Air Scrubber Update (it works)

The Air Scrubber is almost done, I am just testing it before it is installed in the "enclosure".  So far it is working great though on my desk.  The blower puts out an impressive volume of air and although I had planned to control it using PWM, it seems to be running just about where I would want it when simply connected to 12V (red is +12V and black is Ground), so I think PWM is not necessary.  Running full open at 12V it only draws 750mA so it could go higher if needed - but that would require PWM control since I don't think it runs at full tilt otherwise (could be wrong but it is rated at 1.8A and it is not pulling close to that).  I filled the carbon filter box with some activated carbon pellets made from coconuts which is the way to go I think.  Some activated carbon comes from bituminous coal, so I thought it best to steer clear of that for this project.  Above the carbon box is a HEPA filter and the airflow goes from fan > carbon > HEPA.  I know this may not be the way many filters work, but I wanted the HEPA to filter any fine particles from the carbon filter before exhausting to the room. 

The black tape is 1mm neoprene gasket tape which I used to help seal between the filter body and the carbon tray, and avoid leaks, which seems to be working well.  I did not detect any leaks around the body of the filter so all the air seems to be moving through the HEPA (and I can feel the airflow though it also). 

The funnel like thing in the 1st pic is an adapter for a CPAP hose, which, when connected still has some mild suction at the end of the hose - though the hose is over a meter long and will be cut down in the final application.  I am still not sure if I will use the hose, but want to try it out as a point filter.  I should have some pics of this installed and set up soon.