Assertion: exhaust flue | /r/HasProperty | pvc
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Source sentences:
text: Second possible case - if this pipe comes off the exhaust flue - usually PVC but sometimes stainless pipe or duct, usually 2-3 inch on normal residential sized units, coming off the top (centered except if you have a heat pump on top) of the water heater and leading outside, meaning you have a high efficiency "direct vent" rather than "gravity vent" heater, then this is condensation from the flue gases.