Airflow Backflow Preventer Stop Valve
thingiverse
I designed this to prevent damp external air from back-flowing into my printer enclosure when my exhaust fan is idle. The valve opens automatically when the fan starts, and it closes when the fan stops. The valve is very sensitive; it opens wide with my fan set to its slowest speed, and when airflow stops, the valve closes fully against the edge stops. I integrated this valve into my HEPA Air Filter Scrubber Tower (https://www.thingiverse.com/thing:2751455), and it's backward compatible as an add-on with the Air Filter design from https://www.thingiverse.com/thing:2394452. The design mainly consists of a Collar and a Flapper. The outer diameter of the 42mm Collar mates with the interior of the Grommet provided at https://www.thingiverse.com/thing:2394452.
With this file you will be able to print Airflow Backflow Preventer Stop Valve with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on Airflow Backflow Preventer Stop Valve.