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An air and light unit, also known as a breathing support unit or mobile air unit, is a specialized firefighting apparatus used by first responders to provide supplemental lighting and self-contained breathing apparatus cylinders and cylinder filling services at the scene of an emergency. [1]
Breathing air compressors must be carefully designed and placed so that the compressor's intake is located in fresh air well away and upstream from any engine exhaust. [5] [6] Lubricating-oil vapour – Oil, which must be used to lubricate the compressor's internal parts, can be harmful if it contaminates the breathing gas and is inhaled as a mist.
Paul Hashagan also notes that, in 1863, A. Lacour developed and patented the "improved breathing apparatus". This system provided air to the wearer from two canvas and rubber balloon-like bags which were carried on the wearer's back. A pair of bellows would then allow the wearer to pump air to a mouthpiece.
In open circuit free-flow systems, the air is supplied at an approximately constant rate, and the diver uses only a relatively small part of the passing gas. The original Aqua-Lung regulator was a single stage unit, packaged in a circular brass housing mounted on the cylinder valve behind the diver's neck.
Aqualung Group (formerly Aqua Lung International, and prior to that La Spirotechnique) [1] is a manufacturer of self-contained breathing apparatus and other diving equipment. It produced the Aqua-Lung line of regulators, including the CG45 (1945) and the Mistral (1955). From its founding in 1946 until 2016, the company was a division of Air ...
Surface-supplied mixed gas diving, using helium based, nitrox, or trimix breathing gases. Usually using lightweight demand helmets, sometimes with helium reclaim systems. Airline or Hookah diving. "Compressor diving" - a rudimentary form of surface-supplied diving used in the Philippines by artisanal fishermen. Recreational forms like snuba.
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