Filtered inflow and emergency HEPA exhaust during asbestos remov

Details Filtered inflow and emergency HEPA exhaust during asbestos remov Filtered inflow and emergency HEPA exhaust during asbestos remov

1989-09-14

1991-03-05

Walsh, Donald P.

Gas separation

Means within gas stream for conducting concentrate to collector

55309, 55493, B01D 4600

Patent

active

H00008958

ABSTRACT:
In asbestos abatement or decontamination work, negative pressure is established within a work area, and air entering the work area in response to the negative pressure is caused to pass through or past a HEPA filter in an air inlet to the work area. If the negative pressure within the work area ceases, as in an emergency situation, any air exiting the work area through the air inlet is caused to pass through the HEPA filter. This may be accomplished by pivotally mounting the HEPA filter for rotation about a horizontal axis so that it moves out of the way of inflowing air, while outgoing air must pass through the filter. Alternatively, a fan may also be mounted in the air inlet and may be operated in response to pressure within the work area, so that when a negative pressure condition exists within the work area the fan is operated to force air into the work area through the HEPA filter, while if the negative pressure condition terminates, the fan is turned off, so that any air exiting through the inlet must pass through the HEPA filter.

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