2-Story New England Home 2 Systems - 2 ton and 4 ton Air Condtioners All Slotted Diffusers installed on lower level. Ceiling Outlets installed on upper level.   Telluride Star House "Here is your equipment working splendid with a Broan ERV Unit. This was the first time using your product and I could not be any happier." -- Greg Simpson Nice Oak outlets with this 4 ton system.