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Product Details. The combination of fan-forced efficiency, counterflow heat delivery and sealed combustion makes Cozy Direct-Vent Counterflow Wall Furnaces the perfect heater for multi-story units, room additions, garage apartments, vacation homes, and more. Cozy Top-Vent Counterflow Wall Furnaces can be mounted on any inside or outside wall.. This direct-vent wall furnace by Williams Furnace Company is a highly efficient indoor heating unit that, operating at 30,000 BTUs, works to safely distribute heat throughout any indoor space at minimal cost. Ideal for use in garages, workshops, and living spaces, this Williams direct vent heater is conveniently compact - just 10 1/4 inches.