Take note that attenuation could be decreased by normal troffer and will lights, hearth sprinklers, and various by-ceiling penetrations. Missing performance could be prevented by using Ceilume's drop-out and Transluminous® (light-transmitting) panels that allow light-weight fixtures and sprinklers to be put in higher than ceilings without having penetrating the ceiling https://thermal-performance05890.blogscribble.com/32534420/top-guidelines-of-double-glazing