ANSI ASSP Z9.6 pdf free download

ANSI ASSP Z9.6 pdf free download.Exhaust Systems for Grinding, Polishing and Buffing.
3. DEFINITIONS The following definitions explain terms used in this standard. 3.1 Air Cleaning Equipment. A device or combination of devices for separating contaminants from the air handled by an exhaust ventilation system. 3.2 Balanced. In local exhaust systems, a balanced system is one in which the desired air flowrate is achieved simultaneously in all branches of the system. 3.3 Branch Duct. A duct connecting an exhaust hood to a main or submain duct. 3.4 Commissioning, Commissioning Plan. A process or plan in which an exhaust ventilation system’s performance is identified, verified and documented before, during and after design， construction or remodeling to assure proper operation and compliance with codes, standards and user intentions. 3.5 Contaminant. Also, Air Contaminant, Stressor. A substance (smoke, dust, fume, mist, vapor or gas) whose presence in air is harmful, hazardous or a nuisance to humans.3.6 Control Velocity. Also, Capture Velocity. The velocity of air at a point in space sufficient to draw contaminants and contaminated air into an exhaust hood. 3.7 Cradle. A movable fixture, upon which the part to be ground or polished is supported. 3.8 Cut-off Wheels. Wheels of metal or organic bonded abrasives used for sawing and cutting. 3.9 Design. The process that includes characterizing the interactions between emissions, workers and the air; determining appropriate air flowrates, static pressures and other operational parameters; specifying equipment and system components. 3.10 Designer. Persons charged with designing a ventilation system. 3.11 Disc Wheel. All power-driven, rotating discs faced with abrasive materials, artificial or natural, and used for grinding or polishing on the side of the assembled disc. 3.12 Document; to Document; Documentation. The formal process of planning and recording of the rationale for decisions made by the user, the designer or others. Also, the written procedures devel- oped for operating, testing and maintaining an LEV system. 3.13 Ductwork. Elongated rigid or flexible enclosures used to convey air and entrained contaminants from one location to another. 3.14 Entry. The point at which a segment of ductwork (i.e.， branch or submain) enters another segment of ductwork (i.e., submain or main); entry from a hood to a duct; and entry from a plenum to a duct.3.15 Exhaust Hood. Also, Hood. A shaped opening designed to capture or control air contaminants. 3.16 Exhaust Rate. Also, Exhaust Volume Flowrate, Air Flowrate, Q. The air volume flowrate through an exhaust hood or in a duct. Usually in cubic feet per minute (cfm) or cubic meters per second (cms). 3.17 Exhaust System, Local Exhaust System, LEV System. A mechanical system for removing contaminated air from a space, comprised of one or more of the following elements: exhaust hood, ductwork, air cleaning equipment, exhauster or fan, and stack. 3.18 Face Velocity. Average velocity of the air in the plane of a hood opening with a directional vector perpendicular to that plane. 3.19 Fan. Also, Exhauster, Ejector. Mechanical device used to provide pressure and move air through an LEV system.3.20 Grinding, Polishing or Buffing. The removal of material from, or the finishing or polishing of, a workpiece or part using an abrasive tool. 3.21 Grinding Wheel. All power-driven, rotating, grinding or abrasive wheels except disc wheels as defined in this standard consisting of abrasive particles held together by artificial or natural bonds and used for peripheral grinding. 3.22 Hazardous Materials. As defined in OSHA 29 CFR 1910.1200， Appendix A, Hazard Communication. 3.23 Hood. See Exhaust Hood.ANSI ASSP Z9.6 pdf free download.