All About Class A Chimneys

Most new chimneys being built these days are “Class A,” “All-Fuel,” “prefabricated,” or “factory-built” chimneys. This just means that rather than being custom-built by a mason on top of your roof, these chimneys are made in a factory, are round instead of square, and are made of metal instead of brick and mortar. Class A Chimneys are designed to exhaust wood, coal, oil, or gas-fired low heat residential appliances. In other words, a Class A chimney is a good, affordable, and versatile way to vent just about any type of stove or fireplace.

This type of chimney can be used with the following appliances:

  • Wood-burning stoves
  • Gas-burning stoves
  • Wood fireplaces
  • Gas fireplaces
  • Furnaces
  • Boilers
  • Ranges
  • Water heaters
  • Factory-built fireplaces

The type of Class A Chimney you need will depend upon the size of your appliance. An improperly sized chimney results in poor draft and excessive creosote formation, which means you’re putting your home and your loved ones in danger of a chimney fire or of carbon monoxide poisoning. Prefabricated chimney systems are made of stainless steel and come in a kit that includes all components needed to maximize the safety, efficiency, and lifespan of your chimney. These chimney systems are far more affordable than most masonry chimneys to construct and maintain.

Professional Chimney Installation

If you want to try your hand at a do-it-yourself installation, we urge you to consider a project other than chimney installation. Every chimney, whether prefab or masonry, should be installed by a Chimney Safety Institute of America (CSIA)-certified chimney technician who fully understands how a chimney works and why it’s important. Furthermore, in many cases, manufacturers will only recognize their warranties when a chimney has been professionally installed.

A complete Class A chimney system will include some or all of the following components:

  • Rain cap
  • Storm collar
  • Adjustable roof flashing
  • Stainless steel elbow
  • Attic insulation shield
  • Stovepipe adaptor
  • Decorator
  • Ceiling support
  • Stovepipe

An expert will be able to determine the proper chimney width and height for optimum drafting and proper clearance to combustibles. An expert will also be able to determine if your chimney needs a through-the-roof installation or a through-the-wall installation; different types of installation require different components. In addition, all Class A Chimneys should be installed with blanket insulation to protect adjacent walls from heat transfer.

Regardless of whether you live in Lafayette, GA, Chattanooga, TN, or Fort Payne, AL, if you need to have a Class A Chimney installed, call The Fireplace Service Company today at (256) 845-9814.


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There are lots of reasons why you should use us for your chimney, fireplace and dryer vent needs and, when you contact us, you’ve taken the first step toward discovering those reasons for yourself.


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