LEVS FOR WELDING FUME

The files offered here are provided to demonstrate that effective capture of welding fume is achievable with correct used of Local Exhaust Ventilation (LEV). Note that hexavalent chromium (Cr6+) concentrations within the welding helmet are reduced from over 650 µg/m3 to less than 2.5 µg/m3.

The data presented here are intended to be indicative of possible results that can be achieved in ordinary welding operations using portable or fixed filtration LEVs with equivalent:

• Fan horsepower,
• Blower installation,
• Filtration sealing within the lEV,
• Duct diameter,
• Hood configuration, and
• Duct diameter and length.

These data are NOT, however, definitive. The fume capture results that can be expected in a specific workplace are affected by number of factors including (but not limited to) the following:

• Air movement created by comfort fans,
• Drafts from nearby open doors, and
• Configuration of the component(s) being welded.

It has been H&H's experience that LEVs for welding fume provide the most reliable capture per unit distance from the arc when the intake hood is placed ON THE PART being welded.

These data are not to be construed as a substitute for the Employee Monitoring. Employers remain responsible for performing that monitoring.

Video Clip + PDF Files

• Videoclip showing air cleaning during welding
  WMV (Windows Media Video)
• M66V with Upgraded Seal - 25 June 2011 Report (PDF)
• Condensed Sample Results - 25 June 2011 (PDF)
• Final Report from Chemtex P11070014 (PDF)