asked in category: General Last Updated: 13th April, 2020

# How do you measure chimney pipe diameter?

How to Measure a Stove Pipe
1. Measure the inside diameter of the flange on your wood stove.
2. Determine the distance from the wood stove to the chimney.
3. Add 18 inches to the measurement.
4. Attach the stovepipe to the flange on the wood stove using 1/4-20-1/2-inch metal or machine screws to secure the stovepipe in place.

Consequently, how do you measure a chimney?

1 – Measure Your Chimney Flue

1. Measure inside the chimney SIDE TO SIDE & FRONT TO BACK at the narrowest part of the flue (usually about 600mm above the opening).
2. FINALLY measure to the narrowest part of the flue from the top of the fireplace opening.

Likewise, how do you measure flue size? Step 1: Find the cross-sectional area of the fireplace opening. Multiply the W=36" X H=30" and that equals 1080 square inches of fireplace opening. Step 2: If you are using a round liner and the chimney height is more than 8' above the fireplace opening you can divide the 1080 by 12.

Likewise, what is the standard size of a chimney?

Prefab or Metal Chimneys

Chimney Size Common Venting Uses
Inside diameter (inches) Inside Area (square inches)
8 50.3 Stoves, Small Fireplaces, Central Heaters
10 78.6 Stoves, Fireplaces, Central Heaters
12 113 Fireplaces, Central Heaters

How big should my flue be?

As a general rule, the diameter of the chimney should match the flue collar on your wood stove. A 6-inch stove requires a 6-inch flue. In most cases, a step up is also fine. For example, you could vent a 6-inch stove into an insulated chimney that is 8 inches in diameter.

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