30" x 20" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Color_Anodized Aluminum this guard is designed to

this guard is designed to provide maximum protection against tampering while maintaining a clean and professional appearance

Location – Sidewall and ceiling

actual front end outer dimensions are approximately 32 5/8" width X 36 5/8" height

no professional tools needed

ensuring compatibility with most thermostat models

30" x 20" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Color_Anodized Aluminum this guard is designed to+ Product Details Perfect Fit & Easy Sizing Designed for a 30" x 20" OR 20" x 30" duct opening (measured at the opening), with actual outer dimensions of 32. 5" W x 22. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 29. 75" x 19. 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