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I have 2 separate furnaces, one for basement suite and another one for upstairs. The tenant in basement suite smokes and I smell the cigarette smoke upstairs through the vents... how is that possible if we are supposed to have to different air systems? I asked the technician, he said we are sharing the return air vent, what the heck!! My question: is it possible to have 2 different air return vents? how the tenant in the basement suite can have his/her own air system without sharing?

Thank you.

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  • Hello, and welcome to Stack Exchange. Where are the furnaces located? Dec 29, 2016 at 20:50
  • Does the inter-unit separation have any ratings, or is it an unrated interior assembly? Dec 30, 2016 at 21:56

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Yes. Both either should not be from the same room and/or the room should be very large and can pull make-up air from elsewhere.

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