Labconco PURICARE Procedure Station Models 34812xx - Manual (Page 74)

Page 74 of 197
Downflow Velocities
All Logic models are classified as having uniform downflow, and the average downflow
velocity for all models is 55+/-5 FPM, tested as per ANSI/NSF Standard 49:2007.
All readings should be in a plane 4 inches above the bottom edge of the sash, and the
UV Lamp, IV bar and all other accessories must be removed before performing
downflow test. The test grid dimensions are outlined in Table 5-2. When taking readings
in the back two rows, the anemometer probe should be pointing toward the nearest side
wall, as shown in figure 5-13. When reading the front row, the probe should point
outward, toward the front of the cabinet, as shown in Figure 5-14. The thermal
anemometer’s time constant should be set at 10-15 seconds for greater data stability.
Table 5-2
Downflow Test Specifications
Model 34308 34300 34408 34400 34508 34500 34608 34600
Nominal Avg. Downflow
(FPM)
55+/-5 55+/-5 55+/-5 55+/-5 55+/-5 55+/-5 55+/-5 55+/-5
Downflow test grid # of
points
21 21 24 24 30 30 36 36
Test Grid (# rows x #
columns)
3 x 7 3 x 7 3 x 8 3 x 8 3 x 10 3 x 10 3 x 12 3 x 12
Test Grid Data (in
inches)
Grid distance from back &
sides
6.0 6.0 6.0 6.0 6.0 6.0 6.0 6.0
Distance between rows 5.75 5.55 5.75 5.55 5.75 5.55 5.75 5.55
Distance between columns 4.08 4.08 5.21 5.21 5.39 5.39 5.50 5.50
Figure 5-13