Brand EMPIRE Throat Diameter 12 in Overall Height 17 in Overall Width 19 in Airflow @ 4 mph 631 cfm Bearing Type Lower Thrust Ball Bearing; Oilless Bronze Upper Bearing Housing Finish Galvanized Housing Material Steel Installation Requirements Base for New Installations; Flashing Weight 13 lb Manufacturer Part Number TV12G Head Diameter 19 in UNSPSC 40101503 Country of Origin USA (subject to change) Product Description 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.
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