Envirco NSF Biohazard Cabinet - Manual (Page 24)

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Exhaust Velocity Grid
10448 EBC 47, 4-Ft Type A/B3
Exhaust Velocity Grid
10276, 6-Ft Type A
10451, 6-Ft Type B3
Figure 10: Exhaust Velocity Grid
XIII. POST-INSTALLATION TESTING
Visual Containment Test
After the cabinet has been balanced for proper air velocity readings, it should be
checked with a simple visual smoke test.
1. Hold the smoke source outside the cabinet face opening and make sure
that smoke is pulled into the opening around all four (4) sides. Hold
source three (3) to four (4) inches away from cabinet and scan around the
entire opening.
2. Hold the smoke source inside the work area behind the glass viewscreen
and make sure that no smoke escapes the front opening. Hold source
four (4) inches behind the viewscreen and about 12 inches above the
work deck. Scan cabinet from side-to-side.
3. Hold the smoke source inside the work area along the front to back
centerline of the work deck and about 12 inches above the work deck.
Check the front to back split of the airflow across the work deck near the
center of the cabinet.
4.00” 3.08” 3.08”
4.00”
4.00”
3.58”
Flange of Exhaust Collar Flange of Exhaust Collar