Powerful 3/4 HP motor generates exceptional, consistent flow rate and utilizes all filter media area. 2 speed motor provides consistent air flow of 1000dfm (high speed) and 500 (low speed). 8 point motor/cage mounting prevents motor and cage shifting under the harshest conditions. Seamless construction guarantees leak proof operation. Lightweight design with incorporated skids allow for easy and safe transport. Positive lock filter prevents filter movement for uninterupted filtration. Uses standard 16" X 16: H.E.P.A. filters. General Purpose filters and Audible Alarms are also available.