DIY cleanroom test: a HEPA purifier pushes a room to just 12 Pa
Initial DIY Cleanroom Experimentation
Jeff Kaufman tried Adin Richards' idea of improvising a positive-pressure bioshelter with household gear. An AirFanta 3Pro HEPA purifier hit 83 Pa into a trash bag, but a room only reached about 12 Pa, and the meter is rated to just 5 Pa. He cut a 13x13" hole in his wall, braced the sideways-mounted unit with baling wire, and ordered an SDP810-500PA sensor to map leaks.
I made a 13x13" hole in my wall, and mounted the AirFanta horizontally. It immediately fell apart, because it uses friction fits that aren't designed for sideways loading.