Access panel: 1) specification: 20x20,30x30,40x40,60x60,60x120 2) function:convenient to check the air conditioner and pipe. Access panel:1) specification: 20x20,30x30,40x40,60x60,60x1202) function:convenient to check the air conditioner and pipe.3) Material: water-proof gypsum board and aluminum alloy.