®
Surelock-B
Bolt Lock HEPA Filter Housing
F O R E M O S T I N A I R F I LT R AT I O N
Bulletin PB1603-1206
General
Construction
Surelock-B Side Access HEPA Filter Housings are
designed to accept all gasket-seal HEPA filters. They
are all-welded factory-assembled flanged units suit-
able for installation in a duct on the downstream side
of an air handling unit.
Housings are 27 in. deep in the direction of air flow
and are constructed of 14 ga. galvanized steel.
Upstream and downstream outwardly-turned flanges
are furnished for attachment to the ductwork. Each
HEPA filter is secured in place by four positive-
pressure spring-loaded swing-arm assemblies which
maintain continuous pressure on the filter gasket
against the sealing surfaces.
Housings guarantee filter system efficiency equal to
the efficiency of the individual filters. Optional prefilter
tracks are designed to accommodate 2 in. pleated
panel filters with efficiency ranges up to 50% per
ASHRAE Standard 52.1 dust-spot test methods. Both
prefilters and primary HEPA filters are serviceable
through gasketed access doors.
Optional prefilter tracks are galvanized steel furnished
with a pile gasket. Hinged/removable access doors
are furnished with rubber sealing gaskets and posi-
tive-pressure adjustable latches with easy-grip knobs
on the air entering and the air leaving sides to create
an airtight seal. Metal-to-metal joints are welded to
ensure a leak-proof assembly at + 8 in. w.g. internal
pressure.
Options
• Prefilter tracks
• Double-walled insulation on doors only or on the
entire housing
Versatility
• Aluminum or 304 stainless steel housing
construction
Surelock-B Housings are designed to accommodate
Alpha 95 filters with a DOP efficiency of 95% and
Alpha Cell and Alpha 2000 filters with DOP efficien-
cies of 99.97%, 99.99% and 99.999%. Standard
housings will accept nominal 12 in. deep 24 in. x 24
in. and 24 in. x 12 in. filters from one filter high and
one filter wide to four filters high and six filters wide. If
large units are not practical to install, smaller units are
available with modifications to facilitate stacking.
• Modifications for high temperature (400 °F continu-
ous, 500 °F intermittent duty)
• Swing-arm assemblies for 6 in. deep HEPA filters
Important Features
• Units are constructed of durable 14 ga.
galvanized steel
• All metal-to-metal joints are welded for
leak-tightness at + 8 in. w.g. internal pressure
• Prefilter tracks and doors are fully gasketed
• Positive-pressure adjustable door latches
create an air-tight seal
• Spring-loaded swing-arm assemblies hold
HEPA filters to sealing surface
• Access doors are hinged/removable for easy
service
Flanders Filters - Foremost in Air Filtration
Toll Free: 1-800-637-2803
1
A
Surelock Features
B
A. 14 ga. galvanized steel construction
B. 1-1/2 in. easy-grip UV-resistant
knobs on positive-pressure
adjustable door latches
C
C. Hinged/removable doors
D. Optional 2 in. pre-filter tracks
E. All metal joints welded
F. Filter sealing surface
D
E
F
A
A. Standing flange for duct connection
B. Spring loaded swing-arm filter clamping assembly
B
Filter Usage and Housing Weight
Height Filters
Code Weight
(lb)
Width Code
10W
15W
--
20W
25W
--
30W
35W
40W
45W
--
50W
--
55W
--
60W
--
05H
10H
15H
20H
25H
30H
35H
40H
Filters
Weight
Filters
Weight
Filters
Weight
Filters
Weight
Filters
Weight
Filters
Weight
Filters
Weight
Filters
Weight
1C
110
2C
140
2A
3C
160
3A
-
4C
180
1A
1A-1C
205
--
2A-1C
275
--
3A-1C
332
--
4A
4A-1C
385
--
5A
408
5A-1C
465
--
6A
510
165
1A-1C
185
2A
240
2A-2C
250
4A
300
3A-3C
310
6A
360
4A-4C
390
5A-5C
450
6A-6C
560
2A-2C
250
--
4A-2C
318
--
6A-2C
395
--
8A
8A-2C
446
--
10A
10A-2C
546
12A
215
2A-1C
225
3A
267
4A-2C
318
6A
350
6A-3C
370
9A
410
475
615
8A-4C
500
10A-5C
565
--
12A-6C
712
3A-3C
312
--
6A-3C
392
--
9A-3C
470
--
12A
506
12A-3C
545
15A
15A-3C
600
18A
270
3A-1C
282
4A
350
6A-2C
385
8A
435
9A-3C
470
12A
555
585
742
12A-4C
612
--
15A-5C
765
--
18A-6C
945
4A-4C
392
8A-4C
502
12A-4C
612
16A
670
16A-4C
758
20A
20A-4C
922
24A
340
446
845
985
(1) Filters/Weight: Top letter/number combination indicates the number of and nominal face size of filters required
to fill the unit. “A” stands for nominal 24” x 24” filter. “C stands for nominal 24” x 12” filter. Bottom number indi-
cates the approximate weight of the housing EMPTY. Add approximately 32 lb per 24 in. x 24 in. filter and 15 lb
per 24 in. x 12 in. filter plus 2 lb per prefilter to determine approximate weight when loaded with filters.
• Standard housing depth is 12”
Flanders Filters - Foremost in Air Filtration
Toll Free: 1-800-637-2803
3
1. Standard construction: All-welded 14 gauge (.078 in.) galvanized steel housing and doors, leak -tight at + 8 in. w.g.
2. Flange dimensions are typical for both top and bottom of openings.
3. Each HEPA filter is individually secured and clamped in place with four spring-loaded swing arm assemblies.
4. Maximum operating temperature for standard Surelock Housings is 250 °F. High temperature Surelock housings are avail-
able for 400 °F continuous and 500 °F intermittent duty. These units are furnished with silicone sponge gasketing on the
doors and stainless steel springs on the swing arm assemblies.
Guide Specifications
1.0 Filter Housings
2.3 Each HEPA filter shall be secured in place with
four spring-loaded swing-arm assemblies to pro-
vide positive sealing of the HEPA filter to the
mounting surface.
1.1 Side access HEPA filter housings shall be
Surelock-B as manufactured by Flanders.
1.2 Unit shall be a factory-assembled air-tight housing
with upstream and downstream outwardly-turned
flanges for installation in the ductwork.
2.4 Access doors shall be hinged/removable and shall
have continuous neoprene gasketing on the
perimeter. They shall be equipped with positive-
pressure adjustable latches with easy-grip knobs.
1.3 Housings shall be suitable for operation + 8 in. w.g.
internal static pressure.
3.0 Features
2.0 Construction
3.1 Model number and capacities shall be as specified
and/or shown on the drawings.
2.1 Housing construction shall be of 14 ga. galvanized
steel. Metal-to-metal joints shall be welded.
3.2 Provide options as specified.
2.2 Prefilter tracks, if required, shall be galvanized
steel and incorporate a pile gasket to ensure seal-
ing of the filter to the track.
®
REPRESENTED BY:
Flanders Filters, Inc.
531 Flanders Filter Road
Washington, NC 27889
Phone: (252) 946-8081
Toll Free: (800) 637-2803
Fax: (252) 946-3425
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