cover 1 or more flues with a top-mount multi-flue chimney cap, we offer over4,845 in-stock sizes and styles of chimney caps and chimney pots at discount prices, the web's largest selection of chimney caps
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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
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.
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.
A chimney cap any size between the red and black dotted lines will work.
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.)
Small 'California' 5/8" Mesh
California Code requires spark arrestor chimney caps to have mesh screens with openings no
larger than 5/8 of an inch instead of the standard 3/4 inch mesh used elsewhere. The intention of the Code is to keep glowing coals from leaving the chimney and starting
wildfires. A few other communities in the southwest have similar codes. If you live in any wildfire prone area, selecting a 5/8" mesh spark arrestor chimney cap is a good idea. It's available on nearly all of our multi-flue chimney caps.