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Esco Micro Pte Ltd • 21 Changi South Street 1, Singapore 486777 • Tel: +65 6542 0833 • Fax: +65 6542 6920

Fume Hood Containment & Safety Performance. Esco Micro Pte Ltd • 21 Changi South Street 1, Singapore 486777 • Tel: +65 6542 0833 • Fax: +65 6542 6920. Standard Fume Hood. Why we use fume hood?. To contain fumes and hazardous chemicals Ensure Safety of laboratory workers.

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Esco Micro Pte Ltd • 21 Changi South Street 1, Singapore 486777 • Tel: +65 6542 0833 • Fax: +65 6542 6920

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  1. Fume Hood Containment • & • Safety Performance Esco Micro Pte Ltd • 21 Changi South Street 1, Singapore 486777 • Tel: +65 6542 0833 • Fax: +65 6542 6920

  2. Standard Fume Hood

  3. Why we use fume hood? • To contain fumes and hazardous chemicals • Ensure Safety of laboratory workers

  4. Face Velocity vs Containment Efficiency • Fume hood meets face velocity specification but are not safe. • 30-50% of fume hoods meeting face velocity requirements fail tracer gas test. (source: www.safelab.com)

  5. Existing Standards • BS 7258 (United Kingdom, Hong Kong) • DIN 12 924 (Germany) • EN 14175 (European Union) • ANSI/ASHRAE 110-1995 (United States) • NF-X-15-203 (France) • AS/NZS 8:2006(Australia & New Zealand)

  6. EN 14175 : 2003 European StandardEN 14175 : 2003

  7. EN 14175 : 2003 • Group Effort of 11 European Countries • Combination of BS and DIN standards • 6 parts:- Part 1: Vocabulary- Part 2: Safety and performance requirements- Part 3: Type test methods- Part 4: On-site test methods- Part 5: Recommendations for installation and maintenance - Part 6: Variable air volume fume cupboards

  8. EN 14175 : 2003 Air Flow Test Probe positions

  9. EN 14175 : 2003 Inner Containment Test

  10. EN 14175 : 2003 Inner Containment Test

  11. EN 14175 : 2003 Inner Containment Test

  12. EN 14175 : 2003 Outer Containment Test

  13. EN 14175 : 2003 Outer Containment Test

  14. Robustness of Containment EN 14175 : 2003 • Dynamic Testing: 'Robustness' of Containment Test • Test equipment as per outer containment test equipment • Flat rectangular plate of 1.9 x 0.4m of thickness 20mm shall be mounted in front of cupboard.

  15. EN 14175 : 2003 Robustness Test of Containment

  16. ANSI/ASHRAE 110-1995 US StandardANSI/ASHRAE 110-1995

  17. Introduction ANSI/ASHRAE 110-1995 • Method of Testing Performance of Laboratory Fume Hoods. • ASHRAE: American Heating, Refrigerating and Air-Conditioning Engineers, Incorporation. • “Laboratory Fume Hoods, a Performance Test”, K.J. Caplan and G.W. Kruston, RP-70, ASHRAE Transactions, 1978. • First ASHRAE Standard is published on 1985.

  18. Test Method ANSI/ASHRAE 110-1995 • Cross draft & face velocity test • Smoke visualization test • Tracer gas containment test

  19. ANSI/ASHRAE 110-1995 Cross Draft & Face Velocity • Cross draft transducer • Accuracy: ± 3% of reading • Face velocity transducer • Accuracy: ± 2% of reading

  20. ANSI/ASHRAE 110-1995 Cross draft measurement • Cross draft shall be less than 0.15m/s H ½ H 5 feet

  21. ANSI/ASHRAE 110-1995 Face velocity measurement • 100% sash opening • Face velocity shall be 0.50m/s ± 20% x y ≤300mm ≤300mm

  22. ANSI/ASHRAE 110-1995 x • 50% Sash opening • 25% Sash opening 1/2y ≤300mm x 1/4y ≤300mm

  23. ANSI/ASHRAE 110-1995 Flow visualization • Enable visual inspection of fume hood air flow patterns. • Consist 2 parts: • Low volume smoke test • High volume smoke challenge

  24. ANSI/ASHRAE 110-1995 Low Volume Smoke Test

  25. ANSI/ASHRAE 110-1995 High Volume Smoke Challenge

  26. ANSI/ASHRAE 110-1995 Tracer Gas Containment Test

  27. ANSI/ASHRAE 110-1995 • SF6 Gas • Much heavier than air • Non-flammable, non-toxic • Tracer gas detector • To detect and capture leakage of SF6 from hood. • Detection limit: 0.01 PPM

  28. Mannequin ANSI/ASHRAE 110-1995 • Mannequin height 1.70m, wearing laboratory cloth. • Tracer gas detector placed near the mannequin's breathing zone.

  29. ANSI/ASHRAE 110-1995 Static test • Tracer gas ejector is placed at 150mm behind the sash. • Mannequin placed 75mm in front of sash. • Mannequin position will change according to the ejector location. • SF6 gas release rate is 4LPM. • Data acquisition to record detector reading for 5 mins.

  30. ANSI/ASHRAE 110-1995 Static test • Test is conducted at 100%, 50% and 25% sash opening. • Every test is carried out with ejector in 3 positions: • Center • 300mm from the left • 300mm from the right • Spillage shall not exceed 0.1ppm, in all test positions.

  31. ANSI/ASHRAE 110-1995 Face Hood Surface Scan • To observe leakage point of the hood opening. • Tracer gas probe is held 1 inch away from the edge of sash opening, and move along the edge with a speed of 3 inch per second. • Spillage shall not exceed 0.1ppm, in all test positions.

  32. ANSI/ASHRAE 110-1995 Sash Movement Effect • To test the effect on containment when opening or closing the sash. • Sash is moved at a smooth motion between 0.3 – 0.5m/s. • Sash movement: Closed → Full opening → Closed, repeat 3 times. • Conducted with ejector Located in 3 positions: • Center • 300mm from the left • 300mm From the right

  33. Increased Severity Challenges ESCO Fume Hood • Face velocity in 0.50m/s, 0.40m/s, 0.30m/s to test the hood performance. • FFU to create cross draft.

  34. ESCO Fume Hood Increased Severity Challenges • Moving vertical board to pretend door open or close.

  35. ESCO Fume Hood ASHRAE Test Result for EFD-4 • Face velocity: • Sash 100% open: 0.50 m/s • Sash 50% open: 0.83 m/s • Sash 25% open: 1.15m/s • Smoke visualization:

  36. ESCO Fume Hood ASHRAE Test Result for EFD-4 • Static test

  37. ESCO Fume Hood ASHRAE Test Result for EFD-4 • Face hood surface scan • Sash movement effect

  38. Safety Essentials SafetyEssential

  39. Safety Essentials Fume Hood Location

  40. Safety Essentials Fume Hood Location

  41. Safety Essentials Work Safety • Fume hood is not a storage! • Always keep fume hood clean and clear. • Action must be taken immediately if spillage happen.

  42. Safety Essentials Work Safety • Raise bulky equipment 1-2 inch off the work surface. • Place bulky equipment towards the rear of hood and away from the side walls.

  43. Safety Essentials Work Safety • Keep sash as low as possible when conducting experiment. • Do not block the airfoil. • Reduce pedestrian traffic in front of the hood • Minimize rapid movement in front of hood. • Always keep laboratory windows and doors closed.

  44. Safety Essentials Work Safety • Do not use a hood for any function for which it was not intended. • Certain chemicals or reactions require specially constructed hoods. • Perchloric acid hoods shall be made of stainless steel and equipped with a wash down system. • Polycarbonate sash shall be applied when using hydrofluoric acid. • Work involving harmful micro-organisms should be done in a biosafety cabinet, rather than a chemical fume hood. • Close the sash when finished hood work or leaving experiments or chemicals unattended.

  45. End Thank you!

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