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      03-05-2013, 01:03 PM   #17
mdosu
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Drives: Double Vanos'd Civic-M3
Join Date: Oct 2009
Location: San Francisco

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Quote:
Originally Posted by Richbot View Post
In theory. In practice the downside is probably reduced filtration of stank, they have carbon in them which has a limited useful life
highly technical.

but Rich is right, if you drive your car in a metro area like DC here, you will notice a difference in cabin air quality. I often find myself stuck behind stinky old cars, country-boy modified diesel trucks, and delivery trucks. I turn the vents to Auto recirculate and it detects the "stank" particles and immediately turns the outside vents off, and allows the filter to do the work.