Titus FFD/FFDR/FFDRA - Manual (Page 16)

I N S T A L L A T I O N & O P E R A T I O N M A N U A L
FFD, FFDR, FFDRA Models
Fan Filter Unit IOM
Installation & Operation
Testing
Each fan filter unit is thoroughly tested at the factory before shipment. However, because of the “rigors” of
shipping, Titus encourages units are re-tested after installation.
Titus recommends that the customer contact an independent organization, with technicians trained
and experienced in performance evaluation and maintenance of clean air equipment.
HEPA filters (Type J) are tested to IEST-RP-00034. ULPA filters are tested to (Type F) IEST-RP-00034. All filters
are UL 900 recognized. Your filters may have special requirements, please see original engineering specifications
for you specific project.
All units that are airflow tested at Titus are tested using a Shortridge Airdata Multimeter 870 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, then repeat these reads three
additional times. This gives a total of 8 reading to test the unit. All advertised data is based on using the Velgrid
with 8 readings (128 velocity points). Titus recognized the using 8 reading during a cleanroom start-up may be
time consuming and recommends using 4 Velgrid readings taken on each 2x2 filter section will approximate the
same as 8 readings.
Recommended Testing – 8 readings with a Velgrid
Additional independent testing on the Titus fan filter units show that using one-2x4 or two-2x2 hoods
simultaneously give airflow data (cfm) with 5 percent of a duct traverse using 10 diameters of straight duct
upstream of the fan intake.
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Recommended Testing – 8 readings with a Velgrid