General Ventilation Systems
General ventilation systems capture residual, warm fumes and gases that are emitted from the process.
The Product: General Ventilation Systems
A main feature of the general ventilation systems captures residual, warm fumes and gases that are emitted from the process and have risen vertically towards the roof, which haven't been caught and directly removed at-source. The general ventilation system continuously removes polluted air that settles just below the roof, roughly two or three metres below. An additional benefit of this system is that it still allows for any vehicles or gantry cranes to operate within the building.
By installing a high-level general fume extraction system not only creates a cleaner, safer work environment for all staff in the business but also provides cost savings; rather than trying to extract the entire volume of the building we target the dirty band of fume that can be visibly seen with multiple extraction points.
What do the HSE State?
In HSE’s WL3: Welding Fume Control guidance, it states that: “Effective general ventilation provides rapid fume clearance as is necessary to minimise the fume build-up from over the shift where welding fume is not fully removed by local exhaust ventilation (LEV). Mechanical general ventilation is typically required because natural ventilation (from through-draughts) is not sufficient enough to disperse the fume generated.”
We Have the Solution for You
Auto Extract Systems can help specify and design the right LEV system for your business's requirements. We only use the highest quality products and installations come complete with a 12-month installation warranty.
We always recommend extraction at-source, find out about out capture philosophy here. However, to provide additional general ventilation, as a secondary measure in workshops, we recommend ‘wrap-around’ general ventilation LEV systems.
These wrap around systems typically consist of two runs of ducting, which stretch the length of a workshop and feature a series of louvred grilles. The grilles capture and remove welding fume plumes that have risen and settled in the hot air just below the roofline. This layer of hot dispersed fumes is typically referred to as the ‘dirty band’. The fan then vents captured welding fumes to the atmosphere in accordance with HSG258 guidelines on ‘Controlling Airborne Contaminants at Work: A Guide to Local Exhaust Ventilation (LEV)’ and conform with HSE inspection standards.
Although, this isn’t a wrap-around general ventilation’s only benefit. After installing a bespoke and innovating ‘wrap-around’ general ventilation system for a Welsh manufacturer, their maintenance manager found the system was a great resource and success in the height of Summer to draw heat (from manufacturing plant and workstations) out of the building when temperatures had exceeded 30oC. Read the full case study here.
A Complete LEV System
General ventilation systems should be utilised in conjunction with one of our centrifugal fans to vent the captured fumes either directly to the atmosphere or depending on the working process, via a filtration unit.
Find Out More
To find out more about general ventilation systems and how we can help you find the right local exhaust ventilation (LEV) system for you and your business, head over to our News section. To arrange a free site assessment, call us on +44 (0)1942 267444 or click the yellow Request Information button above.
To find out more about the latest LEV installations we've been working on, check out our Case Studies section.
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