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

+ Product Details Size - 10"w X 30"h X 2"d (for duct opening measurement only)

actual front end outer dimensions are approximately 26 5/8" width X 12 5/8" height -

+ Product Details Size & Compatibility – The galvanized sheet metal oval stack head is compatible with Duct 8"

HIGH QUALITY & DURABLE – Made of UV AND Fire Resistant ABS Plastic – UL-94V-0 Equivalent

It is compatible with duct 5"

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