16" X 12" ALUMINUM RETURN FILTER GRILLE FOR 1" FILTER - EASY AIRFLOW - LINEAR BAR GRILLES 4in diameter + Product Details Size –

+ Product Details Size – 18" x 30" or 30" x 18" is the size for the duct opening measurement only

Actual Filter Size – 35 3/4"w x 31 3/4" x 1"

+ Product Details Size - 12"w X 22"h is the size for the duct opening measurement only

+ Product Details 20" x 30" x 1" replacement air filters for your furnace

16" X 12" ALUMINUM RETURN FILTER GRILLE FOR 1" FILTER - EASY AIRFLOW - LINEAR BAR GRILLES 4in diameter + Product Details Size –+ Product Details Size 16"w X 12"h is the size for the duct opening measurement only, [Outer Dimensions: 18. 5"w X 14. 5"h] Actual Filter Size 15 3 4"w x 11 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,