I have the wood burner model 24-fc / 24 ac. there are 2 slide levers. 1 small one under the door. this control looks like it could be a damper control however when you slide it in and out it does not appear to change air to fire box. If you close door on front fire will smother out no matter of adjustment in or out. Lever on side appears should control heat to heat exchanger but does not seem to make any differance in control of ait to fire in box