34" x 18" Cube Core Eggcrate Return Air Filter Grille for 1" Filter return filter + Product Details Perfect Fit

+ Product Details Perfect Fit & Easy Sizing - Designed for a 6" x 22" or 22" x 6" duct opening (measured at the opening)

this thermostat guard is compatible with most standard thermostat models

+ Product Details Perfect Fit & Easy Sizing - Designed for a 6" x 10" or 10" x 6" duct opening (measured at the opening)

+ Product Details Size – 14"w X 22"h is the size for the duct opening measurement only

Heavy Gauge Steel – Heavier gauge than needed

34" x 18" Cube Core Eggcrate Return Air Filter Grille for 1" Filter return filter + Product Details Perfect Fit+ Product Details Perfect Fit & Easy Sizing Designed for a 34" x 18" Or 18" x 34" duct opening (measured at the opening), with actual outer dimensions of 36. 5" W x 20. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 33. 75" x 17. 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