Feb 14
Plymovent Fume Extraction System

Guide to Fume Extraction Systems

Ensuring your workshop or facility has proper fume ventilation can be a daunting process. This guide to fume extraction systems will help you understand more about regulatory requirements, benefits of fume extraction, types of fume ventilation systems, and some important considerations when selecting a fume extraction system.

If you have any questions about fume ventilation and extraction or how we can help you, contact us today.

Local Exhaust Ventilation

Local exhaust systems remove toxic pollutants before they can mix with a worker’s breathing zone.

Examples of Local Exhaust Ventilation include:


Downdraft Table

Downdraft tables are simple and effective source-capture fume extraction systems. Fumes are drawn down and back through a grid into exhaust ducting, preventing them from rising and mixing into the worker’s breathing zone. Downdraft tables are suitable for smaller workpieces.


Portable High Vacuum (PHV)

Portable high vacuum (PHV) systems are optimal for small weld and fabrication shops, maintenance facilities, and schools. Portable fume extractors are ideal solutions for confined spaces such as ship hulls and tanks, difficult-to-reach locations, or for occasional welding and fabrication projects. Portable welding fume extraction units are recommended for areas that are not accessible to stationary or larger mobile units. These units have a high degree of flexibility as they can be wall-mounted or used as a mobile unit on wheels.


Mobile fume extractors

Mobile systems are designed to be wheeled around facilities as needed to sources of pollution without a fixed location. Mobile fume extraction units can come in light, medium, or heavy-duty variants. Medium and heavy-duty mobile systems are available with disposable filters or self-cleaning filters.


Stationary fume extractors

Stationary systems save on valuable floor space by being attached to the walls of a facility. Stationary fume extraction units can come in light or heavy-duty variants. Heavy-duty mobile systems are available with disposable filters or self-cleaning filters.



Types of Fume Extraction Ventilation Systems


Diluter Systems

Source extraction and extraction hoods may not always be an option. For these circumstances, Plymovent offers the Diluter systems. These are stand-alone, freestanding solutions to reduce and control the background concentration of welding fumes in your workshop or facility

Extraction Hoods

In some cases, isolating a welding or cutting workspace is preferred. Extraction hoods, such as the Plymovent FlexHood are modular extraction hoods and ideal for these scenarios. Extraction hoods are especially preferred and suitable for robotic welding applications.


Multiple Arm Systems

Larger facilities with a row of welding booths can still benefit from source extraction. A multiple arm system allows for individual positioning where needed. When outfitted with automatic control systems, they also reduce energy consumption providing a faster recovery of investment.

One of the most important things to keep in mind is local, regional, or national regulations. Regulatory bodies will often provide guidance, exposure limits, and training. Failing to meet your local regulations can be costly for businesses as you may face fines or lawsuits in the long term. Additionally, short-term costs may arise from lost productivity as workers face illnesses such as metal fume fever.

Below, you’ll find a list of some resources to help you learn more.



Benefits

There are numerous benefits to invest in a fume extraction system.

Productivity

Proper fume extraction can help reduce employee sicknesses such as metal fume fever. Demonstrating a commitment to employee health and well-being will also help attract and retain a highly-skilled workforce.

Keeping your facility free of contaminated air and dust particles decreases maintenance downtime and reduces the risk of fires or explosions.

Legality

Strict rules and regulations exist to protect employees and ensure a safe working environment. A well-designed fume extraction system installed in your facility can help ensure you meet these requirements and regulations.



Fume Extraction System Considerations

Now you know some of the regulations and benefits of proper fume ventilation and want to purchase a fume extraction system. Where do you start? How do you start?

An excellent starting point is understanding your facility and needs.

  • How big is the workshop or facility?
  • How much welding is done?
  • How many welders are there?
  • Is there a robotic welder?
  • Does metalwork occur in specific, pre-defined locations?
  • How much floor and wall space is there?


How to Choose a Fume Extraction System

You know that it’s important to capture toxic particulate from weld fumes before you can breathe it in. But what if you or your welders are moving around and a stationary unit doesn’t have the reach or coverage for your work?

Portable and mobile fume extractors are an excellent solution when factory space is limited, budgets are limited or welding tasks don’t require large fume extraction units.

Larger facilities with heavy welding operations might require a more in-depth solution. Extraction hoods could be used for areas where regular welding occurs. If a duct system is not available, other systems might be used such as a diluter system.

Below, you’ll find some additional considerations when choosing a fume extraction system.


Filter

  • The filter is one of the most important factors to consider when buying a fume extraction system.
  • Choose a fume extraction system and filter that is specific to your need. Many filters are not designed to collect the carcinogenic particles found in welding fumes.
  • The size of hexavalent chromium particles from welding is typically between 0.05 to 2.0 microns.
  • When working with stainless steel, a high-efficiency filter is recommended. High-efficiency filters can be found in the MFD or MFS mobile fume extractor, the SFD or SFS mobile fume extractor.
  • A combination of filters may be used to improve air quality. The MobilePro is a welding fume extraction system available with HEPA after filters.
  • HEPA filters are the gold standard when it comes to air filtration and can capture up to 99.995% of particles.

Airflow

All fume extraction systems are rated based on the amount of cubic feet of air they circulate each minute (CFM). There are multiple factors which may affect an extractor’s CFM, even when brand new. For optimal results, consult a fume extraction system manufacturer to determine the best extraction system for your needs.


Disposable or Self-Cleaning Fume Extractors

Fume extraction systems are either disposable or self-cleaning units. Disposable units use filters that are discarded as they reach capacity. A self-cleaning filter may be used multiple times, since particles may be cleaned from the filter’s surface.

Each of these units has its benefits. Mobile and stationary extractors can come in both disposable and self-cleaning models.

  • Disposable models have lower initial costs but will require regularly replacing filters.
  • Self-cleaning models have higher initial costs but will provide cost savings as their filters are reusable.

Flexibility

In some shops, flexibility is required and welders would benefit from a variety of units that are capable of adapting to the rapidly changing nature of their work.

Fixed systems might not be useful in smaller shops where welding operations move around regularly. Similarly, a heavy-duty system might not be useful for a shop where there are only occasional welding activities.


User Experience

An often overlooked aspect in selecting a fume extraction system is the ancillary quality of life improvements. For example, ensuring the user interface is easily understandable will help to keep operations flowing smoothly. The accessibility of components and duration required for filter replacement and cleaning are all important considerations as well.

Contact us for a consultation to find out how we can help with your fume extraction ventilation needs, keep you and your workers healthy, your equipment running more efficiently, reduce downtime and boost profits.