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

+ Product Details Size - 36"w X 32"h is the size for the duct opening measurement only

high-impact plastic to provide reliable and long-lasting protection for your thermostat

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

ensuring your space stays dry and secure

+ Product Details Size - 18"w X 18"h X 2"d (for duct opening measurement only)

32" x 32" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Aluminum - Cube Core + 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