OUR filters and filter media pads are NOT only used for general HVAC usage but YOU will find them used everywhere. Some of OUR customers: animal hospitals. Medical centers. Newspaper facilities. Dentist offices. Bakeries. Restaurants. Jewelers. Condos. ART galleries. Marine AIR. Clean rooms for electronics and equipment repairs. Churches. Temples. Coastguard. Seafood houses. Cabinet shops. Spray booths. Aquariums. Wine cellars. Yachts. Some other uses OUR customers have HAD for OUR media pads and filters: CAR filters. Traffic signal cabinets. Radio stations transmitter cabinets. Aquarium filtration. Duct work for wine coolers. Electric motor casings. Computer TOWERS/RACKS/ENCLOSURES just to name a FEW.