Master Flow AIC14BL Rotary Turbine Ventilator, 14 in Dia Throat, Aluminum, Black

Permanently lubricated track system, upper and lower stainless steel ball bearings prevents metal-to-metal contact, encased to help prevent dirt, dust, sand and other foreign materials from damaging bearings for long life, less friction, smoother spin and wear resistance. Heavy-duty steel spider braces and case-hardened steel shaft for long-lasting strength/durability. Simple, mechanically-locked, two-piece head/base for faster, easier installation. 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. Extra-large flashing and head with included bottom ring for easier installation and better weather protection. Double ribbed vanes, with convex top, direct even wind-driven rain away from the unit. Dade County/Texas Department of Insurance approved. Features: - Head, heavy-duty steel spider braces for strength and durability - Bottom ring included for easier and faster installation on base and great weather protection - Dual bearing system, encased design helps to prevent dirt, dust, sand and other foreign materials from damaging the bearings, resulting in a smoother spin - Permanently lubricated track system insures years of trouble-free spinning - Special design prevents metal-to-metal contact results in less friction for a truer, smoother spin and great wear resistance - Shaft, case hardened steel for long lasting strength and durability - Base, pre-punched bottom and crimped collar fits tighter, makes installation easier - One-piece design for easy adjustability up to 12:12 pitch without removing turbine - Extra-large flashing for easier installation and great weather protection - Quiet and durable, exclusive stainless dual bearing system for durable, long-lasting smooth and silent operation