I recently installed an Aprilaire 5000 EAC and want to know if I can add return ducts to each upstairs bedroom for better air cleaning. I have a 3 level home (basement, 1st and 2nd levels) that was built in 1997 (3400 Sq ft). The unit is a Carrier 2-1/2 ton heating and cooling system (don’t have model # on me). Currently the return duct goes from the basement straight to the upstairs area with 2 large return grills; one in the kitchen area and one in the upstairs foyer. The return duct is about 16x8 or 16x10. I want to branch off the top of the return and install one in each bedroom on the 2nd floor level, so that I am pulling more indoor air to the EAC and possibly get better air circulation. I have access to the top of the return duct in the attic space, so installation should be no problem.
Can this be done without any adverse effects?
Are there any limitations to the number of return ducts?
What’s the best method to do this work?