What Are the Different Classes of Chimneys?

Class 1

• The Class 1 chimney features construction either from stone or bricks. It is the most versatile of all and is ideal for stoves and gas fires. This class of chimneys is deep, which means that you may pick from a wider range of fireplaces: from the deep, full-depth fireplaces to the more shallow slimline fireplaces. For a chimney to be a Class 1 chimney, it must have a diameter of at least 7 inches and a height of approximately 10 feet..

Pre-fab

• A pre-fabricated chimney is characterized by a diameter of 5 inches and a height of at least roughly 10 feet. This class of chimney is appropriate for many stoves and many fireplaces. Chimneys that are pre-fab are usually found in homes that are newer, and they are usually made out of metal. This class of chimney permits you to pick a fireplace with either a shallow or a full depth, mainly because of its height.

Pre-cast Flue

• A pre-cast flue is a class of chimney found in modern homes. You can identify this chimney by looking for the ridge tile on the roof of a house. A pre-cast flue is built in one of two sizes, based on the date it was made: pre-1986 and post-1986. A pre-cast flue is at least approximately 10 feet in height. This class of chimney allows you to install a big range of slimline fireplaces.

Air-cooled

• An air-cooled chimney is a type of factory-built chimney. The design of an air-cooled chimney is two layers of metal with air between the two layers. The air between these layers of metal absorbs and consequently dissipates any heat from inside the chimney to prevent overheating and damage to the chimney.