Fireplaces are increasing in popularity, both in remodeling and in new construction. One industry association estimates that over seventy-five percent (more than 500,000) of all fireplaces installed each year are factory-built. Because these units are now more commonly being installed in non-traditional areas of the house such as kitchens, it is critical that Michigan code officials and building inspectors become familiar with their installation considerations.

Factory-built gas fireplaces are vented in three ways: natural draft (vented through the roof), direct vent and unvented (vent-free or ventless). The majority of gas fireplace sales are direct vent units. Direct vent fireplaces are popular because these sealed systems draw 100% combustion air from outdoors and then exhaust the combustion products outside as well, which protects indoor air quality of the home.

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