What is Industrial Ventilation?

Industrial ventilation is an integrated system for extracting contaminated air and introducing fresh air into industrial facilities, aiming to protect workers and equipment and improve production quality.


Industrial ventilation system in a factory (Source: iStock)

Types of Industrial Ventilation Systems

1. General Ventilation

Works to dilute contaminants throughout the entire space using supply and exhaust fans.

2. Local Exhaust Ventilation (LEV)

Captures contaminants directly at their source via exhaust hoods and air ducts.

3. Mechanical Ventilation

Relies on fans and motors to forcefully move air, used in enclosed spaces.

4. Natural Ventilation

Relies on building openings and differences in temperature and pressure.

International Standards for Industrial Ventilation

  • ASHRAE Standard 62.1: For ventilation and indoor air quality in buildings.
  • OSHA Regulations: Occupational safety standards in workplaces.
  • NFPA 91: For exhaust systems for air conveying combustible materials.
  • SMACNA Standards: For the fabrication and installation of metal air ducts.
  • ISO 16890: For classification of air filters.

How to Design an Industrial Ventilation System?

  1. Identify contaminants: Dust, fumes, chemical vapors, excessive heat, humidity.
  2. Measure required airflow rate: Based on air changes per hour (ACH).
  3. Design exhaust hoods: Must completely cover the contaminant source.
  4. Calculate duct diameter and air velocity: To prevent contaminant settling.
  5. Select the appropriate fan: Based on required pressure and flow rate.
  6. Install air cleaning system: Filters, scrubbers, gas washers.

Recommended ACH Values for Industrial Ventilation

Facility Type Air Changes per Hour (ACH)
Chemical plants 10-20
Industrial workshops 8-15
Industrial kitchens 15-30
Warehouses 4-8
Spray painting booths 20-40

Common Mistakes in Industrial Ventilation Design

  • ❌ Neglecting heat load and humidity calculations.
  • ❌ Designing exhaust hoods far from the contaminant source.
  • ❌ Using inappropriate duct diameters (excessive pressure or weak extraction).
  • ❌ Neglecting calibration of flow control devices.
  • ❌ Lack of a periodic maintenance system for filters and fans.
💡 Engineering Tip: In facilities handling hazardous materials, a Local Exhaust Ventilation (LEV) system with HEPA filters (99.97% efficiency) must be used.