22" x 36" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Adjustable Return + Product Details Size –

+ Product Details Size – 28"w X 22"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 16 5/8" width X 16 5/8" height

this guard ensures long-lasting protection and security

+ Product Details Size - 28"w X 30"h is the size for the duct opening measurement only

22" x 36" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Adjustable Return + Product Details Size –+ Product Details Perfect Fit & Easy Sizing Designed for a 22" x 36" OR 36" x 22" duct opening (measured at the opening), with actual outer dimensions of 24. 5" W x 38. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 21. 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