28" x 16" Cube Core Eggcrate Return Air Filter Grille for 1" Filter ceiling Installing the plaster frame is

Installing the plaster frame is effortless – secure it into your sheetrock

+ Product Details Size - 18"w X 24"h X 2"d (for duct opening measurement only)

+ Product Details Size - 24"w X 28"h is the size for the duct opening measurement only

+ Product Details Size – 12"w X 26"h is the size for the duct opening measurement only

Constructed from high-impact

28" x 16" Cube Core Eggcrate Return Air Filter Grille for 1" Filter ceiling Installing the plaster frame is+ Product Details Perfect Fit & Easy Sizing Designed for a 28" x 16" OR 16" x 28" duct opening (measured at the opening), with actual outer dimensions of 30. 5" W x 18. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 27. 75" x 15. 75" x 1" Premium Airflow Efficiency High performance cube core eggcrate design allows 95% airflow efficiency, reducing energy costs and maximizing HVAC system lifespan. Durable, Rust Free Aluminum