT I O N
Bulletin PB1403-0107
General
Sealant Types
Two types of sealants for high-temperature HEPA
Flanders manufactures metal-frame separator-style
HEPA filters for applications with high-temperature
requirements up to 1,000°F (540°C) for exhaust air
only and 500°F (260°C) for supply air. High-tem-
perature filters are available with either a gasket or
fluid seal. Filters with Blu-Jel® Fluid Seal have a
maximum service temperature of 390°F (199°C)
filters are offered.
Silicone Sealant
This is a high temperature (RTV) silastic-sealant sil-
icone compound rated for continuous service up to
500°F(260°C). NOTE: This high-temperature
sealant is not UL 586 approved.
HEPA Filters
Glass Pack Sealant For Exhaust Air Only
Each HEPA filter has a minimum efficiency of
99.97% on 0.30 micrometer size particles when
tested at rated capacity on a Q-107 Penetrometer.
Each filter is challenged with an approved nearly
monodispersed oil aerosol of 0.30 micrometer size
and by measuring the upstream and downstream
concentration of these particles with a light scatter-
ing photometer, the penetration can be determined
and the efficiency can be calculated.
The glass pack seal is rated for continuous service
up to 1,000°F(540°C) in exhaust air applications
only. It is a mat of submicron glass fibers that cre-
ates a seal when compressed between the filter
pack and filter frame. The glass packing is not an
adhesive seal but a mechanical seal that functions
much as the glass fiber medium of the filter itself.
NOTE: Due to the possibility that the glass pack
may shed glass fibers, the glass pack sealant
should be used for exhaust systems only.
Scan Tested HEPA Filters
Each Scan Tested HEPA filter has a minimum effi-
ciency of 99.99% on 0.30 micrometer particles.
Scan testing is in accordance with Section 6.2 of
IEST-RP-CC034.1, HEPA and ULPA Filters Leak
Tests. In the scan test, the filter is challenged with
a high concentration of an approved oil aerosol or
PSL (Polystyrene Latex Spheres). The media pack
and pack-to-frame seal is scanned using a pho-
tometer or particle counter to insure that there are
no leaks greater than .01% of the upstream con-
centration at 100 fpm face velocity. Scan testing is
only available for the 500°F model.
Alpha HT Filter Dimensions and Capacities
CFM CAPACITIES AND DIMENSIONS
Filter Depth
(Inches)
Filter Size and
Frame Depth
Designator
Actual Face
Size (Inches)
CFM Capacity at Clean
Pressure Drop, Inches w.g.
Weight
(Lb.)
.65
1.0
1.35
GG-F
GC-F
YY-F`
YU-F
GN-F
CC-F
24x24
24x12
650
300
615
275
830
135
1000
1300
38
26
37
25
45
14
455
590
11-1/2
23-3/8x23-3/8
23-3/8x11-3/8
24x30
945
1235
550
425
1275
205
1655
265
12x12
Flanders Filters - Foremost in Air Filtration
Toll Free: 1-800-637-2803
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