Abstract: A roof fixture for ventilating and illuminating the interior space of the vehicle or boat. The fixture includes a blower mounted over a ventilating opening in the roof. An outer cover is mounted to the exterior of the roof over the blower, thereby protecting the fixture and the interior of the vehicle from the elements. A mounting plate is attached to the interior of the roof over the ventilating opening. The central portion of the plate includes a plurality of exhaust openings and a recessed area which receives a lamp for illuminating the interior space. A plurality of damper flaps are attached to the exterior side of the plate, each flap overlying an exhaust opening. When the blower is on, the flaps lift upwardly to permit air flow from the interior space of the vehicle, through the exhaust openings, and out a vented portion of the cover.

Abstract: A roof cavity venting system which draws in outside air, mixes it with inside air in the roof cavity to heat the cold outside air and dehumidify the inside air, and expels the mixture into the home living quarters. The system includes exterior and interior ventilation units, a power-driven fan unit mounted in the ceiling between the living quarters and the roof cavity, and a heating element for heating the air which is drawn through the fan unit.