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Discussion Starter · #1 ·
Hi everyone,

I recently installed a new water heater, but in order to complete the installation, I have to run a new flue. How much vertical rise off the draft hood do I need before I transition it into a 45 deg. elbow? I can't use a wye to just tie it into the furnace flue because there's an 18" return duct in the way.
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