Right? I can't figure this out myself. Every intake I have seen is drawing from the exterior of the home. Both my sons, my own plus the rental. My house is 32 years old and we had it installed 12 years ago when energy efficiency rebate program was going on.
Mind you, won't have problems like...
Why is your fresh air inlet sucking in from the basement on that 90? Mine is sucking in from the out side of the house. Everyone one I have seen ***** from the outside. I wouldn't be happy with that install with the holes and such in the ducting either.