Serves as a silencer and reduces noise emissions. ER-SE UP: for retrofitting all ER devices. ER-SE AP: for retrofitting all ER-AP and ER-APB devices. Easy to install. Building material class B1.Article: ER-SE AP, Installation location: Housing, Installation type: Surface-mounted, Material: Melamine resin foam, Color: gray, Weight: 0.01 kg, Weight with packaging: 0.18 kg, Width: 220 mm, Height: 220 mm, Depth: 40 mm, Width with packaging: 260 mm, Height with packaging: 260 mm, Depth with packaging: 90 mm, Total insertion loss: 1.5 dB, Insertion loss note: max. 3.5 dB