Nolan N21 Sécurité Et Instructions D'utilisation page 13

- Never use the HELMET LOCK RING to fasten the helmet to the head and/or to
adjust the tension (see instructions above).
- Do not remove the HELMET LOCK RING form the retention system strap.
- In case of malfunctioning or damages, please contact an authorised Nolan
dealer.
FRONT AERATORS
Some versions of this helmet feature front aerators.
These strongly characterize the product and emphasize its vintage inspiration (Fig. 12).
Please note that these aerators - while allowing air to access the helmet inner air
ducts - are more ornamental than functional. They are not therefore designed to offer
the same performance level of more sophisticated ventilation systems in terms of air
capacity or of air and water infiltrations prevention.
13