Fan-Tastic Vent 801259 Vent Upgrade Kit for 1250 - White UPGRADE KIT - This kit allows you to upgrade your existing Fan-Tastic Vent to a model 4000R. ADDITIONAL FEATURES - Includes new interior assembly, Pop N Lock screen, 3-speed and reverse airflow switches completely pre-wired. AUTOMATIC LIFT - Automatic lift system with up/down switch. RAIN SENSOR - Automatic dome closing rain sensor.