DESC: The JDS 750JE filtration system will remove 99 percent of dust particles as small as 5 microns and 80 percent of particles as small as 1 micron from the air you breathe. It features a 3.9 amp, 300-watt motor. The included electrostatic prefilter cleans dust, bacteria, fungi, and pollen from the air. This model comes with a two-speed on/off pull chain and a variable-speed control knob to dial in the desired airflow from a whisper-quiet 200 cfm to an ultraperformance 750 cfm, cleaning the air in a 30-by-30-foot shop 10 times an hour. The air cleaner measures 12 by 24 by 34 inches (height by width by length). The cabinet is constructed of 20-gauge prepainted steel. The air cleaner comes fully assembled and ready to use with all filters included; just hang it up and plug it in. No outside venting is required and existing room temperature is not affected. This JDS filtration system will operate most efficiently suspended from the ceiling as close to the source of pollution as possible.