Your wood burning stove is dependent upon a properly functioning chimney for optimum performance. It is a high efficiency appliance that loses much less heat up the chimney than older appliances and fireplaces. For this reason it is important to match the stove to the chimney. The chimney has two functions:
1. It draws combustion air into the wood burning stove (without air, no fuel will burn) and
2. It exhausts combustion by-products.
The wood burning stove depends solely on the natural draft of the chimney system to draw combustion air into the unit. Draft is the force that moves air from the wood burning stove up into the chimney. The amount of draft in your chimney depends on the length of the chimney, local geography, nearby obstructions and other factors. Too much draft may cause excessive temperatures in the appliance (overfiring). Slow or inadequate draft equals poor combustion and possible smoking problems. The following are some conditions that may contribute to poor chimney draft:
1. A chimney too large for your wood burning stove.
2. A chimney with not enough height to produce adequate draft.
3. A chimney with excessive height (this may allow exhaust to cool too
much before exiting, which will stall the rate the exhaust exits).
4. Offsets in the venting system are too restrictive (see Chimney Guidelines).
Inadequate draft will cause the appliance to leak smoke into the room through the stove and the chimney connector joints. Excessive draft may cause an uncontrollable burn or a glowing red stove or chimney part.