Q&A Chimney Type

QandA Posted By QandA, Oct 5, 2001 at 2:20 PM

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  1. QandA

    QandA
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    Nov 27, 2012
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    Question:

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



    Answer:

    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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