Distance between the helmet and the head of the wearer

What is the distance between the helmet and the head of the wearer supposed to be?

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15 Sep '19, 14:29

Sept. 15, 2019, 2:29 p.m.
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Answer:

The minimum distance is required to be 3 cm.

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15 Sep '19, 14:30

Sept. 15, 2019, 2:30 p.m.
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