Labconco Purifie Horizontal Clean Benches 36125 Series - Manual (Page 52)

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Chapter 6: Maintaining Your Clean Bench
4. After completing the speed control adjustment,
establish the average air velocity, using a calibrated
thermal anemometer with an accuracy of ± 3%.
Establishing a boundary of 6 inches from the sides,
top and bottom, measure the velocities in 6-inch
increments, 6 inches in front of the diffuser. This
methodology is more fully defined in the IEST
recommended practice #IEST-RP-CC0002.2
5. The average velocity should be 90 ± 10 FPM, with
all measured values falling within ± 20% of the
average.
6. Reinstall the prefilters.
Diffuser Removal:
1. Locate and remove the diffuser screws, shown in
Figure 6-3. Pull the diffuser straight out.
Figure 6-2