The Dometic DFMD 30111 30,000 BTU Medium
Furnace is a compact, lightweight heater boasting a quiet operation
thanks to reduced air turbulence. For easy and flexible installation, it
may be placed vertically or horizontally. With the most duct
configurations on the market, you can distribute heat exactly as you
need it. Access door and thermostat sold separately. Please ensure the
existing cutout will accommodate this model: 7-3/8 in. H x 16-1/2 in. W x
20 in. D.