16" x 28" or 28" x 16" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Color_R-8.0 Pink Ideal for Walls & Ceilings:

Ideal for Walls & Ceilings: Designed for seamless installation in standard duct openings

+ Product Details Size - 36"w X 20"h is the size for the duct opening measurement only

and 4-way configurations

actual front end outer dimensions are approximately 23 5/8" width X 7 5/8" height

color: #fff

16" x 28" or 28" x 16" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Color_R-8.0 Pink Ideal for Walls & Ceilings:+ Product Details Perfect Fit & Easy Sizing Designed for a 16" x 28" OR 28" X 16" duct opening (measured at the opening), with actual outer dimensions of 18. 5" W x 30. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 15. 75" x 27. 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