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After another test fitting following the fan's installation, it was time to test drive my scrubber/filter. I took the bottom screen and fit a stocking over it (which just barely fit) to filter out any fine dust. The excess length of the stocking was simply draped inside the chamber along the frame's edge to be held down when covered by charcoal. I then loaded up the chamber with approx. 4 inches of activated charcoal and closed up the box by securing the unit’s top into place with drywall screws. I powered on the fan and found the noise from its operation a bit loud but nothing else to complain about. I put both of my hands over the input screen and felt a good draft and heard the motor straining under the load caused by my actions. Based on this little test it seemed that the 4 inches of charcoal wasn't too much for the fan so I left it as was.
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