The 1 Slot Square Diffuser from InviAir offers frameless, flush mount installation with the ceiling for a minimal, modern, and clean look. The design is made from a proprietary composite material that reduces diffuser condensation for optimal performance and durability without the risk of mold. Used for both the supply and return, it suits gypsum, acoustical, tile, or custom system ceilings. The diffuser has unlimited customization, ASTM E 84 Class A rated, and CARB Phase II compliant.