Modine 53188 - Model HDS 30000 BTU Natural Gas Unit HeaterModel HDS 30000 BTU Natural Gas Unit Heater The Hot Dawg separated combustion garage heater pulls 100% of the combustion air from outside, making this unit ideal for workspaces such as wood shops or a garage where paint or flammable materials are used regularly. The fresh air supply reduces the common concerns about performance and durability that can come when working in a dusty or particulate laden environment. Modines Hot Dawg is available in 6