Aluminum Turbine Ventilator, 12-In.

Permanently lubricated upper and lower ball bearings that ensure long life and no maintenance All-aluminum rust-free construction Rigid spider-type structure Riveted at every connection 21 air-foil curved vanes with rolled vane edges to deflect water Exclusive vari-pitch base adjusts to 12/12 roof pitch large flashing for easy installation Tested to withstand winds of 147 MPH Forever guarantee-residential use only Length: 20 Width: 17.25 Height: 20- SKU: JNSN40884

12-inch whirlybird turbine ventilator ensures long life and no maintenance Reduces winter ice build-up and energy bills; withstands winds up to 147 MPH 21 air-foil curved vanes with rolled vane edges to deflect water Vari-pitch base adjusts to a 12/12 roof pitch Lifetime warranty