16" x 34" or 34" x 16" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Filter Grille + Product Details Size –

+ Product Details Size – 20"w X 28"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 22 5/8" width X 18 5/8" height

actual front end outer dimensions are approximately 28 5/8" width X 28 5/8" height

ensuring optimal circulation throughout your space

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

16" x 34" or 34" x 16" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Filter Grille + Product Details Size –+ Product Details Perfect Fit & Easy Sizing Designed for a 16" x 34" OR 34" X 16" duct opening (measured at the opening), with actual outer dimensions of 18. 5" W x 36. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 15. 75" x 33. 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