I bought two of these bathroom fans from Rona. They were on clearance. I wonder(ed) why. As it turns out, most bathroom fans have 4-inch ducts. This one has 3″. Why on earth would one need to move that much air out of the bathroom? Anyway, I’ll get some 3″ flexible ducting for this next time I’m out shopping.
So why two? I thought I’d replace the one at home eventually. It never occurred to me to check the duct size. I’ll do that … someday.