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Vent length


kurt
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Be advised I'm only replying because no one else has. I'm the least qualified to comment since a majority of the buildings I'm in have oil fired boilers.

I'll assume that "flue" length is referring to what we call vent connectors. I believe cat. I connector length can be 75% of the height of the chimney. If said connector is "B" vent, it can be 100% of the chimney height.

Cat. II, III & IV vent connector length should be specified by the manufacturer of the furnace. Could your lost chart be from a manufacturer?

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