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Q&A Chimney Type

Post in 'Questions and Answers' started by QandA, Oct 5, 2001.

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  1. QandA

    QandA New Member Staff Member

    Nov 27, 2012

    What is the difference between a Class A and a Class M chimney and how could one tell them apart?


    Class A is an all-fuel chimney, which is good for wood, coal, gas or oil. I have never heard of a "Class M" and though it may exist, it is not commonly used or labeled.

    Class B is for gas only. Class L is for Pellet and Oil.

    Perhaps "M" is the new direct vent gas pipe.

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