What is the difference between a backdraft table and a downdraft table?

Backdraft tables and downdraft tables are both designed to capture and extract fumes and particulates produced during welding and similar processes. The primary difference lies in the direction in which they extract those fumes. Backdraft tables pull weld fumes up and away from the source, while downdraft tables pull fumes and dust down through perforations or grates in the work surface. For welding fume extraction, a backdraft table is generally preferred over a downdraft table. This is because weld fumes naturally rise due to the heat involved in the process. Backdraft tables capture these rising fumes more effectively by pulling them horizontally away from the welder. When using downdraft tables, some of the weld fume often escapes upward out of the capture zone, allowing fume to accumulate in the breathing zone and escape the weld booth into the larger facility. Backdraft tables do a better job of keeping weld fume away from the welder’s face for superior welding safety and visibility. Downdraft tables, however, are often preferred for the heavier particulate produced by manual cutting and grinding.