18" x 24" or 24" x 18" Cube Core Eggcrate Return Air Grille Compatible with Duct 10" Actual Filter Size – 17 Compatible With Duct 7in Applications This sheet metal DDAG-A-1212

Actual Filter Size – 17 3/4"w x 7 3/4" x 1"

+ Product Details Perfect Fit & Easy Sizing - Designed for a 10" x 34" or 34" x 10" duct opening (measured at the opening)

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And is classified as Class 1 Fire Proof - B1

High Standard Quality - Every part is hand inspected for quality before it is packaged

18" x 24" or 24" x 18" Cube Core Eggcrate Return Air Grille Compatible with Duct 10" Actual Filter Size – 17 Compatible With Duct 7in Applications This sheet metal DDAG A 1212 Actual Filter Size – 17 3 4"w x 7 3 4" x 1" + Product Details Perfect Fit & Easy Sizing Designed for a 10" x 34" or 34" x 10" duct opening (measured at the opening)