A home inspector notices the flue pipe from a gas furnace is sloping downward toward the furnace. What is the correct slope requirement for a Category I furnace flue?
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A
Level is acceptable for horizontal runs
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B
Minimum 1/4 inch rise per foot toward the chimney
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C
Minimum 1/2 inch rise per foot toward the chimney
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D
Any upward slope is acceptable regardless of angle