Homemade air purifiers can filter air faster, making them an affordable alternative to more expensive commercial products.

Smoke particles carried by the wind infiltrate homes, schools, and offices, posing serious health risks. To help solve this, ...

The CR Box comprises four air filters commonly used in heating, ventilation, and air conditioning (HVAC); a cardboard base; and a box fan to draw air through the filters and toward the ceiling.

The CR Box is made up of four air filters commonly used in heating, ventilation, and air conditioning (HVAC); a cardboard base; and a box fan to draw air through the filters and toward the ceiling.

At its core, an air purifier is just a fan that blows air through a filter. In fact, if you’re truly in a pinch, taping five HVAC filters to a box fan (to create what’s known as a “Corsi ...