According zone (HSE, 2006). This is sometimes difficult

According to the fact sheet (2013), welding smoke is a mixture of very fine particles (fumes) and gases. Many of the substances in welding smoke, such as chromium, nickel, arsenic, asbestos, manganese, silica, beryllium, cadmium, nitrogen oxides, phosgene, acrolein, fluorine compounds, carbon monoxide, cobalt, copper, lead, ozone, selenium, and zinc, can be extremely toxic. Generally, most of the materials in the welding fume come from the consumable electrode, which is partially volatilized in the welding process; a small fraction of the fume is derived from spattered particles and the molten welding pool (Palmer and Eaton, 2001).Welding generates fume, composed primarily of particles and agglomerates less than 1 ?m in diameter Jenkins, Pierce and Eagar (2005), Chung, Aitken and Bradley (1997), and gases, all of which, if inhaled, can be harmful to health (HSE, 2000). Consequently, fume control is often required to maintain exposures at acceptable levels. Control is best achieved using welding exhaust fan. Ideally welding should take place in a ventilated booth or on a downdraft table in order to capture fume before it enters the welder’s breathing zone HSE, MIG and MAG (2006), HSE, FCA and MCA (2006). However, it is recognised that this is not always practical and so moveable hoods are frequently used to capture welding fume. For these to be effective they have to be positioned close to the fume generation point and need to be repositioned at frequent intervals to ensure that the fume generated is always within the capture zone (HSE, 2006). This is sometimes difficult to achieve and does not always occur due to a variety of technical and human factors. When the fume and gases are not properly controlled at source they can enter the workers breath.Fume extractors may be portable, desktop, or industrial high efficiency seen in  a clean room or laboratory normally used for Local Exhaust Ventilation (LEV) to capture harmful dust, fumes or vapours that if not capture would pose a health hazard to the operators. (BOFA, n.d.)From all these observations of the existence of the problem in Cor Jesu College welding laboratory and with no studies conducted in the locality the researchers decided to study if the use of welding fume extractor is effective way of capturing the smokes in the laboratory.