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2. 15 products to help you stay cool in the extreme heat: 'A ...

   www.aol.com/lifestyle/products-to-help-you-stay...

   COMLIFE Portable Handheld Misting Fan. $20 at Amazon. ... This misting fan is rechargeable battery operated and foldable, so you can set it up on a table or desk in front of you if and when you ...

3. This Best-Selling Portable Cooling Fan a ‘Life Saver’—and It ...

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   The Jisulife Handheld Mini Fan is nearly half-off ahead of Amazon Prime Day. It’s portable, effective, and essential in battling heat wave fatigue. This Best-Selling Portable Cooling Fan a ...

4. Evaporative cooler - Wikipedia

   en.wikipedia.org/wiki/Evaporative_cooler

   A fan blows a fine mist of water into the air. If the air is not too humid, the water evaporates, absorbing heat from the air, allowing the misting fan to also work as an air cooler. A misting fan may be used outdoors, especially in a dry climate. It may also be used indoors. Small portable battery-powered misting fans, consisting of an ...

5. Humidifier - Wikipedia

   en.wikipedia.org/wiki/Humidifier

   Usually the mist gets forced out by a tiny fan, while some ultra mini models have no fans. The models without fans are meant mainly for personal use. Ultrasonic humidifiers use a piezoelectric transducer to create a high frequency (1-2 MHz [15]) mechanical oscillation in a film of water. This forms an extremely fine mist of droplets about one ...

6. Kerosene heater - Wikipedia

   en.wikipedia.org/wiki/Kerosene_heater

   Most heaters contain a battery-operated or piezo-electric ignitor to light the heater without the need for matches. If the ignitor should fail the heater can still be lit manually. The Japanese non-vented "fan" heater burns kerosene gas and is known as a gasification type heater.

7. Ducted fan - Wikipedia

   en.wikipedia.org/wiki/Ducted_fan

   In aeronautics, a ducted fan is a thrust-generating mechanical fan or propeller mounted within a cylindrical duct or shroud. Other terms include ducted propeller or shrouded propeller . [ 1 ] When used in vertical takeoff and landing ( VTOL ) applications it is also known as a shrouded rotor .