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Message: <blockquote data-quote="IgnoreMe" data-source="post: 3683307" data-attributes="member: 551352">yup. using a 1" radius flare results in about a 50% reduction in vent velocity. psp ports use about a 1" flare IIRC.dont get me wrong though. round ports are more efficient than slots, because there are no corners, and the there is minimal contact between the air and the perimeter of the port. think about a 4x4" port and a 2x8". both add up to 16^2" of port, however one has 16" of contact with the air (4x4 port) and the other has 20" of perimeter thats in contact with the port air.rounds ports and slots aren't exactly equal, but they also dont compare to the efficiency of a flared aero port either.</blockquote>

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