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.

Chimney flues size.

A q v 3 where. Dimensions for square rectangular and round clay flue liner. As i said standard flues were designed to fit with standard brick. In the end you just want a chimney that drafts properly and allows you to enjoy your fireplace.

Square flue liners are nominally sized using outside dimensions. Quality chimney liner material that meets astm and excels in freeze thaw environments. A cross sectional area of chimney m 2 q volume of flue gases at chimney temperature m 3 s v velocity m s. Solving your chimney s math figuring out the proper size for your chimney flue can seem like a challenge.

The velocity of air and flue gas in a smaller furnace should not exceed 2 m s. In most cases a step up is also fine. As a general rule the diameter of the chimney should match the flue collar on your wood stove. If a chimney s diameter is six inches then the flue should also measure six inches.

A 6 inch stove requires a 6 inch flue. If the flue is circular then it should be at least one tenth the size of the fireplace opening. For example an 8 x 8 square nominal clay chimney flue tile liner has inside dimensions of 6 3 4 x 6 3 4. The ideal flue size is typically determined by the exhaust outlet of the stove or appliance.

Design velocities of larger furnaces should not exceed 10 m s. However generally speaking a rectangular chimney flue size should be at least one eight of the fireplace s opening. Please note that the chimney pot base should not impinge upon the inside surface of the flue liner. Required chimney area can be calculated as.

For example you could vent a 6 inch stove into an insulated chimney that is 8 inches in diameter. 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. Flues should also mirror the size of a chimney. Just muliplying these dimensions together 6 75 x 6 75 45 56 sq 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. A standard 12 x12 flue was what we now call a 13 x13 flue.