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  2. Duct leakage testing - Wikipedia

    en.wikipedia.org/wiki/Duct_leakage_testing

    As air is delivered into the ductwork, pressure builds and forces air out of all of the openings in the various ductwork connections or through the seams and joints of the furnace or air-conditioner. The tighter the ductwork system (e.g. fewer holes), the less air is needed from the fan to create a change in the ductwork pressure.

  3. Air conditioning - Wikipedia

    en.wikipedia.org/wiki/Air_conditioning

    The Mitsubishi model was the first air conditioner with a cross-flow fan. [64] [65] [66] In 1969, the first mini-split air conditioner was sold in the US. [67] Multi-zone ductless systems were invented by Daikin in 1973, and variable refrigerant flow systems (which can be thought of as larger multi-split systems) were also invented by Daikin in ...

  4. Heating, ventilation, and air conditioning - Wikipedia

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

    HVAC ventilation exhaust for a 12-story building An axial belt-drive exhaust fan serving an underground car park. This exhaust fan's operation is interlocked with the concentration of contaminants emitted by internal combustion engines. Mechanical, or forced, ventilation is provided by an air handler (AHU) and used to control indoor air quality.

  5. The Final Word with Rico Hizon - Wikipedia

    en.wikipedia.org/wiki/The_Final_Word_with_Rico_Hizon

    The Final Word with Rico Hizon (or simply The Final Word) is a Philippine television news broadcasting show broadcast by CNN Philippines.Anchored by Rico Hizon, it aired from April 20, 2020 to January 26, 2024, replacing CNN Philippines Newsroom: Late Night Edition and was replaced by Frontline Tonight on RPTV's late night timeslot..

  6. California's deadly wildfires could come to an end in the coming days when a weekend storm douses historically dry terrain, but the storm will come with the potential for a dif… Fox Weather 7 ...

  7. Typhoon Mawar – latest: Thousands evacuated as ... - AOL

    www.aol.com/typhoon-mawar-latest-updates...

    The Philippines is considered the most exposed country in the world to tropical storms as approximately 20 cyclones enter the Philippine Area of Responsibility (PAR), the area of the ocean the ...

  8. Refrigerant - Wikipedia

    en.wikipedia.org/wiki/Refrigerant

    A DuPont R-134a refrigerant. A refrigerant is a working fluid used in cooling, heating or reverse cooling and heating of air conditioning systems and heat pumps where they undergo a repeated phase transition from a liquid to a gas and back again.

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