28" x 18" Cube Core Eggcrate Return Air Filter Grille for 1" Filter return filter Actual Filter Size – 11

Actual Filter Size – 11 3/4"w x 19 3/4" x 1"

Actual Filter Size – 25 3/4"w x 27 3/4" x 1"

+ Product Description Introducing the 6" Butterfly Damper – Your Solution for Controlled Airflow

These grilles and registers give you an extra measure of quality that are visible to your family members and house guests

Designed for both wall and ceiling applications

28" x 18" Cube Core Eggcrate Return Air Filter Grille for 1" Filter return filter Actual Filter Size – 11+ Product Details Perfect Fit & Easy Sizing Designed for a 28" x 18" OR 18" x 28" duct opening (measured at the opening), with actual outer dimensions of 30. 5" W x 20. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 27. 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