Downflow Velocities - Labconco Purifier Logic+ 30132 Technical Manual And Specifications

Downflow Velocities

All Logic+ models, EXCEPT 30248xx80) are classified as having uniform downflow, and
the average downflow velocity for all models is 55+/-5 FPM, tested as per ANSI/NSF
Standard 49:2012.
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 5-4. When taking readings
in the back two rows, the anemometer probe should be pointing toward the nearest side
wall, as shown in figure 5-16. When reading the front row, the probe should point
outward, toward the front of the cabinet, as shown in Figure 5-17. The thermal
anemometer's time constant should be set at 10-15 seconds for greater data stability.
Cabinet Width (Feet)
Sash Height (inches)
Nominal Avg. Downflow
(FPM)
Downflow test grid # of
points
Test Grid (# rows x #
columns)
Test Grid Data (in
inches)
Grid distance from back & sides
Distance between rows
Distance between columns
 - Model #s 30248xx8x Only
Downflow Test Specifications
3 3 4
8, 9 10, 12 8, 9
55+/-5 55+/-5 55+/-5
21 21 24
3 x 7 3 x 7 3 x 8
6.0 6.0 6.0
5.75 5.55 5.75
4.08 4.08 5.21
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4* 4 5
8 10, 12 8, 9
75+/-5 55+/-5 55+/-5
24 24 30
3 x 8 3 x 8 3 x 10
6.0 6.0 6.0
5.75 5.55 5.75
5.21 5.21 5.39
Table 5-4
5 6 6
10, 12 8, 9 10, 12
55+/-5 55+/-5 55+/-5
30 36 36
3 x 10 3 x 12 3 x 12
6.0 6.0 6.0
5.55 5.75 5.55
5.39 5.50 5.50
Figure 5-16
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