Airfoil’s Swirl Cushion box is manufactured to suit our range of Swirl Diffusers. It can be produced in steel or our fire-rated pre-insulated poly panel board. The box is manufactured with an internal “T” brace and comes complete with the root nut to match the centre swirl screw for easy installation. The fitting can be manufactured to any desired specification allowing for special height requirements and difficult spigot placements. Airfoil’s range of fire-rated pre-insulated poly panel board cushion boxes are a lightweight alternative to our metal versions.