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Makes no sense to me either but until laws are put in place(some localities already enforce this) all over North America they'll keep getting away with mid-efficiency setups.

Ryan, our home in Edmonton, AB Canada was built in 2003/2004 and has a near identical setup to yours - two 6" fresh air intakes, one to the cold air return portion and another to a combustion pot that runs to the floor and simply dumps fresh air into the basement. We also have a mid-efficiency...