Filters extend either inside or outside the enclosure. Hexagon, square, rectangle, and diamond grid patterns are about 85% open. There are a variety of foam media options for use in filtering.

The 3D basket filters extend either inside or outside an enclosure, doubling surface area. Housed in a one-piece fabricated frame, the filters come in hexagon, square, rectangular, and diamond-grid ...

Should you get an air purifier or an air filter machine for your home or office to protect you from the coronavirus? Do they work? How much do they cost? Here’s why these questions came up for The ...