In this review, I will first summarize the major points and focus the details afterward. This way you can stop reading when you get the level of details you need. The definitions of "HEPA" and "CADR" are placed at the end of this review. Please vote for this review if you like it :) I appreciate it.**Kimmer (another reviewer) has kindly uploaded a wonderful youtube video to demonstrate the noise level, title: "Honeywell Enviracare 50250..