Nailor 4310, 4320, 4330, 4340, and 4350 Series Perforated Diffusers feature a perforated face available in both corrosion-resistant steel and aluminum, with 3/16" (5) diameter holes on 1/4" (6) sta
ggered centers, providing 51% free area. As standard, backpans are available in corrosion-resistant steel with an option of aluminum, and some premium models are available with extruded aluminum frames. The diffusers can be selected to suit most common ceiling types, and are available with both flush and drop face styles. A variety of pattern controllers and deflector core styles are offered, allowing for a selection to be made based upon style, performance, and budgetary considerations.