I am going to have an Aprilaire 5000 installed under my blower (upflow configuration).
1. Do I still need filters for my returns? I have two filter locations...underneath the blower unit and 1st floor ceiling (flex duct).
2. I am designing my dream home and I also have the same question....filters needed in return when you have a whole house Aprilaire 5000 in the return duct?
I will have 7+ returns in my dream home - every bedroom etc. (sheet metal duct insulated on outside).