The CSRV0204FTDG1600 is a Viking industrial rotary flow-through fan with a 1/2" NPT inlet and outlet. It is designed to provide high-velocity, bi-directional airflow, and is ideal for use in heating, ventilation, and air conditioning (HVAC) systems, as well as heat recovery systems and circulation fans. The fan features a quiet operation and low power consumption, and has a durable, corrosion-resistant construction. The enclosed type motor operates efficiently and is mounted directly to the housing. It has a maximum operating temperature of 175°F (80°C) and a maximum ambient temperature of 140°F (60°C), making it suitable for most commercial and industrial applications.