[chewz]

This seems like useless toy.

You should be aiming for something larger that would work for an apartment.

[1] https://youtu.be/kH5APw_SLUU

[2] https://youtu.be/8Hkdpx-59kk

There is thousand vidoes on Youtube on how to DYI one.

[dredmorbius]

The problem for areas presently affected by high PM2.5 concentrations, most notably Australia, is that materials which are commonplace in the US, box fans, but especially box-fan-sized square HEPA furnace filters, are rare as hen's teeth.

So alternate designs using available materials are required.

(Or someone might drop ship a few containers worth of box fans and HEPA furnace filters down under.)

[brnt]

Same problem here. I've just spent close to an hour trying to locate a box fan for sale in Europe, couldn't find any resembling those I can easily find on amazon.com!

[yboris]

Thank you for sharing these two videos! I really like the 1st one with the air-quality-measuring-instrument.

[chewz]

You welcome.

You can also make DYI air-quality instrument on a cheap using SDS011 sensor and Raspberry Pi. [2]

[1] https://aqicn.org/sensor/sds011/

[2] https://www.raspberrypi.org/blog/monitor-air-quality-with-a-...