Patent ID: 8755678

Claim:
An electric forced air heater particularly adapted to heat air in a hazardous area, comprising: a rectangular sheet metal cabinet having at least one intake opening through which air may be drawn and at least one exhaust opening through which heated air may be discharged; at least one explosion proof electric motor driven axial air mover for drawing air axially through at least one intake opening and discharging heated air axially through said at least one exhaust opening; at least one heat exchanger vertically mounted within said sheet metal cabinet to heat air drawn through said at least one intake opening, each of said at least one heat exchanger being formed of heat conducting metal tubes and fins having electric heating elements, an operating temperature monitoring device, and a predetermined hi limit temperature monitoring device inserted therein; said heat exchanger having electrical wires passing through a metal formed explosion proof expansion conduit union “C”, entering a metal formed explosion proof enclosure box, said metal formed explosion proof enclosure box housing potential explosion causing devices; said at least one explosion proof electric motor having said electrical wires passing through a metal formed explosion proof expansion conduit union “A”, passing through a metal formed explosion proof junction box and passing through a metal formed explosion proof expansion conduit union “B”, entering said metal formed explosion proof enclosure box; a multitude of louvers mounted to said sheet metal cabinet and positioned horizontally across said exhaust opening to direct discharged air.