The ACSI Force Air 2000 EC Negative Pressure Air Scrubber, at 2,000 CFM, is among the most powerful HEPA units available. It can change the air in a typical 12' x 12' room well over 100 times an hour. Designed for high power portability in a rugged no nonsense package while being lightweight, durable, and rust resistant. Features a modular control panel and service.