I was about to install a Wait6000 whole home humidifier when I hit this snag in the plan.
On page 3 of their manual (PDF), it says the cold air return duct must be at least 10" wide. The diagram show the humidifier install on that skinny side of the duct. My duct is only 8" wide. I was planning to install it along the other side where it is plenty wide enough.
My question is, does it matter if I install it on the length of the duct? It would meet all other criteria.