with your AAF representative to obtain an appropriate product. Also,
before blowing down the system, check that it is safe to operate the
fan without the pressure load of the gas phase chemical filters.
Consult the AAF submittal drawing for pressure information.
3.6 Gas Phase Chemical Filter Installation: The following
instructions are specific to the installation of the MD gas phase
chemical filter cassettes into the appropriate FAH-XXX-2P-MD filter
frame. Unless specifically mentioned otherwise, the procedure for
installing the HD and CG cassettes will be exactly the same.
3.6.1 Check the Gaskets in the Face of the Front Access
Housings: Before proceeding with installation, inspect the gaskets
located in the face of the housings to ensure that they have not
been damaged or become loose during installation and cleaning.
Correct any problems.
3.6.2 Prefilter Locking Tabs:
Ensure that the pre-filter
locking tabs are in the open
position before proceeding.
See the detail at right.
3.6.3 Preparing the Cassette for Installation: Remove the cassette
from its carton and plastic bag. You may notice that
each cassette or half
cassette is
accompanied by
a plastic bag
containing loose
gaskets (see
right). These are
supplied for use
when the cassette
is being installed
into an AAF Side
Access Housing (SAH)
and are not required for
installation into
the FAH frame
bank. DISCARD
THESE
GASKETS.
3.6.4 Handling of the Cassette: The AAF SAAF Cassette is
designed to be sturdy and to support a significant weight of chemical
media. However, it should not be handled roughly. The cassette
should always be lifted with two hands, one beneath each side
panel as shown in the following installation pictures. The cassette
should never be lifted, supported, or carried by a single side panel.
3.6.5 Installation of the Cassette in the FAH: Install the cassettes
as shown in the sequence below starting with the bottom cassette.
The bottom cassette rests on the lower panel of the FAH housing.
Subsequent cassettes are supported on tracks. Slide each half-cassette
into the FAH and push it firmly against the gasket that is located in
the face of the housing. Repeat this process until all of the tracks in
the FAH have been filled.
Step 1: Insert the filter into the FAH.
Step 2: Slide the filter into the FAH.
Step 3: Push to engage the gasket in the face of the FAH.
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