Welding, Grinding, and Deburring. By combining downdraft ventilation with backdraft suction, and enclosing the workspaces top, back and sides with steel walls, the result is a booth-style workstation capable of containing your toughest pollutants. This 2 x 4 DD-2X4 DowndraftBackdraft Booth is setup for Welding, Grinding, and. Grinding Stone Y100