AAF International Front Access Housings - Manual (Page 7)

Each individual FAH is specifically designed to accommodate and
securely seal AAF s gas phase chemical filter cassettes. Each housing
incorporates a unique, patent pending, filter sealing system to ensure that
the contaminated air passes through the filter and does not by-pass the
system. Each FAH is supplied complete with four (4) sealing and locking
channels as illustrated. The locking handle support tabs are shipped
installed on the FAH-(202)(201)(102)-2P-MD and FAH-(202)(201)-2P-HD
housings, but ship loose with the FAH-(202)(201)-2P-CG and the
FAH-102-2P-HD housings for installation after the gas phase filters have
been inserted into the housing (see illustration bottom page 6).
3.4 General Filter Bank Erection Procedure
CAUTION
The maximum number of Front Access Housings that may be
stacked vertically without intermediate supports is four high. There
is no limit to the width of a built-up filter bank.
After removing the Front Access Housings from the cartons, prepare
to arrange and stack the individual housings to form the filter bank
shown on the AAF submittal drawing and in Figure 1 below.
To ensure that the erected frame is properly sealed to prevent by-pass
of air around the filters, it is important to comply fully with the following:
3.4.1 Support Surface: The support surface under the base of the
frame shall be level, smooth, clean, and dry. The location shall be
protected from the weather and shall not be subject to wetting or flooding.
3.4.2 Caulking and Sealing: Caulk generously beneath, between,
and around the Front Access Housings as shown in Figures 1 and
3. Locate the lines of caulk as shown and as follows:
Two (2) unbroken transverse lines between horizontal and vertical
rows, across the entire width of the filter bank at each level
beginning at the support surface.
One orthogonal line of caulk across the full depth of the frame at
any point where the side panel of the FAH joins to the top or bottom
of the housing forming a corner that connects to a similar corner on
another housing. Such joints will occur at the connections between
the support base and the lowest tier of housings, any two perimeter
housings, or any four internal housings.
Caulk all seams on the face of the filter bank on the air leaving side.
Provision of the caulk will be the responsibility of the installer or
others. This item will not be supplied by AAF unless noted
specifically in the AAF quotation and in the accepted customer
purchase order. The caulk to be used shall be a long life, flexible,
non-drying caulking material. The caulk supplier shall ensure that
the caulk shall meet the customer specifications for the application
in which it is being used.
CAUTION
Many installations prohibit the use of certain caulking materials
such as Silicone. The use of materials containing VOCs should
also be avoided as they may have a negative effect on the life
of the gas phase filters.
Figure 1
TYPICAL CAULKING DETAIL TO PREVENT UNFILTERED AIR BY-PASS
AAF s Patent Pending
SAAF Seal High Integrity
Sealing System
Caulk Face Joint Fully (Caulk Supplied by Others)
Caulk Orthogonal Joint Fully (Caulk Supplied by Others)
Caulk Transverse Joint Between Frames as Shown to Prevent By-pass
(Caulk Supplied by Others)
2
[50mm]
4
[100mm]
Bearing Surface Shall be Level and Smooth
Caulk Seal at Floor Level
(Caulk Supplied by Others)
Airflow
7