Design goal -> battery powered air filter sufficiently portable to be carried to school camp and used in a room of 3-8 students overnight at a noise level that will not disturb others.
With half the filter surface area & fewer fans of those tested by @robwiss from @cleanairkits (https://twitter.com/robwiss/status/1586152589246496768?s=20) the estimated CADR for 6 Arctic P14s fans running on 12V and two 12x13x1 Filtrete 1900 is around 140cfm, 235m3/hr or 66L/s.
Running quieter on 9V for less CADR is an option.
#IAQ #CleanAir
@cleanairstars What adapters are you using to connect the fans? (Just a note, but something like this could also allow phone/laptop battery to power at 9V):
USB to 9v, 5v to 12v Step Up, DROK USB Cable DC 5V Boost to 9V 12V Voltage Converter 1A Step-up Volt Transformer Power Regulator Line with LED Display https://a.co/d/cQCHq1N
@cleanairstars How did you chain the 6 fans to adapter?
@WilliamRamsey they are PST fans. Cables hidden in the recesses. To say it was finicky is an understatement.
@WilliamRamsey to swap between high and medium flow rates you simply use either the 12V or 9V cable from the same output, no step up required as the battery pack delivers 12V.
@cleanairstars So does each fan connect to a splitter cable(s) before adapting to barrel plug/usb? I've seen splitters/hubs up to 5.
@WilliamRamsey connect the first fan to the 4 pin adapter and then the rest of the PST fans in series
@WilliamRamsey just need to make sure the power supply has sufficient Amperage to supply the number of fans
@cleanairstars Ah! I wasn't aware those fans had ithe extra terminal.
@WilliamRamsey only the PST version of the fan
@cleanairstars Comparing specs with standard P14, looks like they share same static pressure, rpm, cfm. PWM control is added benefit too. Cost difference is about price of splitter cable (for 5-pack).
@cleanairstars Thanks for info. (I ordered a pack for brother to play with.) If you come across an adapter from fan to barrel plug that can attach to housing like this, let me know!
@WilliamRamsey do you mean 5.5x2.1mm DC Male Plug to 4Pin Male PC Fan Power Supply Adapter?
@cleanairstars it would be a threaded female plug/terminal (to attach to unit housing).
@WilliamRamsey can only find 5.5x2.1mm DC Female Plug to 4Pin Male PC Fan unfortunately
@WilliamRamsey
12V to 4 pin https://amzn.asia/d/5sibWza
USB-C to 12V https://core-electronics.com.au/usb-type-c-31-pd-to-55mm-barrel-jack-cable-12v-5a-output-12m-long-with-e-mark.html
USB-C to 9V https://core-electronics.com.au/usb-type-c-31-pd-to-55mm-barrel-jack-cable-9v-5a-output-12m-long-with-e-mark.html
30000mAh battery pack with 13V and 9V outputs https://amzn.asia/d/h5Y1pgE