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Thanks GBR. That article is very typical of what I keep running into - written assuming a full attic; though the thought that air is leaking through the fan housing is something I have thought of but haven't come up with a solution that satisfy's my desire to not add a bulkhead or drop an...

My wife and I purchaced a house built in 1970 a couple years ago. It has a low slope roof (2 in 12) with no traditional attic, but instead the Ontario Building Code Minimum of 50mm inside of an 8" joist. Insulation is limited to R20. The original exhaust fan didn't move much, if any, air from...

Hmm. Outside air is required to feed the furnace. I understand that. However, does the requirement for ducting outside air into the space around the furnace change when there is also a heat recovery ventilator (HRV) in the house? The HRV brings the fresh air into the house from outdoors, but...