Factory Built Fireplaces and Chimneys

Factory-Built Fireplace and Chimney Discussion                                                                                                                                                                                                                                     Factory-built fireplaces and chimneys include components tested, listed, and labeled to be installed together as a system. Such fireplaces are usually designed to burn solid fuels, such as wood, although they may be converted to use gas logs if approved by the fireplace manufacturer. Do not mix components from different manufacturers unless approved by the fireplace manufacturer. Fireplaces designed to burn only gas are not really fireplaces. They are decorative gas appliances. Vented decorative gas appliances are more like a water heater than like a fireplace. Unvented decorative gas appliances are more like a gas range than like a fireplace. Install and use decorative gas appliances according to manufacturer’s instructions and IRC Chapter 24. Note that some jurisdictions do not allow unvented decorative gas appliances. Also note that manufacturers of unvented decorative gas appliances recommend opening a window during use and recommend limits on the duration of use. Read the full Topic

Fireplace Combustion Air

Combustion Air Required

1. Provide combustion air from outside the building for masonry and factory-built fireplaces.

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Masonry Chimneys

Chimney Termination Height                                                                                                                                                                                                                                                                                       

1. Terminate a masonry chimney at least (≥) 3 feet above the roof and at least (≥) 2 feet above any part of the building within 10 feet of the chimney. Measure termination height above the roof from the highest point where the chimney penetrates the roof to where the flue exits the chimney. This provision also applies to many factory-built chimneys. Confirm factory-built chimney termination height using the manufacturer’s installation instructions.

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Masonry Fireplaces

Components Governed by this Chapter                                                                                                                                                                                                                                                            

The material in this chapter applies to masonry chimneys and fireplaces unless otherwise indicated. For rules governing factory-built fireplaces and chimneys, refer to sections of this chapter that specifically address factory-built chimneys and fireplaces and to the manufacturer’s instructions for those components. If there is a diff erence between manufacturer’s instructions and code provisions, use the manufacturer’s instructions unless the IRC specifically states that you should use code provisions.

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