Specifications - The Nilfisk CFM 3997    3997 3997W 3997WC Voltage @ 60 Hz. volts 440-480 440-480 440-480 Type of power no. of phases three three three Current draw amps 41 41 41 Power watts 24,600 24,600 24,600 Waterlift, max. inches H20/inches Hg 250/18.4 196/14.4 196/14.4 Airflow, max. cfm 736 1442 1442 Filter area, main sq. ft. 70 70 118 Filter area, HEPA*, downstream sq. ft. 301 301 301 Noise level dB(A) 80 82 82 Protection IP 54 54 54 Insulation class B B B Tank capacity gallons 46 46 46 Machine inlet inches 4 4 4.75 Dimensions inches 75.59 x 35.43 x 85 75.59 x 35.43 x 86.61 75.59 x 35.43 x 86.61 Weight lbs. 1438 1537 1537 Cord length ft. 30 30 30 Filter efficiency, HEPA (DOP-tested) % @ 0.3 microns 99.999 99.999 99.999 Optional Accessories Stainless steel collection container and components Various filter materials are available for special applications Bracket and strap for emptying the container with a forklift << back