AAF International SAH - Manual (Page 14)

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Step 1: Insert the high efficiency M-Pak filter into the track.
Step 2: The installed high efficiency M-Pak filter.
3.9 High Efficiency Final Filter Installation: A high efficiency final
filter bank is often required to ensure that the filtered air meets the
highest levels of particulate cleanliness. The standard Side Access
Housings are designed to accept a 6" deep single header final filter only.
For best results AAF recommends the use of one of its line of single
header M-Pak high efficiency filters. The tracks are spaced and sized to
accept 24" x 24", 12" x 24" and 24" x 12" nominal ASHRAE style filters.
If a final filter is provided with the system, place the high efficiency
final filter into the filter track with the pleats arranged vertically.
However, it may be necessary when installing some half-size filters
to arrange the pleats horizontally.
Repeat the process of high efficiency filter installation until all tracks
are filled with high efficiency filters.