It can be difficult to tell when to replace a HEPA filter. Should one go by looks? Probably not. Going by looks turns out to be a poor measure of filter efficiency. The best way to test a HEPA filter’s efficiency and determine when to replace it is to use …
One of the biggest questions when I started doing the DIY was HEPA lifespan–how long do the HEPAs last? Rather than just give people a nice-sounding answer, I wanted to see what the data says, so Gus has been dutifully turning on his Original DIY every day in his 12.3m2 Beijing …
After launching the world’s most cost-effective purifier (the Sqair), we started testing the HEPA lifespan. I’ve long been skeptical of the lifespan numbers purifier companies give because (1) they provide no empirical justification for the number and (2) they give the same numbers in Switzerland or Delhi. Yet clearly the …
Ever since we launched the Blast and Blast Mini industrial air purifiers in 2017, we’ve wanted to get good data on how long hepa filters last. These filters are huge, 10-20 times the size of our DIY purifier filters in fact. We’d expect the HEPA lifespan to be much longer, but let’s …
How long do Smart Air HEPAs last? My quest to give a solid empirical answer has now completed 130 days! Gus is still dutifully tracking the effectiveness of the HEPA he’s been using in his bedroom since January (with a trip to the US in the middle), calculating the percent …
passport4adragon 提问: Hi, I’m in Shanghai and recently put together your DIY purifier and bought the same fan and filter you suggested – I think it’s working! A couple of questions – I bought the exact same filter you did on Taobao – how often should it be replaced if …
