Krueger | 1401 N Plano Rd | Richardson, TX 75081 | 972.680.9136 | [email protected] | www.krueger-hvac.com
Installation, Operation, & Maintenance for CRFF-E Series
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Testing
Each CRFF-E series unit is thoroughly tested at the factory
before shipment. However, because of the “rigors” of
shipping, Krueger encourages its re-test after installation.
Additional, for large installations it is recommended to
bench test 5% of the units prior to installation.
Krueger recommends that the customer contact an
independent organization, with technicians trained and
experienced in performance evaluation and maintenance
of clean air equipment.
Some of the testing procedures performed on the CRFF-E
series units include PSL challenge of HEPA/ULPA filters
to assure specified performance, along with air velocity
measurement and adjustment tests. No DOP is used on
CRFF-E series filters, unless requested
Recommended Testing
All units that are airflow tested at Krueger are tested using
a Shortridge Airdata Multimeter 800 series with a Velgrid
head. The recommended method of reading is to place
one corner of the Velgrid head 1-1/4” from the corner of
the filter face and then take four reading evenly spaced
along the four foot side, and then repeat these reads for
the other long side. This gives a total of eight reading to
test the unit. All advertised data is based on using the
Velgrid with eight readings (128 velocity points). Krueger
recognized using eight reading during a cleanroom start-
up may be time consuming and recommends using three
Velgrid readings taken on a diagonal, as shown below.
FIGURE 17: RECOMMENDED TESTING – 8 POSITION READINGS WITH A VELGRID
FIGURE 18: FACTORY APPROVED TESTING – 3 READINGS WITH A VELGRID
Summary of Contents for CRFF-E
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