Grade 1 closer for store fronts. Conforms to ANSI/BHMA standard A156.4 - 2000 Grade 1. UL listed. Spring power closer size adjusts from 2 through 5. Size 2 is rated for 3 pounds minimum closing force on a 50 pound door. Size 5 is rated for 11 pounds minimum closing force on a 155 pound door. Controls door through entire opening-closing cycles. All season fluid. The minimum closing force is measured 30 in out from the hinges when the door is within 3 in of the closed position in all cases. 180 Lbs. maximum door weight.