Blue

Ordinary blow guns which emit jets of high pressure compressed air have long been notorious in manufacturing and safety circles for their capacity to cause death or serious injury either through misuse by so-called “practical jokers” or mischance, e.g. the air jet entering someone’s skin as it passes over a small cut or graze. Also, if such a gun is operated close to skin I understand that the jet has sufficient energy/force to penetrate intact skin. Irrespective of how it enters someone's body, high pressure air can cause horrific and excruciating injuries which are difficult to treat. People who survive such injuries can be left with serious permanent damage. Therefore, HSE inspectors who see ordinary blow guns during their visits should give strongly advice that they be replaced by safety-type blow guns which, as you say, emit high volumes of air at low pressure. It was certainly standard advice during my time with HSE. Please can any forum users confirm if this remains so nowadays or has even been stepped up with enforcement action?

See the information on the following websites fleetingly picked from the internet even though they might not comprise the sort of documents you had in mind:

http://www.usmra.com/rep...?category=compressed+air

http://www.dailymail.co....erous-foolish-prank.html