I was driving past a house under construction and saw this device in its driveway. It was operating, making a continual noise. Does anyone know what this machine is and what it does?

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It looks like a fan-forced portable furnace, to blow warmed air into the cold building that is being built.

  • Would this be called a mobile indirect fired air heater? The purpose is to have all combustion gasses exhausted out side while a heat exchanger warms the air delivered to the inside through the flex duct. I would never have known they existed with out your answer. – Kris Nov 14 '19 at 13:34
  • 3
    I'm up in Canada, eh? – John Canon Nov 14 '19 at 16:46
  • @Kris It's definitely a mobile air heater, can't say about the rest of your description. – Mast Nov 14 '19 at 17:44

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