32" x 32" Cube Core Eggcrate Return Air Filter Grille for 1" Filter return filter + Product Details Size -

+ Product Details Size - 16"w X 10"h is the size for the duct opening measurement only

Tamper-Proof Locking Mechanism – Includes an eight-tumbler lock with a supplied key to prevent unauthorized access

+ Product Details Size - 36"w X 6"h is the size for the duct opening measurement only

featuring a 8" round duct opening

actual front end outer dimensions are approximately 28 5/8" width X 22 5/8" height

32" x 32" Cube Core Eggcrate Return Air Filter Grille for 1" Filter return filter + Product Details Size -+ Product Details Perfect Fit & Easy Sizing Designed for a 32" x 32" duct opening (measured at the opening), with actual outer dimensions of 34. 5" W x 34. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 31. 75" x 31. 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 Made from