36" x 28" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 6" Round Duct Pipe this thermostat guard combines dependable

this thermostat guard combines dependable security with a professional and attractive appearance

+ Product Details Perfect Fit & Easy Sizing - Designed for a 12" x 24" or 24" x 12" duct opening (measured at the opening)

75"H – fits a 14" X 4" duct opening

Actual Filter Size – 33 3/4"w x 9 3/4" x 1"

+ Product Details Size – 22" x 36" or 36" x 22" is the size for the duct opening measurement only

36" x 28" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 6" Round Duct Pipe this thermostat guard combines dependable+ Product Details Perfect Fit & Easy Sizing Designed for a 36" x 28" OR 28" x 36" duct opening (measured at the opening), with actual outer dimensions of 38. 5" W x 30. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 35. 75" x 27. 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