25" X 14" ALUMINUM RETURN FILTER GRILLE FOR 1" FILTER - EASY AIRFLOW - LINEAR BAR GRILLE Compatible with Duct 8" this blank box is the

this blank box is the perfect solution for new constructions or system upgrades

Insulation is made of 1/2" Polypropylene and is UV Resistant

+ Product Details Size - 30"w X 12"h is the size for the duct opening measurement only

Premium Quality – Our duct stick-on collar with damper has made of high-quality galvanized steel metal for durability and rust prevention

+ Product Details Size - 18"w X 26"h X 2"d (for duct opening measurement only)

25" X 14" ALUMINUM RETURN FILTER GRILLE FOR 1" FILTER - EASY AIRFLOW - LINEAR BAR GRILLE Compatible with Duct 8" this blank box is the+ Product Details Size 25"w X 14"h is the size for the duct opening measurement only, [Outer Dimensions: 27. 5"w X 16. 5"h] Actual Filter Size 24 3 4"w x 13 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,