Modine HDS45AS0111 Natural Gas Hot Dawg Garage Heater 45,000 BTU Separated Combustion Natural Gas 45,000 BTU's 80% Efficient For use where combustible materials are present (ie. Paint or Woodworking Shop) Commonly used in 2 - 2.5 Car Garages Separated Combustion: Fresh air intake and separate exhaust Model: HDS45AS0111