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Main Vent Recommedations

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Mike Johnson
Mike Johnson Member Posts: 5
in THE MAIN WALL
My main is 112 feet long. The first 14 feet is 4 inch pipe followed by 9 feet of 3.5 inch pipe, 8 feet of 3 inch pipe, 16 feet of 2.5 inch pipe, 34 feet of 2 inch pipe, and 31 feet of 1.5 inch pipe. What size main vent would you recommend? Thanks for you help.
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