LL Building Products AIC14BL Internally Braced Turbine Ventilator, 14", Black Microwave The pendulum system locks when

The pendulum system locks when switched off

Base Material: Polyurethane

14-7/8"Closed-19-5/8"Extended

warm or cold weather

LL Building Products AIC14BL Internally Braced Turbine Ventilator, 14", Black Microwave The pendulum system locks whenPermanently 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, 2 piece head base for faster, easier installation.