Inquiry (采购产品): Floor Hatch What is the assist mechanism on your 60"x60" hatch openings? How is the unit safely opened to prevent strain injuries while lifting the door? What secures the door in the open position? What is an estimated cost for a door of this size? Thank you Dan Mazzeo Facilities Engineering Manager Raytheon Polar Services Co. **** Hidden Message ***** Daniel Mazzeo 7400 So Tucson Way Centennial, CO 80112-3938 USA Company: Raytheon Polar Services Co Title: Facilities Engineering Manager Phone: 720 568-2063 E-mail: daniel.mazzeo@usap.gov **** Hidden Message ***** daniel.mazzeo@usap.gov