Influence of temperature on MTBF and service life
The curves refer to continuous operation at nominal voltage and constant temperature and are average values. With fans, the temperature of the conveyed air is the reference temperature. The end of the service life is defined by exceeding the noise limit or the reduction of the initial speed by >= 30%.
Unfavorable environmental conditions, chemical or mechanical air contamination or heavy vibrations can have an unfavorable effect on service life.
MAX. VOLUME CURRENT
Volume of air that a fan can convey when
operating at nominal voltage and at an ambient
temperature of 25°C, at a pressure 0
Maximum pressure difference that a fan can build up when operating at nominal voltage and at an ambient temperature of 25°C, with a volume flow
The two basic parameters, max. volume flow and max. pressure, describe a fan only imperfectly, since under normal operating conditions neither pressure nor volume flow are zero and the characteristic curve between the two basic parameters is not linear. As a result, there may be considerable differences in the delivery rate despite identical specifications for the free-blowing volume flow. The actual conveying capacity of the fans must be determined in practical tests or by simulation.