OM0284
Page 49 of 72
Rev 2 July/2021
Table 7.0
Recommended Measurement Methods for Cabinet Downflow and Inflow
Downflow Measurement
A. Instruments: TSI 8355 Thermo anemometer
B. Procedure:
Supply filter efflux is measured on a grid, in a horizontal plane 4 inches (102mm) above the bottom edge of the window.
Measurements should be taken over a period of at least 1 minute for each position.
C. Test Data - Inches (mm):
300E
4.297 (109)
12.891 (327)
21.485 (546)
30.078 (764)
400E
5.797 (147)
17.391 (442)
28.985 (736)
40.578 (1031)
500E
7.297 (185)
21.891 (556)
36.485 (927)
51.078 (1297)
600E
8.797 (223)
26.391 (670)
43.985 (1117)
61.578 (1564)
6.31 (160)
18.93 (481)
Number of Readings:
Average Velocity
ft./min. m/s
D. Acceptance Criteria:
1. Average downflow velocity =
60 LFPM
5 LFPM (.30 m/s
.025 m/s)
2. Individual readings must be 20% of the average downflow velocity
_____ to _____ fpm (_____ to _____ m/s)
B. Inflow Measurement
a. Recommended Instrument: Shortridge Flowhood ADM-870 or TSI 8355 Thermo anemometer.
b. Primary Procedure:
The primary procedure to determine inflow velocity uses a Direct Inflow Measurement (DIM) Instrument (i.e.
Shortridge flowhood). The DIM Instrument can be used directly on the cabinet with NO CORRECTION FACTORS
REQUIRED if operated in the local density default mode. NSF has tested the cabinet and established listed air
velocities. Use duct tape to secure the DIM Instrument to the cabinet preventing any sneak air paths from occurring.
The DIM Instrument will read inflow volume (i.e. CFM). Use the window access opening area to calculate inflow
velocity.
Содержание LabGard NU-543-300E
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