This optional exhaust filter combines two Filtrete filters with a thick layer of Activated Charcoal to provide heavy duty trapping of unpleasant odors. This is recommended of pet owners who desire better odor control. The completely sealed systems in Lindhaus HEPA uprights and canisters, when equipped with this exhaust filter, will provide outstanding filtration plus excellant odor control.   For similar products see our list of Lindhaus Vacuum Supplies. Show Less