The Fan Motor Is completely enclosed for a longer life and to protect Against Current Surges. The Permanently Lubricated Bearings Grant Long Life. Automatic Drainage Of Condensed Water Through The Drain Pump.The Emergency Operational Switch Button On The Indoor Unit Allows You To Operate The AC, Even When The Remotes Is Missing Or Non-Functional The Filter Can Be Removed Easily By Swinging Open The Return Air Grill And Sliding It Out, You Can Conveniently Clean It Whenever You Want.