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Plymovent stationary filter units can be used for the filtration of welding fumes and dust. The wide range of filter units can be used for only one extraction arm up to central filter systems, used with multiple arm systems, cutting tables or general ventilation and filtration solutions.
Safety alert from HSE: There has been a change in enforcement expectations for mild steel welding fume after new scientific evidence that exposure to mild steel welding fume can cause lung cancer and possibly kidney cancer in humans. As a result HSE has issued a safety alert, click here to read more.
Straight answers to the questions people ask most when choosing and running stationary welding fume filter units.
A stationary filter unit is a fixed fan and filter assembly that draws contaminated air from one or more extraction points, cleans it and either returns it to the workshop or discharges it. Sizes range from small units serving a single arm to central systems serving a whole workshop.They suit permanent welding stations, production lines, cutting tables and general fume and dust control.
Add up the airflow needed at every extraction point that will run at the same time, then allow for duct resistance and some margin. Arm length, hood size, the process and the number of welders all affect the figure.A unit that is too small will not capture fume properly, while one that is too large wastes energy. A system designer or the supplier can work through this with you, so ask our team to help you choose.
Most welding fume units use a filter material, often pleated cartridges, to trap particles. Some are replaced when full, while others clean themselves in place with pulses of compressed air that knock dust into a collector. Other designs charge particles and collect them on plates that must be washed or wiped clean.The right choice depends on the fume, how many hours the unit runs each day and the maintenance you can carry out. Check the data plate and manual of the unit you are considering for the filter type, the cleaning method and the service interval.
A single unit with its own arm is simple and good for one station. Several arms on one unit work if the stations share a space and are not all used at once. A central system with ducting suits many stations and gives one place to maintain the filter.Central systems need more design work and ducting, and their balance matters, but they can be easier to look after in a large workshop.
Often yes, if the filter is rated for the fume and the process does not give off hazardous gases or vapours the filter cannot remove. Returning air saves heating energy and avoids drawing cold air in through the building.Check the manufacturer's guidance and your risk assessment. Stainless steel, coated materials and some consumables need extra care, and some applications require discharge to the outside instead.
Larger units normally need a three-phase supply, while smaller ones may run from single phase. Self-cleaning types need a supply of clean, dry compressed air at a stated pressure, unless the unit has its own compressor.The data plate and manual list the requirements. Electrical connection and air connections should be made by competent people, and the fan rotation should be checked at commissioning.