34" x 18" Cube Core Eggcrate Return Air Filter Grille for 1" Filter return filter this thermostat guard is compatible

this thermostat guard is compatible with most standard thermostat models

+ Product Details Size - 8" X 8" is the size for the duct opening measurement only

+ Product Details Size - 18"w X 10"h is the size for the duct opening measurement only

Heavy Gauge Steel – Heavier gauge than needed

actual front end outer dimensions are approximately 26 5/8" width X 10 5/8" height -

34" x 18" Cube Core Eggcrate Return Air Filter Grille for 1" Filter return filter this thermostat guard is compatible+ 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