Envirco NSF Biohazard Cabinet Manuel d'utilisateur télécharger pdf (Page 24)

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

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Envirco NSF Biohazard Cabinet Manuel d'utilisateur Page 24