blaux portable air cooler replacement water curtain - cordless air cooler humidifier rapid cooling fan blaux refresh your space with ease with the <b>blaux replaceable water curtain</b>. it uses an innovative evaporative cooling system to bring you colder, cleaner air than ever before. it sucks in air and filters it through the water curtain, cooling the air, while also absorbing dust. always keeping the air fresh, cool, and clean.