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1.
Locate the single row of holes at the front of the grille. Mark the 6
th
hole from
the side wall and subsequent test points every 9 holes until the number of test
points marked equals the width of the cabinet in feet (for a 3-foot cabinet, for
example, mark the first 3 points). Repeat for the opposite side, as shown in
Figure 5-21.
2.
Start the Purifier, and let it operate for at least 5 minutes. Establish the
necessary correction factor to the thermal anemometer to ensure compliance
with its performance in a calibrated wind tunnel. This data should be available
from the calibrator of the thermal anemometer.
3.
Calculate the manufacturers recommended correction factor(s) to correct for
local conditions of temperature, humidity, barometric pressure, altitude, etc.
4.
Take a series of inflow velocities by placing the probe holder so that its center
mark aligns with the marked test holes. As shown in Figure 5-22.
5.
Apply the wind tunnel correction and local condition correction factors to the
thermal anemometer readings.
6.
Multiply the individual readings by the correction factor shown in Table 5-6.
7.
Average the corrected readings.
8.
The resulting value is the inflow volume in cubic feet per minute (CFM). In order
to convert this value to the average inflow velocity of feet per minute (FPM),
divide the volume by the sash open area given in Table 5-6. The resulting value
will be the calculated average inflow velocity in FPM.
Figure 5-21
Marking the test point locations.
Mark the 6
th
hole from either end, then mark every
9
th
hole until the number of marked points equal
the width of the cabinet in feet.
Repeat for the other side of the grille.
Figure 5-22
Measuring the Secondary Inflow Velocity.
Note the center of the probe holder aligns with the
test points marked earlier.
Acceptance
Average inflow shall meet the specification in Table 5-6.
