Wind-Driven Turbine Exhaust Ventilator: 10 1/4 in Head Dia, 4 in Throat Dia, 126 cfm @ 4 mph, Steel Sub-woofer Drive Size / Impedance:

Sub-woofer Drive Size / Impedance: 6

SIZE           20"

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Wind-Driven Turbine Exhaust Ventilator: 10 1/4 in Head Dia, 4 in Throat Dia, 126 cfm @ 4 mph, Steel Sub-woofer Drive Size / Impedance:Wind Driven Turbine Exhaust Ventilator: 10 1 4 in Head Dia, 4 in Throat Dia, 126 cfm @ 4 mph, Steel Brand EMPIRE Throat Diameter 4 in Overall Height 12 in Overall Width 10 1 4 in Airflow @ 4 mph126 cfm Bearing Type Lower Thrust Ball Bearing; Oilless Bronze Upper Bearing Housing Finish Galvanized Housing Material Steel Installation Requirements Base for New Installations; Flashing Weight5 lb Manufacturer Part NumberTV04G Head Diameter10 1 4 in