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  2. List of cleaning companies - Wikipedia

    en.wikipedia.org/wiki/List_of_cleaning_companies

    ISS A/S – a facility services company founded in Copenhagen, Denmark in 1901. Jani-King – an American chain and franchise of cleaning services. [4] Merry Maids – a residential cleaning service franchisor founded in 1979, acquired by ServiceMaster in 1988, with franchises in the United States, Canada and the United Kingdom. [5]

  3. 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 .

  4. Commercial cleaning - Wikipedia

    en.wikipedia.org/wiki/Commercial_cleaning

    This is an accepted version of this page This is the latest accepted revision, reviewed on 17 January 2025. Cleaning service provided for commercial buildings and establishments "Cleaning company" redirects here. For the Australian documentary film also known as "The Cleaning Company", see Clean (2022 film). This article needs additional citations for verification. Please help improve this ...

  5. Heating, ventilation, and air conditioning - Wikipedia

    en.wikipedia.org/wiki/Heating,_ventilation,_and...

    Clean air delivery rate (CADR) is the amount of clean air an air cleaner provides to a room or space. When determining CADR, the amount of airflow in a space is taken into account. For example, an air cleaner with a flow rate of 30 cubic metres (1,000 cu ft) per minute and an efficiency of 50% has a CADR of 15 cubic metres (500 cu ft) per minute.

  6. Dust collector - Wikipedia

    en.wikipedia.org/wiki/Dust_collector

    A dust collector is a system used to enhance the quality of air released from industrial and commercial processes by collecting dust and other impurities from air or gas. Designed to handle high-volume dust loads, a dust collector system consists of a blower, dust filter, a filter-cleaning system, and a dust receptacle or dust removal system.

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  8. Duct (flow) - Wikipedia

    en.wikipedia.org/wiki/Duct_(flow)

    Downstream of the air handler, the supply air trunk duct will commonly fork, providing air to many individual air outlets such as diffusers, grilles, and registers. When the system is designed with a main duct branching into many subsidiary branch ducts, fittings called take-offs allow a small portion of the flow in the main duct to be diverted ...

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