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So I have a 2 family home with 2 gas boilers (one steam one forced hotwater) and 2 Gas hotwater heaters. This is very common in my area. The basements are around 35x30x7. I have been in so many of these houses yet none have any extra source of air like "fan in a Can". Was it not so common 20 years ago? Also do fan in a cans ever drop the basement temperature you can freeze the water pipes?