What's the difference between a lay-in diffuser and a surface-mount grille?
2nd YearFlex Duct & GrillesYELLOW · Check First
Lay-In Diffuser (T-Bar): Designed specifically to sit loosely inside the horizontal tracks of a standard 2\text{ ft} \times 2\text{ ft} or 2\text{ ft} \times 4\text{ ft} acoustic drop-ceiling grid framework. It requires no screws to mount. * Surface-Mount Grille: Features a perimeter metal border with pre-punched screw holes. It is designed to be screwed directly into a finished drywall ("hard-lid") surface, wall, or structured bulk-head framing.