16" Wide Cress Furnaces

HLC: High Limit Controller.  Protects Processes and Equipment From Excessive Temperatures due to relay and controller failure.
Exhaust Blower: A venturi type exhaust system.  The blower mounts to the back of the furnace and draws through three holes in the rear wall.  Exhaust volume can be adjusted by opening and closing the swing gates over the air inlet holes in the door.