easy flex

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  1. J

    Advice 6" easy flex in an 8" prefab flue

    So I need a bit of advice. I have a 1989 Majestic MBUC36 prefab with an 8" flue and I am looking at getting a Hearthstone II with 6" outlet. Spoke to the local Heating and Air folks and they said I would need to add a 6" liner and fill the gap with some concrete/vermiculite like substance...