Shiv Ref-Air India LLP

A "4D 450 Hi Cool Large Axial Fan 400mm" is a heavy-duty industrial cooling fan, part of Hicool's product line, featuring an 18-inch (450mm) blade, designed for high airflow in large spaces like factories, condensers, or clean rooms, using an axial (straight-through) flow for ventilation, often powered by AC, and noted for efficiency in demanding temperatures. The '4D' indicates a model type (likely '4-pole, Direct Drive'), '450' refers to the size in millimeters (or 18 inches), and 'Hi Cool' is the brand, moving large air volumes parallel to the fan shaft. 

A 4E-350 HiCool Large Axial Fan is a powerful industrial cooling/ventilation fan, 350mm (14-inch) in size, designed for moving large volumes of air in factories, HVAC, or agricultural settings, featuring a durable metal build, efficient external rotor motor, and suitable for both suction and blow-through applications, offering high airflow for demanding industrial cooling needs.