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Page 12
Part 7 Proper Draft
Draft is created in a chimney by warm air exiting the stove and rising in
the cooler air of the chimney. (Suction up the chimney)
Maintain adequate draft of warm air exiting the stove at all times.
Chimney draft will increase or decrease depending upon wind speed and air
temperatures along with other factors such as:
1. Air leak in stove or chimney. (Cleanout doors commonly used at the
bottom of chimneys must not leak.)
2. Stove door gaskets are faulty or doors are not closed tightly.
3. Stovepipe, stovepipe outlet, or chimney partially or fully blocked.
4. Chimney temperature is not hot enough.
5. Chimney is not high enough.
6. Trees, buildings, or other obstructions too close to the top of the chimney.
7. Chimney flue is too large.
8. Vented exhaust fans as found in kitchens, bathrooms, and cloths dryers
when running in a tight building can cause low draft and in some severe
cases downdraft. This will cause air to pull down the chimney instead of
allowing it to go up.
Max BTU Output:
Model 627/629: 22,000 BTU/HR
Model 657/659: 27,000 BTU/HR
Model 677/679: 50,000 BTU/HR
Model 667/669: 40,000 BTU/HR
CAUTION: Some of the above conditions can also cause downdrafts.
An indication that a downdraft is occurring will be the smell of sulfur
(rotten eggs). This may also cause the grate unit to melt.
If any one of these conditions occurs, DO NOT OPERATE THE STOVE
until the problem has been corrected.
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