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Message: [QUOTE="TARM, post: 85653, member: 578"] IMO they are only for looks or maybe at times where you are gonna be in a super dusty area where you also do not need max air flow. Consider the total surface area of all those pleats in a filters media. Now compare that to just a single flat surface of a cover. It cuts the surface or area where air can flow thru by at least 75% 3x's less area. That is area that will clog that much faster and flow that much less. If its so porous to not effect air flow then its doing little to help filter anything but the largest particles and would still tend to clog much faster. Again they are mainly for looks and IMO hurt air flow significantly. Its actually rather amusing to see all the fighting trying to get a filter that flows the best. Fighting for the smallest increases over another filter in flow only to turn around and throw a cover over it. LOL But it does allow companies to get a bunch of free advertising. Some even charge more for allowing you the chance to advertise for them for free. They actually charge more for covers with their name and logo on it compared to blank. Now that's is amusing. [/QUOTE]

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