ANSI ASSP Z9.2 pdf free download

ANSI ASSP Z9.2 pdf free download.Fundamentals Governing the Design and Operation of Local Exhaust Ventilation Systems.
2.4 Other Recognized Standards and Guidelines of Good Practice. ASHRAE Handbook Fundamentals. Atlanta, GA: American Society of Heating, Refrigerating and Air Conditioning Engineers ASHRAE Handbook HVAC Applications. Atlanta, GA: American Society of Heating, Refrigerating and Air Conditioning Engineers ASHRAE Guideline 1. The HVAC Commissioning Process; Guideline 4, Preparation of O&M Documentation for Building Systems Heating and Cooling for Man in Industry, American Industrial Hygiene Association Industrial Ventilation. A Manual of Recommended Practice for Design and Industrial Ventilation: A Manual of Recommended Practice for Operation and Maintenance (two volumes), Latest Editions. Cincinnati, OH: Committee on Industrial Ventilation of the American Conference of Governmental Industrial Hygienists SMACNA publications: Accepted Industry Practice for Industrial Duct Construction; Rectangular Industrial Duct Construction Standards; Round Industrial Duct Construction Standards; Guide for Steel Stack Cons truction; Testing, Adjusting, and Balancing HVAC Systems SEMI S2-1 01 6b, Environmental, Health, and Safety Guideline for Semiconductor Man ufacturing Equipment SEMI S6-0707E, EHS Guideline for Exhaust Ventilation of Semiconductor Manufacturing Equipment 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 LEV system. 3.2 Aspect Ratio. In rectangular exhaust openings, usually the ratio of the width to length of the hood opening, e.g., in slot or face openings; in ductwork, the ratio of the height to width of the duct cross-sectional dimensions. 3.3 Baffle, also Flange. Partial enclosures in and around emission sources that improve or enhance airflow patterns at the emission source and at the hood. 3.4 Balanced. In LEV, a balanced system is one in which the desired air flowrate is achieved simultaneously in all branches of the system. 3.5 Branch. A duct connecting an exhaust hood to a main or submain. 3.6 Coefficient of Entry, also known as Hood Flow Coefficient. A unitless factor, designated in the literature as Ce, which relates static pressure at a hood to the velocity pressure in the duct serving the hood. The coefficient of entry is usually calculated as (VPave/SPhood)05. 3.7 Commissioning, Commissioning Plan. A process or plan in which a local exhaust ventilation systems 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. 3.8 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. 3.9 Control Velocity. Also, Capture Velocity. The velocity of air at a point in space sufficient to prevent contaminants from escaping from an enclosing hood and/or to draw contaminants and contaminated air into an exhaust hood. 3.10 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. 3.11 Designer. Persons charged with designing an LEV system; may include mechanical engineers, industrial hygienists and others with design education and experience. See 3.10 for a definition of “design”. 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 developed 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.ANSI ASSP Z9.2 pdf free download.