Importance

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Abstract

A filtration device for filtering airborne contaminants, such as airborne asbestos fibers, from the air, including a housing having an inlet for receiving contaminated air, an outlet for expelling filtered air outside of the housing, a filter, including a HEPA filter, in sealed communication with the inlet, and a blower within the housing for drawing air through the filter means and for expelling the filtered air through the outlet to the outside of the housing. A control and display system continuously senses differential air pressure within the housing and blower speed, converts the differential air pressure and blower speed to an air flow rate value and displays the air flow rate through a display unit. Manually controllable key pad switches are provided to selectively change the desired air flow rate, to set upper and lower pressure limit values, and to set the operating time for the system operation. When the system is set to operate at an air flow rate below the maximum air flow rate, the system automatically and continuously maintains the air flow rate at the selected value.

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First Claim