Double ribbed vanes, with convex top, direct even wind-driven rain away from the unit.
Heavy-duty steel spider braces and case-hardened steel shaft for long-lasting strength/durability.Pre-punched bottom/crimped collar of one-piece base fits tighter, makes installation easier and allows for adjustability up to 12/12 pitch without removing turbine. Simple, mechanically-locked, two-piece head/base for faster, easier installation. Dade County/Texas Department of Insurance approved.