What is a central filter system?
- Erol Köksoy
- Aug 5
- 3 min read
Updated: Sep 12
These are systems used to filter various fume and dust with a fan + filter group positioned inside or outside the working environment.
What are the types?
Different installations are possible.
Smoke/dust extraction and filtration with multiple extraction arms
Numerous bottom suction table suction
Thermal cutting tables (such as plasma, laser)
Wall-mounted smoke extraction units
Ambient ventilation systems (push-pull, layered ventilation, etc.)
Central high vacuum systems for multiple point suction
In what situations should centralized systems be used?
This depends entirely on user preferences and technical limitations. In an environment with a large number of welders and limited space, mobile units may not be the preferred choice. Of course, this choice requires careful consideration of both investment and operating costs. Centralized systems generally require higher investment costs and extensive piping.
What is a hall ventilation system?
It can be explained as the filtering and recirculation of all fumes and volatile particles generated in the work environment. The biggest problem in welded manufacturing halls is that localized extraction systems are unfortunately ineffective, especially in cases requiring long weld seams. Localized extraction arms cannot capture welding fumes beyond a distance of approximately 30-40 cm. In this case, welding fumes will continue to spread into the hall. Even if welders protect themselves with PPE, other workers cannot avoid exposure to these particles.
Therefore, the use of "ambient ventilation" systems in production areas has become essential. While many different systems can be applied in halls, the most effective system is "displacement ventilation." However, the installation and operating costs of ducted displacement ventilation systems are quite high, and future relocation or upgrades present significant challenges.
There are different varieties available:
1. Push-Pull systems: Ambient air drawn in by a pipeline is filtered and then released back into the environment through a supply pipeline positioned opposite the suction pipeline. This system is not recommended for situations such as high thermal loads (an annual welding wire consumption of more than 10 tons), ceiling heights greater than 8 meters, or pipe spacing greater than 20-25 meters.
2. Layered (displacement) ventilation: Ideal for areas where push-pull systems are not possible. Suction pipes placed in the ceiling carry the contaminated air to the filter unit. The cleaned air is released back into the environment at very low velocities at ground level.
3. Filter tower : In principle, it operates like a layered ventilation system. Its biggest advantage is that it does not require piping. It can be transported within the hall.
Why should I choose ambient ventilation?
Welding fumes, when formed, quickly rise upwards due to high temperatures.
Smoke that loses heat remains suspended between 2.5 and 5 meters.
The smoke, freed from heavy particles, continues its slow upward movement.
The particles that are sprinkled down are lifted up again with every air current in the environment and are inhaled by all employees.
These particles also settle in the eye sockets, skin and hair follicles of workers.
Welding fumes cause very painful diseases and deaths in the long term.
If welding fumes contain carcinogenic substances (e.g., nickel compounds or chromium), the air must be exhausted or filtered and recirculated. (Considering the environmental impact, filtering is the best option.) The placement of particles is determined by their size and weight. Small particles are suspended in the air by the airflow. Very small particles remain suspended in the air, and if not absorbed, they can be inhaled and cause serious health problems, even cancer.
What value should the ambient air have?
Legal limits vary across countries. We base our designs on the German standard of 1.25 mg/m³ and design accordingly.
What is HiS?
R&D studies were carried out entirely within our company.
The system filters all volatile particles formed in production areas to prevent them from being dispersed again and ensures that the ambient air reaches a breathable value.
Each HiS unit has a 1.3 kW EC motor. It features a composite fan that produces a maximum flow rate of 5,000 m³/h. Nanofiber-coated cartridge filters are at least Class F9.
The filter cleaning system is fully automatic. HiS absorbs and filters polluted air, then recirculates a portion of the cleaned air at very low speeds at ground level, thus complying with the displacement ventilation principle.
A portion of the cleaned air is blown towards the other HiS unit via jet nozzles, ensuring continuous movement of volatile particles.
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