3 ms·

You don't need fresh on all the time, but for long trips I will switch to fresh for at least five minutes each hour. You just want to cycle the air in the cabin

by brixon 7y ago

You don't need fresh on all the time, but for long trips I will switch to fresh for at least five minutes each hour. You just want to cycle the air in the cabin for less re-breathed air.

JohnJamesRambo 7y ago
My tests with my meter don't imply that is correct. Almost immediately on recirculate the PPM goes up and stays there.
- graeme 7y ago
  This is almost certainly correct. An unventilated space as small as a car will increase within 30-60 seconds, based on my testing of small indoor rooms.
  - jtms 7y ago
    Wow I wonder if anyone has done a study on any correlation between cabin CO2 levels and driver safety?