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venting

Found an Endurance today with single and double wall "b" venting tru a wall to the roof. Round to oval. Rusted. Duh.

No way to get tru to roof with new venting and side venting is 31ft. Manual allows 15ft. plus 3 elbows, doesn't give elbow eqiv.ft.

Will the blower handle this length?

Thanks for any input!
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