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  2. Vent-Axia - Wikipedia

    en.wikipedia.org/wiki/Vent-Axia

    In 1957, the company, along with subsidiary Axia Fans, agreed a 99-year lease on a new 4.5-acre (1.8 ha) site at Manor Royal in Crawley. [5] The company was acquired by the Hall Thermotank Ltd Group and later was sold to Smiths Group in 1992, [6] and became part of Volution Group when it was formed in 2002. [7]

  3. Axial compressor - Wikipedia

    en.wikipedia.org/wiki/Axial_compressor

    The General Electric J79 was the first major example of a variable stator design, and today it is a common feature of most military engines. Closing the variable stators progressively, as compressor speed falls, reduces the slope of the surge (or stall) line on the operating characteristic (or map), improving the surge margin of the installed unit.

  4. Ventilation (architecture) - Wikipedia

    en.wikipedia.org/wiki/Ventilation_(architecture)

    In 1973, in response to the 1973 oil crisis and conservation concerns, ASHRAE Standards 62-73 and 62–81) reduced required ventilation from 10 CFM (4.76 L/s) per person to 5 CFM (2.37 L/s) per person. In cold, warm, humid, or dusty climates, it is preferable to minimize ventilation with outdoor air to conserve energy, cost, or filtration.

  5. Perodua Axia - Wikipedia

    en.wikipedia.org/wiki/Perodua_Axia

    The Perodua Axia is a city car produced by Malaysian automobile manufacturer Perodua.It was launched on 15 September 2014 as the successor to the Viva. [1] The car takes over the title of being the most affordable car in Malaysia from the Viva, and the best-selling car in Malaysia for three consecutive years, between 2015 until 2017. [2]

  6. Modes of mechanical ventilation - Wikipedia

    en.wikipedia.org/wiki/Modes_of_mechanical...

    The method for monitoring whether or not the patient is meeting the required minute ventilation (V E) differs by ventilator brand and model, but, in general, there is a window of monitored time, and a smaller window checked against the larger window (i.e., in the Dräger Evita® line of mechanical ventilators there is a moving 20-second window ...

  7. Bass reflex - Wikipedia

    en.wikipedia.org/wiki/Bass_reflex

    The step response of a standard B4 vented-box low-frequency alignment is depicted in (a), while that of a standard B2 (Q = 0.7071) closed-box low-frequency alignment is depicted in (b). Some electronic keyboards use ported speakers to improve the bass response and sound performance. Pictured here is a Yamaha DGX-202.