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How to Measure for and Select a Multi-Flue
or Top Mounted Chimney Cap

You need to take three measurements in order to choose the correct top mount chimney cap. First, measure the length and width of your entire chimney, as shown by the red dotted line in the diagram to the right. Next, measure the length and width of a rectangle just big enough to include all the flues on your chimney, as shown by the black dotted line . This is the minimum screen size. Last, measure the height of the tallest flue above the top of the chimney, as shown by the blue dotted line.

Your chimney cap can be any screen size between the dotted red rectangle and the dotted black rectangle. Most chimney caps have mounting flanges that add 1 1/2 inches to each side of the screen. So, for example, a top mounting chimney cap with a screen size of 13 by 17 inches will cover 16 by 20 inches of the top of your chimney. The Assemble-It-Yourself Whitecaps chimney caps can be installed with the mounting flanges inside the screen (facing toward the flues) or outside of it (facing toward the edges of the chimney.)

• If your goal is to protect the top of your chimney from deterioration caused by weather and acid rain, choose the largest screen size that will fit within the red dotted line. 
• If your goal is to be as economical as possible, select a chimney cap the size of the black dotted line.

Some chimney caps are taller than others. The height of the screen part of a chimney cap is the screen height. There must be at least 5 inches of clearance between the top of your tallest flue and the lid (or roof) of the chimney cap. Select a chimney cap with a screen height 5 inches above your tallest flue (at least 5 inches taller than the blue dotted line.)

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