Notes concerning “Air quality”
House scrubber
2016-09-06 (updated 2018-05-05) (12 minutes)
Spark particulate sieve
2016-10-06 (updated 2016-10-11) (6 minutes)
Notes on a possible household air filter
2018-05-05 (updated 2018-05-15) (10 minutes)
Scrubber mask
2019-05-08 (5 minutes)