36" X 18" ALUMINUM RETURN FILTER GRILLE FOR 1" FILTER - EASY AIRFLOW - LINEAR BAR GRILLES Width_24in + Product Details Size -

+ Product Details Size - 12"w X 36"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 36 5/8" width X 10 5/8" height

Don’t worry

1 piece of insulation tape

+ Product Details Size - 32"w X 20"h X 2"d (for duct opening measurement only)

36" X 18" ALUMINUM RETURN FILTER GRILLE FOR 1" FILTER - EASY AIRFLOW - LINEAR BAR GRILLES Width_24in + Product Details Size -+ Product Details Size 36"w X 18"h is the size for the duct opening measurement only, [Outer Dimensions: 38. 5"w X 20. 5"h] Actual Filter Size 35 3 4"w x 17 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,