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NAFA Guide To Air Filtration

Learn about the importance of clean air in industrial finishing processes. Discover typical booth designs, airflow rates, filtration systems, and disposal requirements. Ensure your facility meets industrial finishing standards.

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NAFA Guide To Air Filtration

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  1. NAFA Guide To Air Filtration Industrial Finishing presented by the National Air Filtration Association Fifth Edition

  2. Typical Automotive Finish Booth

  3. Aviation Finishing

  4. Industrial - Wood Finishing Industrial Products Finishing

  5. Industrial More Than Automotive

  6. Industrial Finishing Requirements • Almost all industrial processes require clean air to protect a product or process of production. • Clean the incoming air required by the product or process • Blanket the product/process with cleaned air • Offer enough air flow exhausted to keep potentially dirty air away from product/process

  7. Booth Airflow Intake Air Exhaust Air Makeup Air

  8. Airflow Rate Through a Booth Airflow through the booth sufficient to remove VOC to levels below 25% of its lower explosive limit Usually 125 to 150 fpm

  9. Open-style Finishing Booth

  10. Booth Types: Crossdraft Intake Filters Exhaust Overspray Filters

  11. Booth Type: Downdraft Ceiling Diffusion Media Exhaust Overspray Filters Filtered Supply Air Heated and Recirculated During Drying Process

  12. Finish Booth Supply Air Filtration Filters incoming air to the booth or diffusion filter

  13. Finish Booth Supply Air Filtration • Designed to provide 99% efficiency on particles > than 5 micron and • Designed to diffuse uniform air flow across the painting • surface.

  14. Finish Booth Exhaust Air Filtration • Typical overspray arrestors are: • Expanded paper-paper & polyester combination • Fiberglass pads -

  15. Convoluted synthetic pads, Synthetic rolls and cube-style filters

  16. Baffle Overspray Filters Baffle-type craftboard cardboard, and styrofoam

  17. Efficiency Minimums For Overspray Filters – 98%

  18. Failure of Exhaust Filters to Capture Overspray Finish Exhaust Stack from Industrial Plant

  19. Finishing Booth Overspray Filter Disposal • Disposal of filters is critical. They may need to be be stored in air tight containers to avoid spontaneous combustion • Some dispensed filters can not be land filled. Some may need to be incinerated. • Certain specialized industrial paint operations may require specialized filtration. For instance Aerospace, Wood Finishing, Automotive OEM and Auto body shop repair.

  20. Sample Questions

  21. Two General Categories of Enclosed Finish Booths Crossdraft Downdraft Open-style booths are not “enclosed”

  22. When Exhaust Air Exceeds Intake Air ___________must be provided to Replace the Difference Makeup Air

  23. Minimum Demonstrated Overspray Filter Efficiency Must Be at Least ______ 98%

  24. Overspray Filters May Be Hazardous as Defined by Federal Regulations if they Exhibit Any of Four Characteristics; Corrosivity Ignitability Reactivity Toxicity

  25. Airflow Through a Booth Must Be… High enough to keep the concentration of VOC vapor held below 25% of its lower explosive limit

  26. Thank you. Questions?

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