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The [[ATV 350]] has a good ventilation system, but it is not airtight on its own.  That is where the nitro-cycler comes in.  This modification allows the crew compartment to be airtight, and filters the the air in the cabin to provide a continuous air supply.  The name comes from the fact that the device provides an Earth like environment with 78% nitrogen rather than the [[Reach]] air proportion.  The nitrogen/oxygen ratio provided by the nitro-cycler allows for easier breathing, meaning that drivers can stay alert and active for longer periods of time.  [[Earth Tech]] versions are called scrubbers.