Thanks. Would it be best to get One 400S or two 300Ss for our first-floor that has an open floor plan? I don't see us ever using either at full speed. The side-by-side demonstrates the size difference perfectly. The 300S size looks to be less obtrusive and is it more of an off white? We do like the lighter top of the 300S over the 400S.
Please tell me on "sleep mode" is there a big difference between 300s and 400s? I would buy the quietest one. Also, tell me what the filter change interval is for the 300s and 400s. My room is 25 square meters. Thank you.
