Access Control Panel, Access Panel 1.Material:zinc plate 2.Mode:250*150,380*250,510*380,660*510mm Access door for rectangular ducts 1.Material:zinc plate2.Mode:250*150,380*250,510*380,660*510mmSpecifications: Size50 x 230mm/155x 245mm/200x290mmApplication4-3/4" x 4-3/4" Wall OpeningNumber of Latches2.0Doorgauge galvanized steel,Double panelFramegauge galvanized steel w/ 5/8" notched knock over ...