If you're in need of a powerful air ventilator, the Miniveyor Air VAF-300 portable ventilators are built to provide maximum power where it is needed and is the ideal confined space exhaust fan for welding fume removal, concrete cutting or demolition. It is also a great blower during remediation work following flooding to dry out buildings. The VAF-300 vane axial fan is the professional choice for construction site work and is available in either 110V or 230V. It works on positive and negative airflow and is at home either extracting dust and fumes or blowing clean air into a workspace.