Abstract
A study of the influence of holes in hard hats on the ventilation rate around the head of the wearer was done by measuring the temperature changes which occurred inside of hats provided with holes in the sides or in the crown. Three sets of hats were used in the test, one with no ventilation holes, one with six 1/4-inch diameter holes in the sides and the third with two 1/2-inch diameter holes in the crown. The three subjects either sat quietly or stepped on and off a wooden block 30 cm high at a rate of 12 steps per minute while wearing the hats. The tests were performed in three environments, namely hot dry, cool and hot saturated. Temperatures were measured by means of three thermocouples, one on the inner surface of the hat, another on the scalp of the subject and the third in the air gap between the scalp and the shell of the hat. Ventilation holes in hard hats do not have any significant effect on the temperature of the wearer's scalp, or of the air above his head. Holes in the side of the hat actually produced temperatures higher than those found in hats with no holes in the crown. The ventilation provided by the gap between the inner hat band and the shell of the hat appears to be adequate for the environmental conditions which exist in mines.
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