Say you have dust going in. Then you are caught in a rain storm. Now the dust turn to mud. Dries out and cakes up. You pull the filter, this breaks the adobe hut building after so many weather settings. Count fog if no rain happens. You are still in that wet bubble we exist in.
Even though you think the filter is cushioned or sealed off, as you pull the filter, you are not seeing the ceiling collapse into the post ram from a straight down position to the angle of the filter. It's real subtle an angle, but think, straight down debris drop as you slide the element out of the slot.
KAK, last thing you want to do is bang the filter on the ground to clean it. this will break up what is clinging to the pleats. These micron tumble closer out the other side, kind of inspect and reinstall. If you have the vacuum cleaner handy, then as you clean the ram chambers, suck the filter pleats from the pre-ram side until you get another filter in about another 6K miles from now.
You can Q-tip the channel guides with Vick's vapo-rub type grease. This will help slide the filter in easier if you have a problem.
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