BPF660 Our new improved mounting system makes this the most flexible 6" ceiling speaker DNH A/S has made. The hooks are changeable to set upside down, allowing up to 55 mm on the ceiling thickness. The easy mounted dust box has a M20 gland and a M20 blanking plug on the side as standard. The PA ABS material is of course V0 and halogen free. IP 54. 6" plastic grille ceiling loudspeaker 6 Watt, 8 or 20 ohm.