Specifications include, but are not limited to: provide and install high volume, low speed (HVLS) fans at each practice court within the SCSC Arena. Two (2) practice courts with two (2) HVLS fans/court. ; 1. Impeller shall be constructed of aerodynamic extruded aluminum airfoil blades connected to machined aluminum struts that are rigidly attached to a heavy-duty, laser-cut aluminum hub. All connections shall be made using a minimum of SAE Grade 8 hardware. 2. Airfoil blades shall be interlocked with one another and the impeller hub via a heavy-duty steel airfoil retaining ring for safety. Airfoil retaining ring shall be constructed of heavy gauge steel and installed at the factory to ensure proper function. Field-installed airfoil retainers shall not be accepted. ; 1. Motor enclosure: IP54 2. Motors shall be of the high torque, low speed direct drive type, carefully matched to the fan load and furnished at the specified voltage and phase. High speed motors provided with a gearbox to reduce the operating speed of the fan shall not be permitted. 3. Motors shall be an external rotor design. Internal rotor motors shall not be permitted. 4. Motors shall be of the brushless DC type for maximum efficiency and speed controllability. No other motor type shall be accepted.