In 2003 Voortman Staalbouw moved to a new workshop of
140 m long x 22 m wide. During the design stage they took
purchasing a welding fume filtration system into consideration.
In view of the stringent environmental legislation and to meet
the TLV values for welding fumes, Voortman strongly focused on
proper and effective removal of welding fumes.
Pollution in the workshop is not only caused by welding fumes,
but also by dust emission from cutting torches, grinding, drilling
and sawing. Voortman’s annual welding consumption is approx.
45 tons of massive wire. Fork-lift trucks also contribute to the
level of pollution. Hot welding fumes rise to approx. 4-6 m high,
where it forms a layer. This layer gets thicker during the day. At
night, when the air gets colder, the layer of welding fumes come
down. The roof fans that were installed in the old facility were
not capable to remove all the welding fumes properly anymore.
Due to the large sizes of the work pieces (up to 30 metres) and
very frequent changes of the welding activities, source extraction
was not possible, which they already knew from the past.
Because of this, a general filtration system appeared to be the
In this case, the workshop (140 x 22 m) was divided into four
sections. Every section is equipped with a parallel shaped pushpull
system, consisting of two SCS filters and two SIF-1200 each.
The filter units and fans have been integrated in the pillars at the
long sides of the workshop.
The installation height of the system is 5 m. The rising welding
fumes are captured by the horizontal flow of the push-pull
system and blown to the inlet grids. After filtering, the air is
blown back into the workshop by the push grids. A number of 6
air changes per hour guarantee a continuous removal of the
welding fumes and other particulates. Large workpieces are
moved in and out regularly through automatic doors, which
ensures sufficient supplement of fresh air.