Price FFU series Installation And Service Manual page 16

FAN FILTER UNIT
INSTALLATION & SERVICE INSTRUCTIONS
STEP 5
Place FFU top cap assembly onto filter's gasket flange/ frame,
being careful to not damage the filter media.
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FAN FILTER UNIT - Manual | priceindustries.com
STEP 6
Attach filter to top cap assembly by hooking and securing
latches. Gasket may need to be compressed to grab channel
with latch.