12" x 24" or 24" x 12" Cube Core Eggcrate Return Air Grille Insulated Line 85" width X 21

85" width X 21

Design – Unrestricted airflow for your HVAC system - adjustable one-way louver with full horizontal airflow directional control - single deflection supply grill with 96% airflow - noise free components - no vibrating louvers etc

R value rating of insulation - R3

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12" x 24" or 24" x 12" Cube Core Eggcrate Return Air Grille Insulated Line 85" width X 21+ Product Details Size 12" x 24" or 24" x 12" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 13. 75" X 25. 75". High Quality High quality, rust free aluminum construction with smooth finished edges and counter sunk screw holes (screws included); no sharp edges.. Installation Location sidewall and ceiling. Design Cubic core eggcrate design Offers highest airflow efficiency at almost 95%, reducing