Made of 18 oz vinyl, Drawtite II employs tensioning system that enables 10 x 12 ft door to maintain seal under gusts up to 70 mph and prevents door from blowing out of guides. One-half hp external motor enables door speeds up to 36 ips. Active edge senses objects in path and causes door to reverse direction upon contact. Door mechanics resist contamination, ice buildup, and harsh environmental factors. Sizes range from 8 x 8 to 14 x 14 ft,