20" x 10" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Filter Grille + Product Details Perfect Fit Suitable for all AC 8in diameter 12125SDCLNGBX

+ Product Details Perfect Fit & Easy Sizing - Designed for a 18" x 6" OR 6" X 18" duct opening (measured at the opening)

Versatile Compatibility: Our ceiling grills aren't limited to just T bar drop ceilings

fasten the edges to studs with the provided screws

75"H – fits a 14" X 12" duct opening

20" x 10" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Filter Grille + Product Details Perfect Fit Suitable for all AC 8in diameter 12125SDCLNGBX + Product Details Perfect Fit & Easy Sizing Designed for a 18" x 6" OR 6" X 18" duct opening (measured at the opening) Versatile Compatibility: Our ceiling grills aren't limited to just T bar drop ceilings