Understanding Draft | Beckett Corp.
If the combustion chamber draft drops to .01 inches of water, the total pressure becomes .40 +.01, or .41 inches of water. This is a reduction in draft of about 18% which will cause a reduction in the amount of air flowing into the combustion chamber. You know what happens when the excess air is not properly adjusted. The burner may very likely smoke as a result of this change. That is why proper draft must …Get Price