The deep hood prevents rain water from entering in strong winds. Uses NSS442M3 stainless steel for corrosion resistance. Material: NSS442M3 (main unit/gala/hood); Wire Mesh: 12M (sus304); Ideal for outdoor air supply hoods; Nominal Size: φ150 Finish: MB (metallic brown); Size A: 9.1 inches (230 mm); Dimensions (inches): 5.7 inches (160 mm); Dimensions (in inches): 60 F Dimensions (in inches): 25 Equivalent opening area: 2):53.95