How does a downdraft table work?

A downdraft table works by creating a flow of air that pulls particles, fumes, and other airborne contaminants downwards, directly away from the work area and the person using the table. Here’s a step-by-step breakdown of how it operates:

• Perforated Work Surface: The top of a downdraft table typically features a perforated or grated surface. This design allows for air to be uniformly pulled through the entire surface area of the table.
• Extraction System/Blower: Beneath the work surface, the table is equipped with a built-in extraction system, which creates a downward airflow.
• Capture of Contaminants: As the worker performs tasks like sanding, grinding, cutting, or welding on the table’s surface, the airborne contaminants produced are immediately drawn downwards by the airflow.
• Filtration System: Below the work surface and integrated into the downdraft table is a filter or series of filters. As the air carrying the contaminants is drawn down, these filters trap and capture the contaminants, preventing them from reentering the workspace or being released outside.
• Collection or Disposal: Some downdraft tables may have collection trays or bins to gather heavier particles, such as sawdust or metal shavings. Periodic emptying and cleaning of these trays or bins are necessary.
• Recirculation or Exhaust: After filtration, the cleaned air can either be recirculated back into the room or, in cases where there are harmful fumes, vented outside.
• Maintenance: For the table to remain effective, regular maintenance is essential. This includes cleaning or replacing filters, emptying collection bins, cleaning the grates on the work surface, and checking the motor/blower for proper functioning.