Down draft tables for air cleaning come in a variety of configurations. All are equipped with blowers to draw the air down through the table surface. This air then flows through a filter to trap particles down to 1 to 5 micron size range. 

Some models use cartridge filters or tube filters, other models use water as the trapping medium. The water is required for work with certain metals, such as aluminum for NFPA (National Fire Protection Assoc) fire protection requirements.

Many of the table models come with back and side panels (mostly removable). This is primarily for welding and metal grinding applications.

Table tops are wood, or wood composites, perforated metal, metal grating or fiberglass. Most manufacturers have rubber or plastic matting for the metal surfaces as an option.