Chimney Flues Size

But chimney experts and draft measurements show that in a rectangular flue not all of the cross sectional area is equally effective in developing draft.

Chimney flues size.

For example a 13 x13 flue can be wrapped with eight standard brick per course to build a chimney that is 21 x21. The velocity of air and flue gas in a smaller furnace should not exceed 2 m s. As a general rule the diameter of the chimney should match the flue collar on your wood stove. In the end you just want a chimney that drafts properly and allows you to enjoy your fireplace.

Quality chimney liner material that meets astm and excels in freeze thaw environments. A modular 12 x12 flue is what we now just call a 12 x12 flue. A standard 12 x12 flue was what we now call a 13 x13 flue. If the flue is circular then it should be at least one tenth the size of the fireplace opening.

A q v 3 where. Square flue liners are nominally sized using outside dimensions. Just muliplying these dimensions together 6 75 x 6 75 45 56 sq in. Required chimney area can be calculated as.

If a chimney s diameter is six inches then the flue should also measure six inches. Dimensions for square rectangular and round clay flue liner. A cross sectional area of chimney m 2 q volume of flue gases at chimney temperature m 3 s v velocity m s. The ideal flue size is typically determined by the exhaust outlet of the stove or appliance.

For example an 8 x 8 square nominal clay chimney flue tile liner has inside dimensions of 6 3 4 x 6 3 4. As i said standard flues were designed to fit with standard brick. One exception to this is that round based pots may impinge at the corners of a square flue but not by more than 3 4 in. 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.

Solving your chimney s math figuring out the proper size for your chimney flue can seem like a challenge. Design velocities of larger furnaces should not exceed 10 m s. Please note that the chimney pot base should not impinge upon the inside surface of the flue liner. For example you could vent a 6 inch stove into an insulated chimney that is 8 inches in diameter.

Flues should also mirror the size of a chimney. A 6 inch stove requires a 6 inch flue.