18" Diameter - 90° Degree Adjustable Elbow - 1 PACK Curved Blade Steel this easy-to-install grille fits seamlessly

this easy-to-install grille fits seamlessly into any standard return filter opening

+ Product Details Perfect Fit & Easy Sizing - Designed for a 16" x 12" OR 12" X 16" duct opening (measured at the opening)

+ Product Details Size - 6"w X 8"h is the size for the duct opening measurement only

+ Product Details Size - 6"w X 28"h is the size for the duct opening measurement only

+ Product Details Size – 22"w X 30"h is the size for the duct opening measurement only

18" Diameter - 90° Degree Adjustable Elbow - 1 PACK Curved Blade Steel this easy-to-install grille fits seamlessly+ Product Details Size 18" round duct sheet metal elbow 30 gauge galvanized crimped end connection adjustable from 5 90 Premium Quality Made of galvanized metal to prevent corrosion, oxidation & rust from water & moisture that lasts longer requiring less maintenance Save money with this energy efficient material, maximizes airrflow and reduces fire hazards. Applications 30 Gauge thick & made of thick & durable galvanized sheet metal used for HVAC