16" x 26" or 26" x 16" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Ceiling accordion-title:hover { background-color: #f0f0f0

accordion-title:hover { background-color: #f0f0f0

+ Product Details Size - 18"w X 8"h is the size for the duct opening measurement only

+ Product Details Size – 10" x 32" or 32" x 10" is the size for the duct opening measurement only

Actual Front End Outer Dimensions Are 16" Width X 4" Height - SEE IN DESCRIPTION HOW TO MEASURE A GRILLE

16" x 26" or 26" x 16" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Ceiling accordion-title:hover { background-color: #f0f0f0+ Product Details Perfect Fit & Easy Sizing Designed for a 16" x 26" OR 26" X 16" duct opening (measured at the opening), with actual outer dimensions of 18. 5" W x 28. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 15. 75" x 25. 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