Greenheck Fan Law Calculator gives you the capability to quickly determine new flow rates when performance changes need to be done to an existing unit. Simply input the existing specifications for rpm, cfm, static pressure, and horse power. Next input the desired performance (cfm or rpm) and the remaining values will automatically calculate using standard fan laws.格林范法计算器,使您能够迅速确定新的流速性能变化时,需要完成现有单位。只需输入转速,CFM,静压力,马力已有的规范。下一个输入所期望的性能(cfm或每分钟转速)和其余的值将自动计算使用标准风扇法律。