Chimney Flue Length

The venting capacity of a rectangular or square masonry flue if translated directly into actual or measured square inches of cross section is less than a round chimney flue of the same square inches of venting capacity. Chimney height also plays a role and taller chimneys generally draft better than shorter ones. With that in mind the height of the chimney should be at least 15 feet from the floor of the fireplace to the top of the flue.

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Flue Sizing

Determining Fireplace Liner Sizing

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Chimney flue length.

Chimney liner and flue pipe length calculator select pipe or liner type. Quality chimney liner material that meets astm and excels in freeze thaw environments. Typical standards require a cross section area of the fireplace flue or chimney vent to be equal to 1 10 of the area of the fireplace opening itself for a conventional wood burning installation and without considering the effects of a glass fire door. Figuring out the proper size for your chimney flue can seem like a challenge.

For example an 8 x 8 square nominal clay chimney flue tile liner has inside dimensions of 6 3 4 x 6 3 4. Solving your chimney s math. Rigid 304l chimney liner rigid 316l chimney liner single wall black stove pipe double wall black stove pipe metalbestos class a chimney pipe rock vent class a chimney pipe 316l inner 430 outer rock vent class a chimney pipe 304l inner galvalume outer rock vent class a. Dimensions for square rectangular and round clay flue liner.