1. Corrosion-resistant steel diffuser face. One piece molded fiberglass backpan with foil back vapour barrier. 6.0 R-value.2. Diffuser features a smoothly contoured back pan and wrap-around fixed perforated face. Four stamped pattern controllers are mounted on the back of the perforated face, to provide a 4-way discharge pattern, providing excellent performance in VAV systems.3. Perforated face has 3/16" (5) diameter holes on 1/4" (6) staggered centers. 51% free area. Center access hole with plug for screwdriver adjustment of the optional damper.4. Pre-scored plenum for 6", 8", 10", 12", 14" or 15" (152, 203, 254, 305, 356 or 381) spin-in or tab-lock inlet collar (by others).5. Standard finish is AW Appliance White face and black interior.