FAN FILTER UNIT - HIGH EFFICIENCY
INSTALLATION & SERVICE INSTRUCTIONS
STEP 3:
Insert aerosol test fitting or adaptor (the aerosol injection port has a 3/8” NPT internal thread) into ATS test port.
NOTE:
An adaptor/test fitting that is longer than 1.5” and/or wider than 1” will not fit.
STEP 4:
Inject aerosol test agent and measure particulate counts according to local codes.
NOTE:
Static pressure port can be used to measure upstream particle counts. Refer to page 41 for static pressure port details.
STEP 5:
Disconnect test equipment, and reinstall plugs in the static pressure (if applicable) and aerosol injection ports. Reinstall
diffuser face (if applicable).
If the safety cables were also disconnected when removing the face, they must be reattached. When reinstalling the face, care
should be taken to tuck safety cables in place without damaging the filter.
NOTE:
Airflow and aerosol challenge concentration should be kept uniform during the test. Static pressure and concentration may
be sampled through the static pressure port during the test, if required, to verify flow and concentration.
The following table outlines a few possible problems that may be encountered during leakage testing. This chart is intended as a
quick troubleshooting guide, and is not exhaustive. All local and applicable codes should be followed.
Problem
Possible Cause
Solution
Leakage at the perimeter of
the filter
Improper filter installation
Gently remove the filter, verify that the gel seal is intact and undam-
aged, and carefully reseat the filter in the knife edge frame and latch
in place.
Pinhole leaks detected in filter
Improper handling of filter/dam-
age during installation
Filter may be repaired by a trained technician.
Leakage at the perimeter of
the fan filter unit
Improper seal between unit and
ceiling plenum
Check seal between unit and ceiling plenum and seal as required.
Particle Counter is beeping at
multiple locations, even away
from filter face
Possible leakage through ad-
jacent lights, diffusers, and/or
ceiling panels
Isolate unit by placing cardboard or sheet metal to create vertical
'walls' extending 2ft below the ceiling plane. If filter passes, sealing
of adjacent lights, diffusers, and/or ceiling panels may be required.
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