20" x 34" or 34" x 20" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Return even without needing to remove

even without needing to remove the thermostat

Drop Ceiling HVAC Supply Grille - For T-Bar Lay-In - 3 Coned - 24" x 24" - For 8" Vent Connection - Black

actual front end outer dimensions are approximately 22 5/8" width X 14 5/8" height

+ Product Details Size – 34"w X 26"h is the size for the duct opening measurement only

20" x 34" or 34" x 20" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Return even without needing to remove+ Product Details Perfect Fit & Easy Sizing Designed for a 20" x 34" OR 34" x 20" duct opening (measured at the opening), with actual outer dimensions of 22. 5" W x 36. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 19. 75" x 33. 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