Welded Bevel Seal Frames

Versatile Design

The patented Bevel Seal frame is a factory-welded, extruded aluminum frame developed specifically for High Efficiency Particulate Air (HEPA) filter installations. The modular frames can be quickly bolted together in any combination. Bevel Seal frames are non-directional and can be installed with filter access from either the air-entering or air-leaving side. Standard Bevel Seal frames accommodate 24″ x 24″ gasketed HEPA filters in three thicknesses — 2¾″, 5⅞″ and 11½″. Frames are available for special size filters. The frames are designed to permit installation of adjacent filters at ¾″ intervals. This design feature maximizes the number of filters that can be installed in a given space and reduces resistance due to frame extrusions.

Two-Stage Gasket Compression Prevents Leakage and Ensures Sealing Integrity

The patented Bevel Seal frame features a two-level sealing surface connected by a bevel. This causes the filter gasket to be compressed in two stages as clamping pressure is applied.

If excessive clamping pressure is applied, the individual cells in the gasket material can be fractured, causing the gasket to relax and allowing leakage.

The Bevel Seal frame creates sealing integrity by providing a graduated compression of the sealing gasket. The outer edge of the gasket is compressed to a greater degree than the inner portion of the gasket. Having two levels of gasket compression ensures that an effective seal will be achieved.

By preventing damage in the recessed sealing surface area, two-stage compression preserves sealing effectiveness, should the cellular structure on the outer edge of the gasket be destroyed.

Patented Visual Control Filter Clamps

AAF Visual Control clamps are designed to be used with any conventional gasketed HEPA filter. Located approximately two feet apart, the calibrated, spring-loaded clamps maintain up to 100 pounds of pressure against the filter at each clamping point. Four clamps are used per filter to ensure uniform pressure against the gasket. These clamps have a 1½″ wide bearing surface.

No special tools are required for proper clamp installation. Just 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.

Rugged Construction

HEPA filter installations place great demands on the holding frames. The frames often span large areas, support many filters and accessories, and must be lightweight and easy to install. The frames also must provide a barrier to particulate as efficient as the filters themselves.

Bevel Seal frames are constructed of 6063T5-alloy aluminum extrusions. The channel-edge extrusion at the periphery of each frame is compatible for interfacing with walls, floors, ductwork, and other frames.