1 HOUR OF FILTER MAINTENANCE PER YEAR PER UNIT......THAT'S IT!! Up to 30,000 CFM Whole Shop Filtration. We can filter millions of square feet or just one room or area. Our sales staff will work with your Safety or plant manager to get you into OSHA compliance and improve your overall air quality. We are the experts whether you need oil mist collection or another type of air filter device.