Industrial facilities typically rely on two main types of ventilation systems to control airborne contaminants: 
Source Capture and Ambient Air Cleaning. Both methods are effective for removing dust, smoke, and fumes, but the right choice depends on your specific work environment.
 
Source Capture (Local Exhaust):
This system removes contaminants directly at the point of generation. It can be configured in two ways:
 
Ducted Systems – Use devices such as capture arms, downdraft tables, enclosures, or hoods to pull contaminants into a central dust, fume, or mist collector through ductwork.
 
Self-Contained Units – Portable solutions like mobile fume extractors, portable downdraft tables, welding booths, or wall-mounted collectors that filter and recirculate air without requiring ductwork.
Lower equipment and installation costs (no ductwork required)
Protects workers’ breathing zones (often eliminates the need for respirators)
 
Minimal maintenance (no ducts to clean or relocate)
Flexible and portable for changing workspaces
Reduced energy costs (run only when needed)
No need for costly air makeup systems
 
Ambient Air Cleaning (Dilution or General Ventilation):
This system continuously cycles and filters the air throughout a facility, reducing the overall concentration of airborne contaminants. Air cleaners are strategically placed to maintain airflow and prevent stagnant, polluted air.
 
Advantages of Ambient Air Cleaning systems:
Effective in areas where source capture isn’t possible (e.g., overhead cranes, large parts, limited floor space)
No need for workers to stay near the air cleaner
No repositioning of hoods or arms required
Wall-mounted or ceiling-hung options save valuable floor space
 
Which is best?
Whenever possible, source capture systems are the most effective solution, since they stop contaminants before they reach the worker’s breathing zone. However, ambient air cleaning systems are ideal in facilities where source capture cannot be implemented due to space or operational limitations.