16" x 6" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Powder-Coat 75"H – fits a 20"

75"H – fits a 20" X 4" duct opening

+ Product Details Size - 4"w X 22"h is the size for the duct opening measurement only

this guard is designed to provide maximum protection against tampering while maintaining a clean and professional appearance

Actual Filter Size – 33 3/4"w x 21 3/4" x 1"

+ Product Details Perfect Fit & Easy Sizing - Designed for a 26" x 16" OR 16" x 26" duct opening (measured at the opening)

16" x 6" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Powder-Coat 75"H – fits a 20"+ Product Details Perfect Fit & Easy Sizing Designed for a 16" x 6" OR 6" X 16" duct opening (measured at the opening), with actual outer dimensions of 18. 5" W x 8. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 15. 75" x 5. 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 Made