How large is too large? Acceptable Flue Size Increases for Roof Exits But as long as the chimney isn't too large, the stove will still draft just fine. A larger chimney does have a negative effect on draft, since it allows the flue gases to slow and cool before they escape the top of the chimney. However, increasingthe flue to a size larger than the stove's collar (or flue flange) is sometimes permitted. Per NFPA-211 (the industry standard for residential style wood stoves):ġ2.4.4 (1) The cross-sectional area of the flue shall not be less than the cross-sectional area of the appliance flue collar, unless specified by the appliance manufacturer. Doing so would restrict the flue system to less than required for proper draft, causing smoke to spill out of the air intakes.
This phenomenon is commonly referred to as "draft," and without it, a wood stove will not function.ĭecreasingthe flue size smaller than the stove's collar (or flue flange) is almost never permitted. The rising column of hot flue gas actively pulls combustion products from the stove, and pulls fresh air in through the intakes. The flue is the "engine" of a natural draft wood stove. The size of a wood stove chimney is critical to its performance.
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