We are offering ventilators, roof ventilators, wind turbine ventilators, roof turbine ventilators, vertical roof ventilators and industrial roof ventilators. Features: * helps prolong life of insulation, shingles, roofing material and rafters * precision balanced, low inertia head design, turns in the slightest breeze. * smooth and quite operations. * attractive low profile design. * ribbed design adds strength. * high speed limiting device protects against high wind and to shed water.