In order to put this component to work in your home, all you have to do is to allow an additional 1/2 inch greater masonry hole size than the masonry thimble sleeve diameter to accommodate the thimble. After installation, seal the space between the Masonry Thimble Sleeve and masonry with a high-temperature sealant. It's that simple, and it's that effective, which is why the DuraVent DuraLiner Masonry Thimble is such a popular item.
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