Local Ventilation Solution for Large, Warm Emission Sources

Ilpo Kulmala, Pasi Hynynen, Irma Welling, Arto Säämänen

Research output: Contribution to journalReview Articlepeer-review

27 Citations (Scopus)


In a foundry casting line, contaminants are released from a large area. Casting fumes include both volatile and particulate compounds. The volatile fraction contains hydrocarbons, whereas the particulate fraction mostly comprises a mixture of vaporized metal fumes. Casting fumes lower the air quality in foundries. The design of local ventilation for the casting area is a challenging task, because of the large casting area and convection plumes from warm moulds. A local ventilation solution for the mould casting area was designed and dimensioned with the aid of computational fluid dynamic (CFD) calculations. According to the calculations, the most efficient solution was a push–pull ventilation system. The prototype of the push–pull system was built and tested in actual operation at the foundry. The push flow was generated by a free plane jet that blew across the 10 m wide casting area towards an exhaust hood on the opposite side of the casting lines. The capture efficiency of the prototype was determined by the tracer gas method. The measured capture efficiencies with push jet varied between 40 and 80%, depending on the distance between the source and the exhaust. With the aid of the push flow, the average capture efficiency was increased from 40 (without jet) to 60%.
Original languageEnglish
Pages (from-to)35 - 43
Number of pages9
JournalAnnals of Work Exposures and Health
Issue number1
Publication statusPublished - 2007
MoE publication typeA2 Review article in a scientific journal


  • Local ventilation, push pull hood, foundry, modelling


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