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#11
03-31-2021, 06:24 PM
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If its a natural draft heater the horizontal run shouldn't exceed 70% of the rise. Example, 10' of vertical means no more than 7' of horizontal. If its a fan assist some of those run the vent slightly downhill and have a cap directly outside. The downward slope to outside allows condensation to run away from the heater. Manufactures specs overrule these. B vent does several things, along with providing closer clearances to combustibles it also helps the flue gasses retain heat which helps with the exhaust process. Single wall vent exposed to unconditioned air will also rust out much faster.
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