Android java & MCU Keil/uVision, STM32F

DIY: Make Your Own HEPA Air Filtration System for Just $30!

Make a HEPA air filter out of a box fan and HEPA furnace filter.

inhabitat.com

DIY air purifier - Google 검색

2013. 7. 15. · Use string to strap the HEPA filter onto the front of the fan, and you're done! Your very own DIY homemade air purifier. The metal bar in the middle will stick through the filter a little bit. You could saw the metal bar off, but my tests s

www.google.co.kr