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  1. #1
    Join Date
    Sep 2013

    Default Do I have to use a wall thimble if I use double wall pipe?

    I have a small 80% gibson furnace I am putting in a basement.

    The installation includes a wall thimble and end cap.

    What is the best source of thimbles, and end-caps, adapters...?
    Last edited by Fred Bob; 09-30-2013 at 05:17 AM.

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