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Cabin air filter replacement 2009 rx350

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Hi, does the white or charcoal side go facing up when installing a new cabin air filter for my 09 rx350? Took the old one out without looking, not realizing my new one, aftermarket, doesn't have any arrows. 


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It looks like the carbon side is facing up because otherwise (I would think) the top would be white. My filter is made by Wix or other NAPA brand, so there is no dark side.

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