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 ...

All you need is a box fan, good air filters and some duct tape ... The Centers for Disease Control and Prevention says these DIY purifiers can be effective for a temporary solution, especially ...

All you need is a box fan, good air filters and some duct tape ... The Centers for Disease Control and Prevention says these DIY purifiers can be effective for a temporary solution, especially ...