"Cross Flow Fan" in accordance with AMCA 210-85 "Laboratory Methods of Testing Fans for Rating" test specifications. As shown little fan placed in the hole the wind, the wind into the wind tunnel, the flow field through each measurement point test air flow and static pressure, via computer aggregated characteristic diagram plotted with data measured after information. Fan air volume is increased in parallel, but the static pressure constant; if the system impedance is low, can be used in parallel. We do not recommend the use of the fan taken in series.