16" x 22" or 22" x 16" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Aluminum Bar Actual Filter Size – 19

Actual Filter Size – 19 3/4"w x 15 3/4" x 1"

Actual Filter Size – 11 3/4"w x 5 3/4" x 1"

+ Product Details Size - 8"w X 36"h is the size for the duct opening measurement only

Ideal for Walls & Ceilings: Designed for seamless installation in standard 20" X 4" duct openings

and with a built-in back 1/2" mesh they also protect you from annoying rodents like mice

16" x 22" or 22" x 16" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Aluminum Bar Actual Filter Size – 19+ Product Details Perfect Fit & Easy Sizing Designed for a 16" x 22" OR 22" X 16" duct opening (measured at the opening), with actual outer dimensions of 18. 5" W x 24. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 15. 75" x 21. 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