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Does my exhaust fan always need to be installed in the ceiling?
NO. Several exhaust fans can be installed in a wall. The limiting factor will be the thickness of the wall cavity. Typical construction uses 2" x 4" studs which will limit the number of fans that will fit within this space. Always mount the exhaust fan as high up on the wall as possible. Exhaust fans with lights and units with heating functions should not be mounted within a wall.