AAF International PRU - Manual (Page 10)

10
Type HD half-cassette with butterfly and side gaskets.
Step 1: Remove the paper strip on the back of the black gasket to expose the adhesive.
Step 2: Locate the gasket on the leaving air side of the half-cassette along the edge of
the cassette side plate. A gasket location guide has been formed into the side plate.
The gasket should be located to the outside of this line.
Step 1: Remove the paper strip on the back of the yellow “butterfly-style” face gasket to
expose the adhesive.
Step 3: Firmly press the gasket into position so that it adheres to the side plate.
Step 4: Repeat to install the second side gasket on the other side of the half-cassette.
Butterfly-style Face Gaskets
3.7 Gas-phase Chemical Filter Installation: The following instructions
are specific to the installation of the HD gas-phase chemical filter
cassettes into an RU housing. Typically, two stages of gas-phase
filtration will be supplied in any RU, a lower filter bank and an upper
filter bank. The instructions for installing the gas-phase filters will be
identical for both banks.
3.7.1 Preparing the Cassette for Installation: Remove the
cassette from its carton and plastic bag. You will notice that each
half-cassette is accompanied by a plastic bag containing loose
gaskets (see right). These are supplied specifically for use when
the cassette is to be installed into the RU. These gaskets are critical
for the sealing of the gas-phase cartridges to prevent by-pass of
contaminated air around the filters.
First, completely remove any dust that may have settled on the
outer surface of the plastic cassette during shipping and handling.
If not removed, such dust may interfere with the adhesion between
the gaskets and the plastic cassette. Install the gaskets onto the
half-cassettes. The following pictures show the installation of
gaskets onto a Type HD half-cassette:
Side Gaskets