What Is The Standard Chimney Cap Size?

What Is The Standard Chimney Cap Size? A chimney cap is an important component of any chimney system. It is designed to protect the chimney from water, debris, and animals, while also improving draft and preventing downdrafts. But what is the standard chimney cap size?

What Is The Standard Chimney Cap Size?

The standard chimney cap size will depend on the size of the chimney flue. The most common flue sizes are 8 inches by 8 inches (20 cm by 20 cm) and 13 inches by 13 inches (33 cm by 33 cm). Chimney caps are available in a variety of sizes to fit different flue sizes.

Chimney caps can also come in different shapes, such as square, rectangular, or round. Some chimney caps may have a mesh screen to prevent animals and debris from entering the chimney, while others may have a solid top to improve the draft and prevent downdrafts.

When choosing a chimney cap, it’s important to consider the size and shape of the chimney flue, as well as the type of material used for the cap. Chimney caps can be made from a variety of materials, such as stainless steel, copper, or galvanized steel. Stainless steel and copper are popular choices for their durability and resistance to rust and corrosion.

It’s also important to choose a chimney cap that is easy to install and maintain. Some chimney caps may require professional installation, while others can be easily installed by homeowners. Regular maintenance, such as cleaning and inspection, can help extend the lifespan of the chimney cap and ensure proper function.

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How Do I Know What Size Chimney Cap I Need?

Add five inches to the height of the tallest flue pipe and use the width and length of your chimney crown to find the height and dimensions of a working chimney cap.

How Do You Measure And Replace A Chimney Cap?

You’ll need to take five basic measurements to find the right fit.

  1. First, measure the length and width of all the flues together, from the outermost sides.
  2. Next, measure the width and length of the entire cement crown. 
  3. Finally, measure the height of your tallest flue.

Can A Chimney Cap Be Too Big?

If the chimney cap is too big or too small, the fireplace will not be able to draw in the right amount of air to force smoke and other byproducts of combustion up and out of the chimney. Likewise, improperly installed or fitted chimney caps can cause structural damage to the rest of the chimney structure.

What’s The Difference Between A Chimney Cap And A Flue Cap?

For some reason, when brick chimneys get constructed, a chimney cap is seldom installed with it. Chimney caps for brick chimneys often get called by a few different names such as spark arrestor, chimney rain cap, flue cap, and animal guard. It is crucial for brick chimneys to have a chimney cap.

What Size Is A Standard Chimney Cowl?

The Standard Chimney Rain Cowl fits flues and pot sizes from 125mm (5″) to 250mm (10″) internal diameter with the umbrella lid going to 300mm (12″) external diameter. This Chimney Cowl is Suitable for Multi Fuels. The Standard Chimney Cowl is available in a Terracotta and Buff Stone finish.


In conclusion, the standard chimney cap size will depend on the size of the chimney flue. When choosing a chimney cap, consider the size and shape of the flue, as well as the material and ease of installation and maintenance. A well-designed and properly installed chimney cap can provide years of protection and improved chimney performance.


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