Oversized or Undersized Flue:
The size of the fireplace flue is determined by the size of the fireplace opening. As a general rule, the flue should be at least one-tenth the cross-sectional area of the fireplace opening. For example, if you have a fireplace measuring 40" x 24", you need an 8" x 12" flue. With wood stoves, the flue needs to have the same cross-sectional area as the stove's vent opening.
In either case, a flue that is too small will not be able to accommodate the amount of warm air rising from the fireplace or stove, which means that the smoke backs up into your home. A flue that is too large may not draw fast enough. Common solutions include reducing the size of the fireplace opening or installing a chimney liner to reduce the size of the chimney. If you need a chimney installation or chimney cleaning in York PA, click the link to speak with a professional.
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