Since 1937, Quietaire Corporation IS quality ventilation equipment that lives up to its name. Roof/wall fans, supply/exhaust, 10" to 86." Quietaire Cooling offers Quietcool brand Portable Evaporative Coolers. From personal units 18" to shop size units 36" & 48" cools for pennies a day compared to A/C. Explosion Proof. and export models available.