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SOURCE CAPTURE
National Air Filtration Association. Spring Technical Training.
Dallas TX. April 22/2005.
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• Why ?
• How ?
• Where ?
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Why Source Capture
• NIOSH: • OHSA: • AMERICAN STANDARDS INSTITUTE • AWS F3.2M/F3.2.2001 June 15, 2001. • CANADIAN STANDARDS INSTITUTE • W117.2.01
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• Source Capture:
• Localized • Most Efficient • Economical • Removes the contaminant from the
BREATHING ZONE.
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TRADITIONAL VENTILATION
• Most economical ventilation method
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• An improvement with the aid of installing local exhaust fans and using natural cross flow ventilation.
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How Can we Improve?
• Point of Use Capture
• Localized Exhaust
• Remove the contaminant
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• Remove the contaminant from the Breathing Zone.
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Point of Use Capture
• Point of use capture relies on the use of a capture :
• Hood • Nozzle • Encapsulation.
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Typical Exhaust to Atmosphere
• Localized source capture hood.
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Return Clean Air to Environment
• Various methods can be used either
• STATIONARY • MOBILE.
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• Fume hoods may be used for small batch type application
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Downdraft Table
• Sometimes it is more practical to draw the contaminant down and away .
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Capture Hoods
• Typically used in many applications.
• Not efficient.
• Does not remove contaminant from breathing zone.
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APPLICATIONS
• Welding Fumes • Grinding Dust • Oil Mist Removal • Dry Dust Removal • Gaseous Contaminant • Other ?
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Health Compliance
Efficiency Economy
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Filtration Efficiency
• “Capture efficiency” generally has greater influence on air quality than filter efficiency.
• Filter efficiency required must be sufficient to meet all national and local codes and standards.
• Toxic Materials : 99.97% (HEPA) • Most Applications 99.9%. On 0.5 microns.
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Confined Spaces.
• Adequate ventilation to reduce levels of air contaminants.
• Gases. • Vapours. • Dusts. • Fumes.
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Ventilation Guides.
• Local Exhaust . Provided by fans and exhaust hoods that capture airborne contaminants at the source.
• Local exhaust is preferred over dilution general ventilation.
• Local exhaust usually comprised of Hood, Fan, Duct and Air Cleaner.
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P.R.P
• Personal Respiratory Protection. • Only Approved Equipment. • Used in absence of adequate Local Exhaust • Confined Spaces which cannot be
adequately ventilated. • Exhaust hood cannot be located close
enough to ensure capture. • Exhaust hood not practical.
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Exposure Limits
• Ministry of Labour • Authority Having Jurisdiction • OEL. Expressed : PPM- Mg/m3
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Examples
• “Stainless Steel” • Chromium = 0.01Mg/m3 • Nickel = 0.2 Mg/m3 • “Aluminum” • Manganese = 0.2 Mg/m3 • Ozone = 0.05ppm- Heavy • 0.08ppm- Moderate • 0.10ppm- Light • 0.20ppm- Less than 2hrs.
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Solutions for Dust, Fume and Odor control in Hi-Tech manufacturing, medical and laboratory applications
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Solutions for Automotive service and repair
Spring Exhaust Hose Reel for controlling toxic vehicle exhaust fumes at Ferrari Service Center in Malmö, Sweden
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Solutions for Vehicle Exhaust emmissions testing
Looped Rail Exhaust system serving 70,000 NYC Taxi’s each year at the NYC Taxi & Limosine vehicle inspection facility
Large Fleet Operations
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Use of the products will clean the air from any airborne gases and particles like...
•Soldering fumes
•Grinding dust
•Chemical dust and fumes
•Welding fumes
•Oilmist
•Metal cutting dust & fumes
•Rescue vehicle exhaust gases
•Workshop vehicle exhaust gases
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Solution for Military and Off Road Vehicles
Straight Rail System for controlling diesel exhaust fumes at US Army Tank
Maintenance facility
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Solutions for portable fume and dust control
Multi Fume Caddie and Carry for Maintenance and Service applications
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