Job site air filter, 550cfm. Help keep your next cleaning or remodeling job from being a messy nightmare. Two units available, includes clean prefilter, HEPA and carbon filters will pass systems test. The pre-filter (Merv-10) protects the prime HEPA filter acting as a large particle cleaner allowing the HEPA filter to do the finer work. Ideal for home repair and construction sites, sewage remediation, water and fire damage restoration Active Carbon Filter: The carbon filter eliminates odors from paint, smoke, cleaning products, cooking, etc. HEPA filters are standardized to remove 99. 97% of particles that have a size greater than or equal to 0. 3 micrometers. Using on dusty construction sites, mainly interior renovation and demolition