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Today's Hours 8am - 11pm estThe SLW Series from Triangle Fans delivers robust, efficient ventilation for agricultural buildings, greenhouses, barns, and other large-space environments — engineered to move stagnant air, push out humidity or heat, and bring fresh circulation where it’s needed most. Built on decades of experience and rugged construction, these Slant Wall fans are ideal when you need reliable airflow in demanding conditions, from livestock barns to greenhouse ventilation or general farm ventilation.