| 摘要 |
A protection-hood or helmet-mask having double walls of transparent plastic material, which covers the whole head and by aid of an elastic collar is sealed to the wearer's neck. The space between the walls is divided by a partition wall into two identical halves to which hoses for supply and abduction of air are connected at the lower back of the hood. The air is led to the wearer through an opening in the inner wall at the wearer's mouth and nose. The air can be passed through the hood by overpressure or underpressure arrangements. An air filter is arranged upstream of the air inlet of the hood.
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