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I recently had my crawl space encapsulated, which entailed sealing it entirely (including vents) and installing a large dehumidifier. Due to the fact that our furnace is located down there, the installed also put a flexible duct running from one open vent, terminating right next to the furnace to allow for fresh air intake. I was wondering if this is acceptable and enough fresh air for furnace function? I have a carbon monoxide detector in the house, but just want to make sure this is suitable before any issues arise.