Drolet Heat Commander Installation And Operating Instructions Manual page 66

4. Dirt in the lateral exchangers (1 and 3) fall into the combustion chamber at the rear.
5. Dirt in the central exchanger (2) will be removed from the front or the rear of the furnace.
If you remove dirt from the central exchange to the back of the furnace, remove the black
pipe connector to dispose of the deposit.
6. Then, check that the baffle is clear of ash and reposition it in its original position towards
the back of the combustion chamber. Important to note that the furnace will not burn
correctly if the baffle is out of place during use.