Actual Front End Outer Dimensions Are 16" Diameter
+ Product Details Size – 16" x 16" is the size for the duct opening measurement only
+ Product Details Size – 36"w X 18"h is the size for the duct opening measurement only
It is compatible with 8" duct
HVAC Premium Left Cut Aviation Snips - Metal, Tin Cutting Shears Return Grille Actual Front End Outer DimensionsProfessional Aviation Snips Perfect for Tile, Bolt, Tin, Metal, Roofing, Siding, Wire, Sheet Metal, Branch, Duct, DIY, Home Improvement, etc Cutting HEAVY DUTY CUTTERS These Left Cut Aviation Snips have a SawTooth Design, Edge Serration that can cut Stainless Steel below 0. 6mm or Iron Plate below 1. 2mm Cut Iron Like Paper SHARP SNIPS Head, forged with 50 CR V Chrome Vanadium Steel for superior strength Cutting Edges and Optimal Durability EASY