Genuine Daikin DECK180 Indoor Fan Deck is the fan deck that houses and mounts the indoor unit's twin blower fans and their motor, holding them in correct alignment within the unit. When it is damaged or distorted, the fans can sit out of alignment and the unit can run noisy, vibrate, or lose airflow. A genuine fan deck locates the fans the way your Daikin expects — where a non-genuine part can fit poorly and let them move.