Labconco Purifie Horizontal Clean Benches 38185 Series, 8' User Manual
Page 32
Chapter 6: Maintaining Your Clean Bench
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Original Instructions
1. Remove the prefilters as described on page 24.
2. Locate the speed control. It is to the left of the blower on 3-foot and 4-foot
models, and between the blowers on the 5-foot, 6-foot & 8-foot models.
3. Using a medium-sized, straight blade screwdriver turn the speed control screw
clockwise to decrease the blower speed as shown in Figure 6-2.
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.
Figure 6-2