Sites with masked workers, briefly

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Possible Answers: ORS.

Last seen on: LA Times Crossword 29 Dec 18, Saturday

Random information on the term “ORS”:

Hypoxic air technology for fire prevention, also known as oxygen reduction system, is an active fire protection technique based on a permanent reduction of the oxygen concentration in the protected rooms. Unlike traditional fire suppression systems that usually extinguish fire after it is detected, hypoxic air is able to prevent fire.


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In a volume protected by hypoxic air, a normobaric hypoxic atmosphere is continuously retained: hypoxic means that the partial pressure of the oxygen is lower than at the sea level, normobaric means that the barometric pressure is equal to the barometric pressure at the sea level. Usually 5%/10% of oxygen contained in the air is replaced by the same amount of nitrogen: as a consequence a hypoxic atmosphere containing around 15 Vol% of oxygen and 85 Vol% of nitrogen is created. In a normobaric hypoxic environment, common materials cannot ignite or burn.[1] Thus, considering the fire triangle, a fire cannot occur because of the lack of sufficient oxygen. “However, at 15% oxygen level, risk for fire still exists, and the system cannot be seen as an alternative to extinguishing systems.”.[2]

ORS on Wikipedia