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Local Exhaust Ventilation

Local Exhaust Ventilation. Topics. How to Catch the Dust. Contaminant Characteristics. Enclosing Hoods. Used for extracting fast moving contaminant Normally smaller with high air velocity Positioned in the direction of contaminant flow Relatively High Pressure. Partial Enclosure.

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Local Exhaust Ventilation

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  1. Local Exhaust Ventilation

  2. Topics

  3. How to Catch the Dust

  4. Contaminant Characteristics

  5. Enclosing Hoods • Used for extracting fast moving contaminant • Normally smaller with high air velocity • Positioned in the direction of contaminant flow • Relatively High Pressure

  6. Partial Enclosure • A combination of an extraction hood and booth • Really useful for light dusts that spread quickly once airborne • Typically used for sack tipping and batch weighing • Allows the contaminant to be collected without removing the product

  7. Down Draft • Simple operation • Multiple applications. Can be used for dust and fume • Good operator protection • Requires high air volume • Ineffective in the application is not carried out on a bench

  8. Canopy Extraction • Predominately used for fume or mist extraction • Requires fumes to rise • Requires larger air volumes • Does not offer local operator protection

  9. Positional Hoods • Excellent for small localised extraction requirements • Can be used for fumes and dust • Flexible operation • Only works if the operator engages with the system • Small sphere of operation • Relatively low air volume

  10. General Extraction • Used to clear fumes from a large space • Can be adapted to extract from light or heavy fume • Best used in a “push / pull” configuration • Creates a dilution effect • Does not offer local operator protection

  11. Fans • Centrifugal Fans • Higher pressure • Fume or dust extraction • Efficient • Axial Fans • Fume extraction and ventilation • High volumes at low pressure • Often poorly applied

  12. Filters • Reverse Pulse Filters • Cartridge suitable for high air volumes and low dust loadings • Bag Filter suitable for high dust loadings • 24 hour operation • Multi-Pocket Filters • Low to medium air volumes can deal with high dust loadings • Must be cleaned every 3 – 4 hours

  13. Filters • Bag House Dust Unit • Predominately for wood waste extraction. Suitable for dust and chippings • Low cost solution • Wet Collectors • Very good for explosive materials • Good solution for heavy dusts • Low efficiency and difficult to servce

  14. Ducting • Spiral Wound • Very cost effective • Simple to install • Can be used on all systems • Difficult to clean • Clip System • Predominantly used for dust extraction • No internal edges, easy to clean • Increased capital cost

  15. Ducting Sizing

  16. Guidlines

  17. ATEX

  18. Additional Equipment

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