I am installing a Carrier 58MEC060, gas fired furnace.
I want to vent THROUGH ROOF (11/2" x 12' schedule 40 pipe + 2 elbows) AND use combustion air ( 11/2" X 8' Schedule 40 pipe + 2 elbows THROUGH WALL. All installation instructions only show both pipes through roof or both through wall. Is it acceptable to vent through roof and pull combustion/makeup air through wall?
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