Crivit SP-803Y - Manual (Page 34)

vENTIlATION SYSTEM
Your motorcycle helmet is fitted with an easy-push
ventilation system in the area of the chin.
To open the ventilation system, please press the
point indicated in the diagram (1).
To reclose the ventilation system, simply press the
button again. You can open the vent on the top of
the helmet by pushing back the cover (2). To close
the ventilation system, push the cover forwards
again.