Last week I conducted several tests with my DIY Air Purifer with a SmartAir HEPA filter and Vietnamese fan. The results of testing two rooms at 40 square meters was good. The next day I tested the same DIY air purifier in the test bedroom roughly 20 square meters. As you can see below, it was another bad air day in Saigon. Start of Test This test only used the Vietnamese … [Read more...] about DIY Vietnamese Air Purifier 6 Hour Test