14" X 6" ALUMINUM RETURN FILTER GRILLE FOR 1" FILTER - EASY AIRFLOW - LINEAR BAR GRILLES Width_20in + Product Details Size -

+ Product Details Size - 18"w X 16"h is the size for the duct opening measurement only

+ Product Details Size - 8"W X 6"H is (for duct opening measurement only)

+ Product Details Size - 22"w X 10"h is the size for the duct opening measurement only

What does this mean

+ Product Details Size - 44"W X 4"H is (for duct opening measurement only)

14" X 6" ALUMINUM RETURN FILTER GRILLE FOR 1" FILTER - EASY AIRFLOW - LINEAR BAR GRILLES Width_20in + Product Details Size -+ Product Details Size 14"w X 6"h is the size for the duct opening measurement only, [Outer Dimensions: 16. 5"w X 8. 5"h] Actual Filter Size 13 3 4"w x 5 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,