Wind-Driven Turbine Exhaust Ventilator: 19 in Head Dia, 12 in Throat Dia, 631 cfm @ 4 mph, Steel

Wind-Driven Turbine Exhaust Ventilator: 19 in Head Dia, 12 in Throat Dia, 631 cfm @ 4 mph, Steel Wind-driven turbine fans help ventilate structures without using electricity. As the wind blows, it turns the turbine and creates negative pressure. This low pressure draws hot air out of the structure and pulls in fresh air through openings in the structure. Brand   EMPIRE Throat Diameter   12 in Overall Height   17 in Overall Width19 in Airflow @ 4 mph631 cfm Bearing Type   Lower Thrust Ball Bearing; Oilless Bronze Upper Bearing Housing Finish   Galvanized Housing Material   Steel Installation Requirements  Base for New Installations; Flashing Weight13 lb Manufacturer Part NumberTV12G Head Diameter19 in UNSPSC40101503 Country of Origin  USA Item 2C531 Mfr. Model TV12G