Flanders Crank Lock HEPA Filter Housing C-3, Crank Lock HEPA Filter Housing C-4, FFI C-3, FFi C-4 Specification Sheet

®

C-3 and C-4

FOREMOST IN AIR FILTRATION

General

C-3 and C-4 Side Access HEPA/ULPA Filter Housings
are designed for use with nominal 12 inch deep
HEPA/ULPA filters. They are factory-assembled
flanged units suitable for gel sealed or gasket sealed
HEPA filters. Both the prefilters and the primary
HEPA/ULPA filters are serviceable through the same
gasketed side access door.

Versatility

C-3 and C-4 housings may be used with Alpha 95 fil­ters (95% DOP efficiency) and with Alpha Cell and
Alpha 2000 filters (99.97% and 99.99% DOP efficien­cy). Standard housings accept nominal 12 inch deep
filters and 16” and 18” carbon adsorbers in a variety
of face sizes. They can be arranged from one filter
high and one filter wide to four filters high and eight fil­ters wide. If large housings are not practical to rig into
place, smaller units may be stacked in the field.

Options

• Choce of frame construction materials

• Insulation

• Lifting lugs

• Transitions

• Static pressure ports

• DOP test ports

• High temperature modifications

• Weathercap

• Magnahelic gauges (mounted)

• PrefilterTrack

Crank Lock HEPA Filter Housing

Bulletin PB1604-0107

Construction

Housings are 24 inches deep in the direction of air
flow, (26 inches deep if it has a 4” prefilter section.)
and are constructed in your choce of frame materials.
Flanges are furnished for duct connections on the air
entering and air leaving sides. All joints are intermit­tently welded and finished to remove all burrs and
sharp edges. The joints are then sealed with silicone
enabling the housing to withstand an internal pressure
of +/- 3.0 in. w.g.

The filter locking mechanism for the fluid gel seal­model housing is a 300 Series stainless steel hand­operated arm that moves the filter s gel-filled channel
on to the internal housing knife edge sealing flange.
The same mechanism also pulls the filter away from
the sealing flange when changing filters. The filter
locking mechanism for gasket seal-model housing is a
300 Series stainless steel and brass device. The
mechanism presses the gasketed filter against the
housing s sealing surface by means of a mechanical
bolt and thrust assembly that is manually operated
using a standard 3/4 inch socket or wrench.

Standard 2 inch or 4 inch prefilter tracks will accom­modate pleated panel filters with efficiency ranges up
to 50% per the ASHRAE Standard 52.2 dust spot test
methods. Access doors have 0.5 in. thick closed cell
neoprene gaskets around the inside perimeter.
Double pin door hinges which pivot, allow the door to
make level contact with the gasket when closed.
Stainless steel wing nuts secure the doors.

Important Features

• Choice of frame construction materials

• Stainless steel filter locking mechanism for
strength, durability and long-term integrity

• Access for up to four filters and prefilters wide
per door for quick filter changeout

• Double pin hinges enable the doors to make
level contact with the door gasket for a uni­formly tight seal

Flanders Filters - Foremost in Air Filtration

Toll Free: 1-800-637-2803

Cfm Capacities and Dimensions

Using Standard Alpha 95 and Alpha Cell and High Capacity Alpha 2000 HEPA Filters

Face Width Code
Height Velocity 1W 2W 3W 4W 5W 6W 7W 8W
Code (fpm) CFM Capacity

1H 500 1000 4000 6000 8000 10000 12000 14000 16000

275 1100 2200 3300 4400 5500 6600 7700 8800
375 1500 3000 4500 6000 7500 9000 10500 12000
500 2000 4000 6000 8000 10000 12000 14000 16000

2H 500 4000 8000 12000 16000 20000 24000 28000 32000

275 2000 4000 6000 8000 10000 12000 14000 1600
375 3000 6000 9000 12000 15000 18000 21000 24000
500 4000 8000 12000 16000 20000 24000 28000 32000

3H 500 6000 12000 18000 24000 30000 36000 42000 48000

275 3000 6000 9000 12000 15000 18000 21000 24000
375 4500 9000 13500 18000 22500 27000 31500 36000
500 6000 12000 18000 24000 30000 36000 42000 48000

4H 500 8000 16000 24000 32000 40000 48000 56000 64000

275 4000 8000 12000 16000 20000 24000 28000 32000
375 6000 12000 18000 24000 30000 36000 42000 48000
500 8000 16000 24000 32000 40000 48000 56000 64000

1. Height and Width code: the first numeral represents the number of 24 in. x 24 in. filters high and wide. See also
Model Number Development on page 3.

2. Standard housing depth is 23-1/4 inches with or without an optional prefilter track.

3. Housings greater than four wide must have filter removal from both sides.

4. Capacities shown are based on nominal 12 inch deep filters.

Gasket Seal

Gasket

A spring-loaded filter clamping
mechanism is used to maintain seal­ing pressure for gasketed filters. The

gasket seal is suitable for many

applications.

C-4C-3

Gel Seal

Housing

Knife Edge
Sealing Flange

A flange in the housing mates into a

gel-filled channel on the filter. The

gel seal guarantees filter-to-frame

sealing and is recommended for

critical applications.

Flanders Filters - Foremost in Air Filtration

Toll Free: 1-800-637-2803