Air Door Emergency Release Valve release the door after about 5 seconds, then the door can be pushed open. EMERGENCY USE ONLY Krystal Enterprises 12 RETURN TO MENU C E O IS U N W T E R C L O C K N O TVAP ELR :VIO E M UO S TV B E C HE E CO KP EE DR DT AI I LN Y , R T E H IC L A O C A U T I O N ! For Emergency Door Opening, turn red valve counter clockwise, this