Originally Posted by yuri
I wonder who supersedes who in the Great White North. Local building codes or gas code? I don't get involved in new home construction but know that in Calgary the furnace has to be interlocked by building code to run the fan with a fresh air intake if the kitchen exhuast fan is over 100 cfm or some such size. That may not be in the gas code?
Building codes as well as provincial acts and regulations supersede code, but not if the requirements aren't up to the standards of the gas code. Basically whomever has the tougher requirement (eg. code says that combustion air vents must be 12 inches from finished grade, but the BC and Alberta acts and regulations require 24 inches). In BC we've gotten rid of requiring a fresh air intake into the return, but some inspectors still ask for it, or just that the furnace fan runs on low 24/7, or is timed to run 8 hrs of everyday. Again, this all depends on what city it's in.