Air movement on individual workers makes a big impact on cooling effect.

Effective Temperatures:

Effective temperature is influenced by several factors, among these are: air temperature, air moisture level and air movement.

For example if our scenario is a warehouse in Phoenix:

        Outside:     108ºF and 13% relative humidity

        Ventilation System assume an air movement of 50 feet per minute (fpm)

                                        Effective temperature =          84ºF

        Direct Portable Evaporative Cooler

                                        Supply Air Temperature =     78ºF

                                        Effective Temperature =        71.5ºF at 200 fpm

                                                                                              68.5ºF at 500 fpm