Abstract: An exhaust and deodorizing system for an animal housing. The system features an exhaust unit provided with an air inlet operatively-connected to the interior of the animal housing. The exhaust unit further includes a replaceable filter, an air outlet and an electric fan. The fan is capable of moving a current of air from the inlet, through the filter, and then to the ambient area via the outlet. An important feature of the invention is a flexible mat that conforms to, and seals, the top of the animal housing. The mat includes a hole that can be placed in at least partial registration with a ventilation hole in the housing. The exhaust unit's inlet fits in, or on, the hole in the mat. It should be noted that exact registration between the exhaust unit's inlet and the ventilation hole in the housing's roof is not required.

Abstract: An exhaust filter system, in an animal habitation structure, for example, for cats, may be retrofit to a roof with a ventilation hole. The filter system has a housing provided with an inlet and an outlet, an electric fan mounted to move a current of air from the inlet through a filter, received in a slot provided in the housing. The filter is made of any suitable material, but is preferably activated charcoal. An important feature of the invention is the moldable membrane for connecting the inlet to the filter housing to the aperture in the roof, which is a moldable, flexible rubber or other plastic membrane, preferably polyurethane rubber, affixed to the inlet borders of the exhaust system and laid upon the roof, capable of conforming to the surface contour of almost any roof and covering, but not affixed to, the ventilation hole in the roof, to form a substantially air-tight seal with the roof.