16" x 36" or 36" x 16" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Curved Blade Steel Whether you choose the modern

Whether you choose the modern contemporary

actual front end outer dimensions are approximately 14 5/8" width X 20 5/8" height

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

75"H – fits a 14" X 12" duct opening

actual front end outer dimensions are approximately 24 5/8" width X 38 5/8" height

16" x 36" or 36" x 16" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Curved Blade Steel Whether you choose the modern+ Product Details Perfect Fit & Easy Sizing Designed for a 16" x 36" OR 36" X 16" duct opening (measured at the opening), with actual outer dimensions of 18. 5" W x 38. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 15. 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