13200 BTU 12 VDC CAB HEATER W/ 2 SPEED FAN Brand new, MARADYNE model H-400012 cab heater. Heater uses engine coolant to heat your cab. Mounts easily to floor of cab. 2 speed fan with speed control switch built into the housing. Four, rotatable, adjustable opening louvers. Glass-filled nylon housing, aluminum tube and fin heating core.