In controlled environments where a precise tempering of air is critical to production, American Coolair offers the Power Tube Fan greenhouse cooling system.~

Coolair Power Tube Fans are specially designed units developed for compatibility with polyethylene tubes. For the necessary low velocity tempering of air, these greenhouse ventilation fans and tubes are perfectly matched.

Construction

Constructed of heavy gauge steel, the Coolair Power Tube Fan is offered in diameters from 12 to 30 inches. The 12 and 18 inch fans are direct drive units. The 24 and 30 inch fans are belt driven and incorporate the Coolair exclusive stationary shaft design from the Coolair NBF type units. Belt drive models have two sealed lifetime lubricated oversized shaft bearings. The fanjet propellers have six steel die formed blades. All Power Tube Fans employ air straightener vanes for efficient air distribution. All Coolair motors are of heavy duty type, totally enclosed, for fan operation. They employ sealed ball bearings for continuous trouble-free performance.
Fan Jet Systems, or power tube fans, include the fan housing, fan, motor (115/230V), motorized air inlet shutter, and heat kit (the 12" does not use a heat kit). Order poly tube, cable and hangers separately for tube fan ventilation. Guards are optional but highly recommended and are not included in the prices below.