How to Measure Your Chimney Cap

Fill in the blanks of the diagram below to determine your chimney cap size and provide measurements for ordering. If you have a chimney with a clay flue, the pipe diameter and location measurements are not needed. Please specify clay flue.

Important Things to Note

Be certain your chimney is square! An out of square chimney requires a cap that is the full length and or width of the chimney plus the amount it is out of square. The reason is that an out of square chimney is skewed. Thus, if your chimney is 1/2" out of square and the opposing sides on the out of square dimension are 36", you will need a 36 1/2" chimney cap on that dimension to compensate for the out of square. (See diagram below.)

The size of your spark arrestor. The Classic Bell has a standard 24" inside height for the spark arrestor; the Suburban a 20" height. This is more than sufficient for most chimneys, but be certain: measure your spark arrestor height!

As always, if you need assistance, please feel free to call one of our experts.

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