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  2. Duct leakage testing - Wikipedia

    en.wikipedia.org/wiki/Duct_leakage_testing

    A duct leakage tester is a diagnostic tool designed to measure the airtightness of forced air heating, ventilating and air-conditioning (HVAC) ductwork. A duct leakage tester consists of a calibrated fan for measuring an air flow rate and a pressure sensing device to measure the pressure created by the fan flow.

  3. Liebert Corporation - Wikipedia

    en.wikipedia.org/wiki/Liebert_Corporation

    Founded by Ralph C. Liebert (1918-1984) as Capitol Refrigeration Industries in 1946, Liebert Corporation was formed in 1965 as the industry's first [citation needed] designer and manufacturer of computer room air conditioning (CRAC) systems. Targeted to the mainframe computer data-processing market, Liebert CRAC systems were the first totally ...

  4. Vertiv - Wikipedia

    en.wikipedia.org/wiki/Vertiv

    Vertiv began as Capitol Refrigeration Industries, established in 1946 by Ralph Liebert (1918–1984) in Columbus, Ohio.Liebert developed the first prototype precision air conditioner in his garage.

  5. HVAC control system - Wikipedia

    en.wikipedia.org/wiki/HVAC_control_system

    HVAC (Heating, Ventilation and Air Conditioning) equipment needs a control system to regulate the operation of a heating and/or air conditioning system. [1] Usually a sensing device is used to compare the actual state (e.g. temperature) with a target state. Then the control system draws a conclusion what action has to be taken (e.g. start the ...

  6. Demonic dad allegedly beheads 1-year-old son with knife after ...

    www.aol.com/demonic-dad-allegedly-beheads-1...

    A demonic California dad has been arrested for allegedly beheading his 1-year-old son Friday in an early-morning frenzy of violence that also injured his wife and her mother, according to police.

  7. Air conditioning - Wikipedia

    en.wikipedia.org/wiki/Air_conditioning

    The efficiency of air conditioners is often rated by the seasonal energy efficiency ratio (SEER), which is defined by the Air Conditioning, Heating and Refrigeration Institute in its 2008 standard AHRI 210/240, Performance Rating of Unitary Air-Conditioning and Air-Source Heat Pump Equipment. [61]

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