JOHNSON CONTROLS
104
FORM 102.20-N1
ISSUE DATE: 7/06/2016
SECTION 3 - HANDLING, STORAGE, AND INSTALLATION
LD20623
FIGURE 166 - KOCH HF
Welded Bevel Seal Frame
Extruded Aluminum Frames
The bevel seal frame is a factory welded, extruded alu-
minum frame developed specifically for High Efficien-
cy Particulate Air (HEPA) filter installations. Standard
bevel seal frames accommodate multiple sizes of gas-
keted HEPA filters 11-1/2 in. deep as shown in Figure
165 on page 104.
Two Stage Gasket Compression
The bevel seal frame features a two level sealing surface
connected by a bevel, which causes the filter gasket to
be compressed in two stages as clamping pressure is
applied. The outer edge of the gasket is compressed to
a greater degree than the inner portion of the gasket, as
shown in Figure 168 on page 106.
Do not apply excess clamping pressure
because the individual cells in the gasket
material may fracture, causing the gasket
to relax, allowing leakage.
FIGURE 167 - HEPA FILTER (CROSS SECTION)
LD06674a
2 in
2 in
2 in
T-Section
Perimeter Section
Type H
Main Runner
Perimeter Extrusion
VISUAL CONTROL FILTER CLAMPS
HEPA Filter Applications
Visual control clamps, as shown in Figure 166 on page
105, are designed to use with any conventional gas-
keted HEPA filter. Located at midpoint of each filter
edge, the calibrated spring-loaded clamps maintain up to
100 lb pressure against the filter at each clamping point.
Four clamps, which have a 1-1/2 in. wide bearing sur-
face, are used per filter to assure there is uniform pres-
sure against the gasket.
Installing the Easy Clamp
No special tools are required to install the clamp prop-
erly. Tighten the bolt head until it is flush with the
clamp face to achieve the prescribed compression.
Proper clamping pressure is created indefinitely by the
calibrated spring.
Single filter clamps are used around the perimeter of the
frame bank. Double clamps are used along main runners
to secure a filter on either side of the T-section as shown
in Figure 166 on page 105.
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