26" x 36" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Fixed Blades + Product Details Size –

+ Product Details Size – 14"w X 12"h is the size for the duct opening measurement only

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

+ Product Details Size - 34"w X 22"h is the size for the duct opening measurement only

+ Product Details Size – 22"w X 24"h is the size for the duct opening measurement only

if your hole is 20" wide by 14" tall

26" x 36" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Fixed Blades + Product Details Size –+ Product Details Perfect Fit & Easy Sizing Designed for a 26" x 36" OR 36" x 26" duct opening (measured at the opening), with actual outer dimensions of 28. 5" W x 38. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 25. 75" x 35. 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