Suggested Retail: $53        MASTER FLOW 12 in. Weathered Wood Galvanized Internally Braced Dual-Bearing Wind Turbine. The GAF Master Flow internally braced turbines are efficient, easy-to-install venting options for your roof. They allow heat and moisture-laden air to escape your attic, helping to extend the life of your roof. They are designed with upper and lower steel ball bearing systems for years of trouble-free operation. The adjustable base allows for installation on virtually any roof, from 2:12 pitch up to 12:12 pitch. Galvanized construction Weathered wood finish Simple, mechanically locked, 2-piece design (Head and base) - allows for faster, easier installation Base also has extra-large flashing for easier installation and superior weather protection Head has heavy-duty steel spider braces for strength and durability Dual-bearing system with encased design helps to prevent dirt, dust, sand and other foreign materials from damaging the bearing, resulting in a smother spin Permanently lubricated track system of dual bearing system ensures years of trouble-free spinning Up to 500 sq. ft. with NFA 120 sq. in. minimum" 7 DAY FULL REFUND GUARANTEE ON THIS ITEM IF ANY ISSUE IS FOUND THAT WAS NOT DESCRIBED/PICTURED. 7 DAY STORAGE IS ALSO AVAILABLE. SEE NOTES TO BIDDER, IN AUCTION DETAILS, AT THE TOP OF PAGE 1 FOR MORE INFO.