Our new improved mounting system makes this the most flexible 5″ 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. A high quality 5″ ceiling-speaker with dust box and spring clamps for mounting. Specially fitted for clean room environments. The ceiling speaker is versatile, can be used in most installations, but especially in environments such as production facilities for micro-electronics, pharmaceutical industry, photo industry and laboratories.