Process ventilation and industrial dust extraction

Process ventilation differs from general ventilation in that its job is not to remove heat and supply fresh air to people, but to capture contamination at source — dust, fumes, oil mist or volatile organic compounds — before it spreads through the hall. The starting point is always the specific process and what it emits, never an air change rate from a table.

Capture at source instead of dilution

The most common mistake is trying to solve an emission problem with more general supply air. Diluting contamination across the whole hall volume is energy-expensive and barely effective — the average concentration drops, but operator exposure at the workstation stays.

Local exhaust ventilation (LEV) captures contamination where it is generated, using a fraction of the airflow needed for dilution. What matters is hood geometry and a capture velocity matched to the nature of the emission — different for dry dust than for hot fumes rising by convection.

Scope of solutions

• Local exhaust ventilation (LEV) — hoods, extraction arms and enclosures designed for the specific operation.
• Dust extraction systems — cyclones, cartridge and bag filters with cleaning systems, sized to dust type and load.
• Extraction of fumes and VOCs — for coating lines, printing, bonding and processes with organic solvents.
• Oil mist extraction — for machining and forming operations.
• Welding fume extraction — mobile and fixed installations for welding bays.
• Heat recovery — recovering energy from extracted air, essential where extraction runs continuously.

Balance of the whole facility, not a single hood

Extraction removes air that must be replaced. Ignoring this creates underpressure in the hall, draws cold air through gates and gaps, and raises heating costs — often more than the extraction itself. We design the air balance for the entire facility together with the cooling systems and heating, and tie extraction capacity to automation that reduces airflow when some workstations are idle.

Process ventilation in clean zones

Where an emitting process sits next to a controlled zone, extraction must work with the pressure cascade rather than against it. We described such a system for automotive glass screen printing, where VOC extraction operates inside an ISO 7–8 cleanroom.

Frequently asked questions

How does process ventilation differ from general ventilation?

General ventilation exchanges room air for the benefit of people. Process ventilation serves a specific machine or operation and removes contamination at source — it is designed around the emission, not around the room volume.

How is extraction capacity determined?

From the capture velocity required for the type of contamination and the hood geometry. Heavy dust needs considerably more than light fumes. A well-designed hood close to the source achieves the result with a smaller airflow, which lowers both investment and running costs.

Do you handle ATEX zones?

Yes — including explosion-rated equipment and installations for processes with organic vapours and combustible dusts.

Have a process emission problem?

Describe the operation and what it emits — we will propose a capture and filtration concept with an air balance for the facility. Call +48 32 450 56 66 or write to biuro@clima-line.pl.