Which is why [Adam Kelly] decided to design this DIY HEPA air purifier that ... To build his purifier, [Adam] found a HEPA H13 rated replacement filter that was cheap and readily available ...

They also provide tips for making an efficient DIY air filtration unit. Here are the instructions: If you need a visual, here are two videos that may help. How to build a box fan HEPA filter ...

The next filter is an off-the-shelf HEPA filter sealed with a gasket; these are available in a wide variety of sizes and shapes so [Andrew] selected one that was a good fit. The third and final ...

When equipped HEPA filters, the best air purifiers effectively remove particles like dust, pollen, smoke and pet dander from the air, and many come with activated carbon filters to help combat ...

The Centers for Disease Control and Prevention says these DIY purifiers can be ... t have any other alternatives. HEPA (for high-efficiency particulate air) filters are used in many air purifier ...