| 摘要 |
A mask or hood worn by a welding or grinder operator includes a manifold extending along the lower perimeter thereof below the chin of the operator. The manifold is provided with a plurality of holes or slots which vent pressurized air downwardly. The downwardly vented air forms an air curtain which prevents entry under the hood of smoke and noxious fumes created by the welding or grinding process. The manifold is supplied by a flexible tube which is connected between one end of the manifold and an air blower which may be secured to the operator's body, preferably at the waist, or which may be located remotely. The body-carried air blower is provided with a rechargeable battery pack.
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