DNA High Performance Filters Hi, working prototype for our final testing Friday 13th of March and the official release Friday 20 or Monday 23.
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I understand what you're saying, but allow me to expound on your example. First clogging of the filter is called "filter loading", as the filter loads up it becomes more restrictive "static resistance". A furnace fan is spinning at a set speed and pulling a specific amperage when the filter is clean. As the filter loads this imposes static resistance on the suction side of the fan decreasing air flow. Since the fan is not moving as much air the motor is actually working less and amperage drops.Air Flow through a Filter naturally becomes reduced as the "pores" in the filter material become "clogged" in the absence of increasing the force pushing/pulling the air through the Filter. Hence, the importance of regularly changing the Filter on a furnace to avoid excessive wear on the fan motor which must work harder as the Filter becomes increasingly contaminated.
Those finger size holes you refer to are there for a very good reason. Resonance.Finally changed the filter to a DNA at almost 2k miles. Taking out the OEM was a surprise. The filter media looks to be synthetic fiber and may have some light oil in it. It appears like the air is entering the filter area on a sharp angle at a high velocity and so deformed the element some.
I aligned the old filter with the box and the new filter inside. You can see from the dirt pattern that where the most flow is the box is covered and the air must come down the air tube and turn the corner. Maybe it wont make a difference? or maybe the velocity helps to whip dirt particles into the media? I don't think that filter box flows very evenly so there may be some performance to be gained in that area with a better air tube/lid . Another surprise was the finger sized holes on the air tube right next to the left fork tube. For maximum ram air it should be sealed.
I can tell the bike runs much better now with the DNA installed.