Since 1937, Quietaire Corporation has built quality ventilation equipment that lives up to its name. Roof or wall fans, supply or exhaust, 500 cfm to 127,000 cfm, we move air!! Our subsiderary, Quietaire Cooling offers Quietcool brand Portable Evaporative Coolers, sizes 18" to 48." Hazardous location units avaiable . and export models available.