Double inlet centrifugal fans          The range presented in this chapter consists of centrifugal double inlet fans. In response to your specific needs, the air flow, power, rotational speeds (multispeed by windings or by controllers), noise level, overall dimensions and finish... of the fans can be specifically defined according to your requirements.    Data sheets             General conditions of use Centrifugal fans with forward-curved impeller blades demand maximum motor power at maximum air flow rate and zero static pressure. Certain fan models have minimum pressure levels below which their motors will over-heat. Performance curves then terminate at minimum permitted pressure. Finger guards are available upon request. ECOFIT motors are speed controllable by voltage variation, but where electronic controllers are used they must be designed for electric motor duty and be compatible with ECOFIT products. Capacitors must be of the "motor run" type and be of the recommended value, voltage rating, and life expectancy. The purchaser must test for motor total temperature in the application, with the worst operating conditions for the motor. ECOFIT should then validate the test results.