30" X 10" ALUMINUM RETURN FILTER GRILLE FOR 1" FILTER - EASY AIR FLOW - LINEAR BAR GRILLES 4in diameter And is classified as Class

And is classified as Class 1 Fire Proof - B1

transparent design and durable construction

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actual front end outer dimensions are approximately 27 5/8" width X 34 5/8" height -

+ Product Details Perfect Fit & Easy Sizing - Designed for a 14" x 26" OR 26" X 14" duct opening (measured at the opening)

30" X 10" ALUMINUM RETURN FILTER GRILLE FOR 1" FILTER - EASY AIR FLOW - LINEAR BAR GRILLES 4in diameter And is classified as Class+ Product Details Size 30"w X 10"h is the size for the duct opening measurement only, [Outer Dimensions: 32. 5"w X 12. 5"h] Actual Filter Size 29 3 4"w x 9 3 4" x 1" High Quality High quality rust free, strong aluminum construction with smooth finished edges for easy and safe use; Filter grille features a user friendly plastic latch that requires no screwdriver for opening. Installation Location Sidewall and ceiling. Design Heavier gauge than needed,