The performance of different Class II cabinets is distinctly different when considering filtration, ventilation, air exchange, and airflow.
Test Result Summary
Toluene vapor test results illustrate distinctly different vapor return patterns for each cabinet type
Cabinet Type | Test Result |
---|---|
Type A Cabinet | Vapor concentrations in the downflow air reached a constant value which did not significantly change as the vapor generator was moved from front to rear of the work surface. |
Type B1 Cabinet | Significant changes occurred as the vapor generator was moved from front to rear of the work surface. With the generator placed in front, the amount of returned vapor paralleled the performance of the Type A cabinet. With the generator placed in the rear, returned vapor paralleled performance of the 100% total exhaust cabinet (Class II, Type B2). The downward curve illustrates the variance in vapor concentration related to location from front to rear. |
Type B2 Cabinet | In the 100% total exhaust cabinet, no air is recirculated and all vapor was removed. |
Type A2 Cabinet | Vapor concentrations in the downflow air reached a constant value which did not significantly change as the vapor generator was moved from front to rear of the work surface. |