Testing
Each fan filter unit is thoroughly tested at the factory before shipment. However, many codes and standards
require testing for bypass leakage after installation. The manufacturer encourages that the customer contact
an independent, certified testing organization with technicians that are trained and experienced in performance,
evaluation, and maintenance of clean air equipment.
The manufacturer recommends at least 30 minutes elapse after HEPA/ULPA filter installation before performing
any type of challenge leak testing. The unit should be sealed to the ceiling and the room should have a positive
pressure held during testing and normal operation.
Trouble Shooting
Low Airflow
x
If optional red HEPA-lert LED light is on, replace the HEPA filter.
x
Inspect the pre-filter. Clean or replace as necessary.
x
Adjust the digital speed control for higher airflow output.
x
Check the power supply for proper voltage, amperage, and distribution frequency
x
Verify dip switches are correct for type of controls used.
x
Replace HEPA filter if airflow remains low.
High Airflow
x
Adjust digital speed control for lower output.
x
Verify dip switches are correct for type of controls used.
Non-Laminar Airflow and/or Excessive Contamination
x
Ensure that upstream airstream is clear of large obstructions.
x
Ensure that no other air moving devices are operating in such a way to disrupt the room’s airflow pattern.
x
Check airflow and if not desired airflow see above.
x
Conduct smoke or photometer test on HEPA filter and gel seal. Seal or replace the HEPA filter as necessary.
DRAWING NAME
DRAWN
CATEGORY
CHKD
APRVD
PRODUCT
SIZE
TAG
QTY
BRS/SLG
06/13/22
CRITI-CLEAN ULTRA INSTALLATION MANUAL
SSLFHFD-FFU-RF-MEA
REV # F
SHT 24 27
/
SCL
DO NOT
SCALE
1:10
STAINLESS STEEL
CRITI-CLEAN ULTRA
REVERSE FLOW - FAN FILTER UNITS
