This temporary indirect-fired heater is an ideal unit for a construction or manufacturing plant when heating is needed but moisture is to be avoided. At 500,000 BTU, this unit can help maintain temperature in many sizable spaces. Operating on LP or NG, the heater can easily be fixed to a fuel source and the heat can be ducted to any area of the job site or facility to provide clean, dry, warm air.  Two 12″ duct attachments can run heat to two different areas in your building.  Zero moisture and carbon monoxide will contaminate your heated space.  Can be placed indoors but requires a venting setup but can also side outside a building with ductwork attached, directing the warm, dry air where needed most.