Does It Matter If It's True?How Can A HEPA Air Purifier Assist Me?- It has a white noise which is basically noticeable during the first few hours when it was turned on. It is just like the sound of a mild air conditioner. I ultimately forgot about it this noise a couple of days later though. hepa air purifierOn this case we'd like a device or product able to filtering harmful particles airborne. This is what air filters are designed for such…See More