1. Take the filter out of the frame.
Release the frame bolt first and take out the filter from the frame.
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2. Change the filter.
First take the used filterout. Then put the new filter into the frame as shownon the photo by pushing it hardand set it for the center hol.
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3. Be careful not to make a gap.
Set the filter tight to the frame. Do not try it a once but put it by step by step carefully. Try not to make any wrinkle.
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4. Finally set the bolt.
Put the filter in the frame tightly and set the bolt firmly. Make sure again there is no gap between the filter and the frame.
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