Non-Vented Hard Hats
In some particularly dirty, cold or wet environments, a non-vented hard hat is often preferred over the vented alternative. This is because the enclosed shell of the helmet helps retain heat and does not have the openings that fine dust, dirt and water spray can get through. Non-vented helmets are often specified for use in areas where live cables are present, as a vented opening can allow bare conductors to contact the wearer's head.
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