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0 0 <br /> • When cold surfaces below 20°F are within reach, a warning should be <br /> given to each worker by his supervisor to prevent inadvertent contact by <br /> bare skin. <br /> If the air temperature is 0°F or less, the hands should be protected by <br /> mittens. Machine controls and tools for use in cold conditions should be <br /> designed so that they can be handled without removing the mittens. <br /> o Provisions for additional total body protection is required if work is performed <br /> in an environment at or below 40°F. The workers shall wear cold protective <br /> clothing appropriate for the level of cold and physical activity: <br /> • If the air velocity at the job site is increased by wind, draft, or artificial <br /> ventilating equipment, the cooling effect of the wind shall be reduced by <br /> shielding the work area, or be wearing an easily removable outer <br /> windbreak garment. <br /> • If only light work is involved and if the clothing on the worker may become <br /> wet on the job site, the outer layer of the clothing in use shall be of a type <br /> impermeable to water. The outer garments must include provisions for <br /> easy ventilation in order to prevent wetting of inner layers by sweat. If work <br /> • is done at normal temperatures or in a hot environment before entering the <br /> cold area, the employee shall make sure that his clothing is not wet as a <br /> consequence of sweating. If his clothing is wet, the employee shall change <br /> into dry clothes before entering the cold area. The workers shall change <br /> socks and any removable felt insoles at regular daily intervals or use vapor <br /> barrier boots. The optimal frequency of change shall be determined <br /> empirically and will vary individually and according to the type of shoe worn <br /> and how much the individual's feet sweat. <br /> • If extremities, ears, toes, and nose, cannot be protected sufficiently to <br /> prevent sensation of excessive cold or frostbite by handwear, footwear, <br /> and face masks, these protective items shall be supplied in auxiliary <br /> heated versions. <br /> • If the available clothing does not give adequate protection to prevent <br /> hypothermia or frostbite, work shall be modified or suspended until <br /> adequate clothing is made available or until weather conditions improve. <br /> • Workers handling evaporative liquid (gasoline, alcohol, or cleaning fluids) <br /> at air temperatures below 40°F shall take special precautions to avoid <br /> soaking of clothing or gloves with the liquids because of the added danger <br /> of cold injury due to evaporative cooling. Special note should be taken of <br /> . the particularly acute effects of splashes of "cryogenic fluids" or those <br /> liquids with a boiling point just above ambient temperatures. <br /> 4 <br />