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Helmet NITRO N1200-VX L
Nitro N1200-VX chin vent
Inside the chin bar are two mesh covered circular openings, located on either side, about equal with the rider's lower jaw, and just in front of the removable cheek pads. These holes appear to act as exhaust vents to allow the air to flow outward, but why this is necessary in this particular location remains a mystery.
The sides of the chin bar have two "shark gill" vents on the outside, backed by the same screen mesh. They're covered by a slightly tinted clear plastic cover that is open at the rear. When looking through the helmet from the inside, I can see the shark gill vents directly through the circular vents inside the chin bar.
Nitro N1200-VX side vents
The bottom line with the chin venting system on the Nitro N1200-VX is that I can't tell where the air flows once it enters, and I'm not sure what purpose is served by the complex system of exhaust vents on either side of the chin bar. The cold temperatures we're experiencing lately make it hard to distinguish where the air is coming from as it flows into the helmet.
Helmet venting is usually more important when the weather turns warm, when it's easier to evaluate the effectiveness of the air flow. I don't really notice a difference whether the chin vent is open or closed on the Nitro.
The helmet has a brow vent, located just above the top of the face shield. A nearly flush, centrally located switch can be pushed back to open and forward to close the vents, which are located on either side of the vent appliqué. This switch is hard to identify at first when wearing thick motorcycle gloves, but once its location is determined after some trial and error, it's fairly easy to slide open or closed.
Top vent on the Nitro N1200-VX
When the switch is pushed towards the rear, two small horizontal bars move back about 45 degrees, allowing air to flow in through the vent. They're open in the photo above. As with the chin vent, it is not obvious to me where the air goes once it enters the brow vent. There are no holes on the inside of the helmet that I can see that would direct the air on to the rider's brow or head from the brow vent.
The Nitro also has a couple of circular mesh covered openings on top of the helmet, situated in one of those aero-type appendages that form a sort of airfoil over the top and back of the helmet. Each channel has its own button, which are labeled "Open" and "Close". The channels appear to allow air in the front and then out the back via another pair of circular mesh covered holes. There are two very small (about 3mm) holes in the top of the helmet inside that channel air up into the top exhausts.
Finally, the back of the helmet features two very small mesh covered exhaust vents that cannot be closed. I can feel a sort of channel along the lower jaw section of the helmet on each side that leads from the circular internal exhaust vents on either side of the chin back to these tiny rear exhaust openings.

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