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This article will discuss the different types of fumes, including welding fumes and vapors. It will also provide information on fume hoods and laminar flow fume hoods, two commonly used fume exhaust systems. To learn more about fume emissions and vapors, visit our Fumes and Vapors page.


Fumes are particulate air pollutants that cause respiratory problems, heart disease, and cancer. Fumes are formed when solids and liquids are combusted and then released into the air. These particles are often invisible to the naked eye, but they are extremely dangerous to human health. Fumes can be caused by anything from car exhaust fumes to solvent fumes. Thankfully, there are steps you can take to protect yourself.

During welding, metal gouging, and lancing processes, metal fumes are released into the air. These fumes contain fine particles as small as one um in diameter. These fumes can be very dangerous to your health, and if you have to work in an area where you’re exposed to them, you should consider getting a fume filtration system for your workplace.

Welding fumes

Welding fume is a complex mix of airborne particles. Its particle size ranges from 0.56 to 0.1 mm. Most of these particles deposit in the alveolar and bronchiolar areas. These particles can be detected by MOUDI. Several methods are available to collect and analyze welding fume.

Welding fume is toxic to the respiratory system and poses a health risk when inhaled. As such, employers must assess the level of exposure to welding fumes and take appropriate steps to control it. This process is known as risk assessment.

Welding vapors

When metals are welded, welding vapors are released in the air. This mixture of gases is highly toxic and can cause lung and kidney damage. These fumes can also irritate the nose and throat. They can accumulate over time, so it’s important to protect yourself by staying away from welding areas and wearing protective gear.

The maximum welding hazard is caused by electrodes with a basic covering and high amperage. Other types of electrodes produce less dangerous vapors, such as rutile-cellulose or acidic electrodes. However, the biological hazard increases with basic electrodes, due to the emission of toxic gasses. A single electrode can emit as much as 280 m3 of fumes during welding.

Laminar flow fume hoods

Laminar flow fume hoods filter air to maintain a sterile environment. Having a contaminated environment can have negative effects on scientific research and can lead to failed experiments. Additionally, contaminated air can expose researchers to harmful bacteria and germs, which could lead to diseases. By using laminar flow fume hoods, these risks are eliminated. They are a great option for laboratories with sensitive equipment.

Laminar flow fume hoods can be installed on a benchtop or in a larger cabinet. Some models feature a vibration-isolated work surface and bellows compatible shields. This feature is beneficial for microscopy labs, as it reduces the risk of operator fatigue and nausea due to building vibrations. Some models also feature UV germicidal lamps that denature microbial genetic material. Other models are equipped with static-dissipative PVC, which is useful for assembly of static-sensitive electronics.

Ducted fume hoods

Ducted fume hoods are required if your fumes are not contained in other ventilation systems. These hoods are equipped with filters, which are designed to trap the gases. There are various types of filters, and you should choose the right one for your application. You can consult your fume hood provider for information about the chemical filters available. In addition, you should know how often to replace the carbon filter. The amount of chemicals that are used and the temperature they react with can determine the lifespan of a carbon filter.

Ducted fume hoods are ideal for laboratories with high volumes of chemicals and heavy use. But they are not the best solution for every lab. The air filtered by a ducted fume hood is much more efficient than unfiltered air. This feature reduces the amount of air pollutants that are released into the environment.