UFI air duct filter is used for air filtration in round ventilation ducts. The filter consists of a class EU4 filter insert with a grid on both sides made of galvanized steel. The round ventilation duct is used as a housing Galvanized sheet steel with seals. The special design of the UFI filter allows for easy Replacing the filter insert. The UFI air duct filter is for mounting between two round ventilation ducts with standard diameter (100-315mm). You can find accessories items in our shop:.