The Ghost is a whole house fan that mounts easily on top of the rafters in the attic and effectively draws 2800 cubic feet of air per minute through the house.   The Ghost's unique design includes a small lower housing that fits between 16" or 24" on center rafters.  Internal motorized and insulated doors open into the fan chamber when the unit is turned on, then the 20" diameter fan blade begins drawing the air out of the living space and into your attic.