ANSI ASHRAE 110 pdf free download
ANSI ASHRAE 110 pdf free download.Methods of Testing Pert formance of Laboratory Fume Hoods.
air-supply ftvtures: devices or openings through which air flows into the laboratory room. For the purpose of this standard, all accessories, connecting duct adapters, or other mounting aitvays shall be considered part of the supply fixture and reported as a unit or an assembly. Some specific supply fixtures are defined as follows:
diffuser: an outlet designed to mix supply air and room air and to distribute it in varying directions.
grille: a louvered or perforated face over an opening.
perforated ceiling: a ceiling with perforated panels used to distribute the air uniformly throughout the ceiling or a portion of the ceiling. Filter pads may be used to achieve a similar result.
register: a combination grille and damper assembly.
auxiliary air: unconditioned or partially conditioned supply or supplemental air delivered to a laboratory at the laboratory fume hood to reduce room air consumption.
control level: the average measured concentration of tracer gas, in parts of tracer gas per million parts of air by volume (ppm) that is not exceeded at the hood face with a 4.0 Lpm (67 mL!s) release rate.
design opening: the position of the sash at which the design team assumes that the hood will be operating. The design opening is critical fur determining the volumetric flow through the laboratory hood.
face i’elocit’: the average velocity of air moving perpendicular to the hood face, usually expressed in feet per minute (fpm) or meters per second (mis).
fume hood system: an arrangement consisting of a fume hood. its adjacent room environment, and the air exhaust equipment, such as blowers and ductwork, required to make the hood operable.
hoodface: the plane of minimum area at the front portion of a laboratory fume hood through which air enters when the sash is or sashes arc full opened. usually in the same plane as the sash for a hood with a vertical sash. For hoods with horizontal sashes, combination sashes, or multiple vertical sashes, the hood face is the plane corresponding to the surface of the outer-most sash panel.
laboratory hood (‘sonetimes referred to as a fume hood): a box-like structure enclosing a source of potential air contamination. with one open or partially open side, into which air is moved for the purpose of containing and exhausting air contaminants. A laboratory hood is generally used for bench-scale laboratory operations but does not necessarily involve the use of a bench or table. Figure 3.1 shows the major components of a typical laboratory hood. Although the test in this standard is written for a benchtop laboratory hood. other applications are discussed in lnfbrmative Appendix A.
lazy airflow: an airflow problem in a hood that is revealed when the smoke generated in a smoke challenge remains on the work surface without smoothly flowing to the back baffle. Figure 3.2 shows an example of lazy airflow.
maxiniun, opening: the position of the sash at which the hood has the largest opening.
operating opening: the position of the sash at which the hood user places the sash while working at the face of the hood.ANSI ASHRAE 110 pdf download.
