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  2. Air purifier - Wikipedia

    en.wikipedia.org/wiki/Air_purifier

    An air purifier or air cleaner is a device which removes contaminants from the air in a room to improve indoor air quality. These devices are commonly marketed as being beneficial to allergy sufferers and asthmatics , and at reducing or eliminating second-hand tobacco smoke .

  3. Air ioniser - Wikipedia

    en.wikipedia.org/wiki/Air_ioniser

    Air ioniser and purifier with its dust collection plates removed. Air ionisers are used in air purifiers to remove particles from air. [3] Airborne particles become charged as they attract charged ions from the ioniser by electrostatic attraction. The particles in turn are then attracted to any nearby earthed (grounded) conductors, either ...

  4. Office chair - Wikipedia

    en.wikipedia.org/wiki/Office_chair

    An office chair, or desk chair, is a type of chair that is designed for use at a desk in an office. It is usually a swivel chair , with a set of wheels for mobility and adjustable height. Modern office chairs typically use a single, distinctive load bearing leg (often called a gas lift ), which is positioned underneath the chair seat.

  5. Portable air purifier removes harmful microbes from your room

    www.aol.com/lifestyle/portable-air-purifier...

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  6. List of appropriate technology applications - Wikipedia

    en.wikipedia.org/wiki/List_of_appropriate...

    Natural ventilation can be created by providing vents in the upper level of a building to allow warm air to rise by convection and escape to the outside, while cooler air is drawn in through vents at the lower level. Electrical powered fans (e.g., ceiling fans) allow efficient cooling, at a far lower electricity consumption as airconditioning ...

  7. Portable water purification - Wikipedia

    en.wikipedia.org/wiki/Portable_water_purification

    The Portable Aqua Unit for Lifesaving (short PAUL) is a portable ultrafiltration-based membrane water filter for humanitarian aid. It allows the decentralized supply of clean water in emergency and disaster situations for about 400 persons per unit per day. The filter is designed to function with neither chemicals nor energy nor trained personnel.