The enclosure is mounted removably on the support, by fitting its lower face, intended to receive the gaseous mixture, onto a bearing piece of the support, and the enclosure is autonomous in terms of energy supply and carries means of storing {HEAD ~ the gases} that are intended to form {TAIL ~ the gaseous mixture} 
are intended to form
The enclosure is mounted removably on the support , by fitting its lower face , intended to receive the gaseous mixture , onto a bearing piece of the support , and the enclosure is autonomous in terms of energy supply and carries means of storing { HEAD ~ the gases } that are intended to form { TAIL ~ the gaseous mixture }
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