Friday, October 16, 2009

The 35 Terms You Must Know in Ductless Fume Hoods Industries

In Ductless Fume Hoods industries, or generally in fume hoods industries, there are many terms and technical words. It is hard for you to understand about ductless fume hoods if you do not understand the terms. To ease you, below is glossary of some common terms practically used in ductless fume hoods industries.

1. Air Foil: Shaped or streamlined member at ductless fume hoods entrance. It function is to enhance air flow into the ductless fume hoods.

2. Air Volume: Rate of airflow of ductless fume hoods that calculatted in cubic
feet per minute (CFM)

3. ASHRAE: American Society of Heating, Refrigerating,and Air Conditioning Engineers, a professional organization. They are authorized organization to sets industry standards for fume hoods testing procedures

4. Auxiliary Air: To supply external air delivered to the chamber of a fume hood to reduce air consumption

5. Baffle: A panel to control the air pattern that flowing through the ductless fume hoods. It is installed across back of hood interior.

6. Blower: A fan that installed in the ductless fume hoods as a device to blow the air consisting of impeller, scroll and motor.

7. Bypass: Compensating opening that helps maintain constant volume exhaust from fume hood, regardless of sash position

8. Canopy Hood: Ceiling-suspended ventilating device for noncritical use with heat, water vapor, odors, etc.

9. CFM: Cubic Feet Per Minute, the rate to measure of air volume processed by ductless fume hoods

10. Combination Sash: Horizontal panels in a vertically rising frame, installed in the ductless fume hoods face that provides access to the hood interior

11. Constant Volume: Type of fume hood exhaust system that
exhausts the same volume of air, regardless of sash position

12. Containment: Extent to which fumes are confined within
the ductless fume hoods compartment

13. Damper: As a device to control air volume in the duct

14. Demonstration Hood: Fume hood with glass panels on two or three sides to improve visibility for demonstrating experiments in a classroom setting

15. Exhaust Volume/Parameters: Volume of air exhausted by the fume hood; quantity of air required to maintain desired face velocity,calculated in cubic feet per minute (CFM)

16. Face Velocity: Speed of air flowing into the ductless fume hood
through the sash (the opening) that measured in feet per minute (FPM)

17. FPM: Feet per minute to measure the air velocity

18. Liner: The interior sides, back, and top, including baffle of fume hoods

19. HEPA : HEPA stand for High Efficiency Particulate Air to retain particles of filters of ductless fume hoods.

20. Lintel: Portion of fume hood front located above access opening

21. Louvers: Slit-like openings in the lintel that allow bypass
air to enter the hood when the sash is closed

22. NFPA: Stand for National Fire Protection Association

23. Negative Pressure: The situation where by the pressures lower than one atmosphere

24. Positive Pressure: The situation where by the pressures higher than one atmosphere

25. Restricted Bypass Fume Hood: Fume hood operating type, designed with limited bypass area; commonly used in conjunction with Variable Air Volume (VAV) exhaust
systems and restricted sash opening designs

26. Sash: Sliding glass panel set in the fume hood face that
provides access to the hood interior

27. Service Fitting/Plumbing: Water faucets and gas valves
mounted on or fastened to the fume hood

28. Static Pressure: Air pressure, or resistance, in fume hood
or duct, expressed in inches of water

29. U.L. 1805: Underwriters Laboratories certification that
verifies conformance to electrical, mechanical, and
airflow standards

30. PAO : Poly Alpha Olefin a tester to rate the ability of HEPA filters in ductless fume hoods

31. Variable Air Volume (VAV): Type of fume hood exhaust
system that typically maintains constant fume hood face
velocity by adjusting blower motor speed or a balance
damper in response to changes in sash position

32. Velocity: Speed of air, measured in feet per minute (FPM)

33. Velocity Pressure: Force per square inch applied by
moving air

34. Volume: Quantity of air, usually measured in cubic feet
per minute (CFM)

35. Work Surface: Top material; area in fume hood where
apparatus rests and where work takes place

By knowing the common terms of ductless fume hoods as above, it will make you easier to understand about ductless fume hoods.

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