34" x 16" Cube Core Eggcrate Return Air Filter Grille for 1" Filter sidewall If your hole is 14"

If your hole is 14" wide by 20" tall

+ Product Details Size - 26"w X 24"h is the size for the duct opening measurement only

75" Width X 17

actual front end outer dimensions are approximately 12 5/8" width X 8 5/8" height -

the actual front end outer dimensions are 10" in diameter

34" x 16" Cube Core Eggcrate Return Air Filter Grille for 1" Filter sidewall If your hole is 14"+ Product Details Perfect Fit & Easy Sizing Designed for a 34" x 16" Or 16" x 34" duct opening (measured at the opening), with actual outer dimensions of 36. 5" W x 18. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 33. 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