Abstract: A multi-part cabinet enclosing a high efficiency particulate air filter and a blower for moving air therethrough positions the filter in a first part of the cabinet and sealingly connects it with a second part of the cabinet in which the blower and its motor are located. A third part of the cabinet encloses the first part and provides a screened access opening so that air to be filtered can enter the third part of the multi-part cabinet and flow therefrom through the high efficiency particulate air filter in the first part of the cabinet and from the filter into the second part of the cabinet and the blower therein, the second part of the cabinet being provided with a screened air exit, the first part of the multi-part cabinet being permanently sealingly attached to the second part of the multi-part cabinet. The interconnection of the first, second and third parts of the multi-part cabinet positively prevent air leaks which adversely affect the efficiency of the high efficiency particulate air filter.

Abstract: A satellite pre-filter cabinet positions replaceable air filters in an area in which air polluting harmful industrial dusts, including friable asbestos and/or fumes and gases are present and must be removed. The satellite air filter cabinet is connected to negative air pressure devices and filters remotely situated as for example outside of the polluted area.