120mm HEPA Air Filter for LACK Enclosure

UPDATE 1/29/20: Design update to v2! Thanks to input from members here I reworked the stack so the fan is now in-between the HEPA filter and the carbon chamber. This means the fan is now pushing air through the carbon rather than pulling which should improving airflow. How much improvement? Best I can do is put the v1 and V2 designs on the bench and time how long it takes to fill a garbage bag. v1 took an average of 42s and v2 showed a significant improvement at 31s average fill time. Other improvement is that the carbon chamber can now be pulled off the top making pellets exchanged easier and the fan now lives in the cavity of the lack enclosure so wiring can be internally routed for a cleaner look. Also added a reduced height media chamber for those who want a lower profile look or need less media volume. Please note that one of the corners of each piece in the stack has had the fillet removed to make orientation of parts easier. Three rounded sides and 1 pointy side.