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On a furnace and water heater exhaust venting, what is a negative grade?

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On a furnace and water heater exhaust venting, what is a negative grade?
asked in House Chimney by valletta22 (120 points)
edited by darekrudy
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1 Answer

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Hi,

Could you be more specific? How was “negative grade” used in a sentence along the furnace and water heater venting? It might be referring to the horizontal vent connector pitch which must be always positive / at least ¼” per foot raising towards the vertical section / chimney.
answered by darekrudy (21,730 points)
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