Which is why [Adam Kelly] decided to design this DIY HEPA air purifier that ... which would position the fan so it draws air through the center of the filter. In terms of testing, [Adam] wasn ...

Here's a quick guide to getting cleaner air: Filters are key, whether you're using them to upgrade your home's HVAC system or put them in an air purifier or a DIY ... filter to the back of a box ...