18" X 20" ALUMINUM RETURN FILTER GRILLE FOR 1" FILTER - EASY AIRFLOW - LINEAR BAR GRILLES w20h20 + Product Details Size &

+ Product Details Size & Compatibility – The 5" Galvanized Sheet Metal 90 Degree Oval Vertical Angle Elbow is compatible with Duct 5"

actual front end outer dimensions are approximately 25" width X 25" height -

we recommend purchasing one of our HVAC access doors

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18" X 20" ALUMINUM RETURN FILTER GRILLE FOR 1" FILTER - EASY AIRFLOW - LINEAR BAR GRILLES w20h20 + Product Details Size &+ Product Details Size 18"w X 20"h is the size for the duct opening measurement only, [Outer Dimensions: 20. 5"w X 22. 5"h] Actual Filter Size 17 3 4"w x 19 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,