Z9.5 - Laboratory Ventilation. The system should include feedback devices that monitor system performance, e.g., static pressure taps, particulate counters, amperage monitors. Hoods must meet the design criteria in the ACGIH Industrial Ventilation Manual or applicable OSHA standards. American Conference of Governmental Industrial Hygienists (ACGIH). When installing stacks: Exhaust ventilation systems require the replacement of exhausted air. Methods of Testing Air-Cleaning Devices Used in General Ventilation for Removing Particulate Matter, Installation of Blower and Exhaust Systems for Dust, Stock, Vapor Removal or Conveying (1983), Fundamentals Governing the Design and Operation of Local Exhaust Systems, Practices for Ventilation and Operation of Open-Surface Tanks, Safety Code for Design, Construction, and Ventilation of Spray Finishing Operations (reaffirmed 1971), Ventilation and Safe Practices of Abrasives Blasting Operations, Laboratory Methods of Testing Fans for Rating, Methods of Testing Dynamic Characteristics of Propeller Fans--Aerodynamically Excited Fan Vibrations and Critical Speeds, Laboratory Methods of Testing Fans for Rating Purposes, Designation for Rotation and Discharge of Centrifugal Fans, Motor Positions for Belt or Chain Drive Centrifugal Fans, Drive Arrangement for Tubular Centrifugal Fans, Guide for Steel Stack Design and Construction (1983), Vapor Removal from Cooking Equipment (1984), Parking Structures (1979); Repair Garages (1979), Ventilation for Acceptable Indoor Air Quality, American Conference of Governmental Industrial Hygienists. The ACGIH has published widely used guidelines for industrial ventilation. A well-designed system and a continuing preventive maintenance program are key elements in the prevention and control of ventilation system problems. Cincinnati: NIOSH. What is to be included and why? Air Movement and Control Association (AMCA). Mark ambiguous phrases, "legalese," and repetition. 0000003949 00000 n
(The degree of hazard is related to toxicity, dose rate, and individual susceptibility); Emission sources are primarily vapors or gases, or small, respirable-size aerosols (those not likely to settle); Heat is to be removed from the space by flushing it with outside air; Concentrations of vapors are to be reduced in an enclosure; and. be exhausted outside the building and not recirculated. Register today to reserve a seat for the November course! Glossary Oil Well Derrick Stability: Guywire Anchor Systems, Industrial Robots and Robot System Safety, Excavations: Hazard Recognition in Trenching and Shoring, Controlling Lead Exposures in the Construction Industry: Engineering and Work Practice Controls, Appendix III:3-3. 0000085366 00000 n
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System effect loss is significant if any elbows are connected to the fan at inlet or outlet. Sheet Metal and Air Conditioning Contractors National Association (SMACNA). To add the following enhancements to your purchase, choose a different seller. Figure III:3-4. Are variable-flow devices like dampers, variable-frequency drives, or inlet vanes in use? The conditioning of air for humans has become normal and expected. Local exhaust ventilation is designed to capture an emitted contaminant at or near its source, before the contaminant has a chance to disperse into the workplace air. If the tapping produces a "clean" sheet metal sound, the duct is clear. OSHA's compliance policy regarding violation of ventilation standards is set forth in the Field Inspection Reference Manual. 0000007233 00000 n
For more information, visit the ACGIH website at acgih.org or call our Customer Service Representatives at 513-742-2020. Please try again later. There was a problem adding this item to Cart. Do plans and specifications adhere to appropriate codes, standards, requirements,policies, and do they recommend good practice as established by the industry? The system should have fail-safe features, e.g., warning devices on critical parts, back-up systems. The drawings come in several views: plan (top), elevation (side and front), isometric, or section. We dont share your credit card details with third-party sellers, and we dont sell your information to others. 0000004981 00000 n
The system should never allow recirculation to significantly increase existing exposures. Hood static pressures (SPH) should be measured about 4-6 duct diameters downstream in a straight section of the hood take-off duct. AMCA Publication One. A minimal fee is often required. In addition, many OSHA health standards include ventilation requirements. The approximate relationship of capture velocity (Vc) to duct velocity (Vd) for a simple plain or narrow flanged hood is illustrated in Figure III:3-4. Guidance for Indoor Air Quality Investigations. Plugged ducts occur when transport velocity is inadequate or when vapor condenses in the duct, wets particles, and causes a build-up of materials. Individual units may be installed in the space they serve, or central units can serve multiple areas. Understand the scope of the project. Please try again. Make-up air can also be provided through dedicated replacement air systems. Most hood design recommendations account for cross-drafts that interfere with hood operation. type and concentration of contaminants in the air (because this affects the fan type and materials of construction); and. You must have JavaScript enabled to enjoy a limited number of articles over the next 30 days. distribution ducts, boxes, plenums, and registers. This list includes some, but not necessarily all, OSHA standards that do not contain airflow requirements but are located in the health-related ventilation standards. pattern of emission (continuous or intermittent), Supply and return flow conditions, to include pressure differences between space and surrounding areas, Sources of tempered and untempered make-up air, thermal (thermal and swinging vane instruments measure static pressure indirectly), other: rags, flashlight, mirror, tachometer. NFPA has produced a number of recommendations (which become requirements when adopted by local fire agencies), e.g., NFPA 45 lists a number of ventilation requirements for laboratory fume hood use. Figure III:3-2. 1987. Plant and Process Ventilation. Please try again. 0000001191 00000 n
If the duct diameter (D) is 6 inches, then the maximum distance of the emission source from the hood should not exceed 9 in. Fan Engineering. Provide ample stack height (a minimum of 10 ft above adjacent rooflines or air intakes); Provide a stack velocity of a minimum of 1.4 times the wind velocity; Place the stack as far from the intake as possible (50 ft is recommended); Place the stack at least 10 ft high on most roofs to avoid recirculation; and. Enhancements you chose aren't available for this seller. Hood entry loss (He) is calculated according to the following equation: A hood's ability to convert static pressure to velocity pressure is given by the coefficient of entry (Ce), as follows: To minimize air-flow requirements, the operation should be enclosed as much as possible, either with a ventilated enclosure, side baffles, or curtains. Figure III:3-5. The hood converts duct static pressure to velocity pressure and hood entry losses (e.g., slot and duct entry losses). To choose the proper fan for a ventilation system, this information must be known: Once this information is available, the type of fan best suited for the system can be chosen. OSHA and Consensus Standards A quick way to check for settled material in a duct is to take a broomstick and tap the underside of all horizontal ducts. Will the designer be able to design, or the contractor to build, the system from the plans and specifications? We work hard to protect your security and privacy. 0000032966 00000 n
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Grinding, polishing, and buffing operations, Ventilation for general welding and cutting--General, Fluorine compounds--Maximum allowable concentration, Ventilation and protection in welding, cutting and h eating--Gal welding, cutting, and heating, Ventilation and protection in welding, cutting, and heating--General welding, cutting, and heating, Abrasive blasting--Personal protective equipment, Abrasive blasting--Air supply and air compressors, Abrasive blasting--Operational procedures and general safety, Open surface tanks--Special precautions for cyanide, Open surface tanks--Inspection, installation and maintenance, Open surface tanks--Vapor degreasing tanks, Hydrogen--Gaseous hydrogen systems--Separate buildings, Hydrogen--Gaseous hydrogen systems--Special rooms, Hydrogen--Liquid hydrogen systems--Separate buildings, Hydrogen--Liquid hydrogen systems--Special rooms, Flammable and combustible liquids--Container and portable tank storage--Design and construction of inside storage room--Ventilation, Flammable and combustible liquids--Industrial plants--Unit physical operations--Ventilation, Flammable and combustible liquids--Bulk plants--Building--Ventilation, Flammable and combustible liquids--Processing plants--Processing building--Ventilation, Spray finishing using flammable and combustible materials--Spray booths--Dry type overspray collectors, Spray finishing using flammable and combustible materials--Ventilation--Conformance--General, Spray finishing using flammable and combustible materials--Electrostatic hand spraying equipment--Ventilation, Dip tanks containing flammable combustible liquids--Ventilation--Ventilation combined with drying, Precautions before entering--Flammable atmospheres and residues, Cleaning and other cold work (flammable vapors), Painting--Paints and tanks coatings dissolved in highly volatile, toxic and/or flammable solvents, Compressed Air--Ventilation and air quality--(Tunnels), Welding, cutting and brazing--Health protection and ventilating--Ventilation for general welding and cutting--General, Welding, cutting and brazing--Health protection and ventilating--Ventilation in confined spaces, Welding, cutting and brazing--Fluorine compounds, Welding, cutting and brazing--Zinc--Confined spaces, Welding, cutting and brazing--Lead--Confined spaces, Ventilation and protection in welding, cutting and heating--Welding, cutting and heating in confined spaces, Ventilation and protection in welding, cutting and heating--Welding, cutting or heating of metals of toxic significance, Tunnels and shafts--Air quality and ventilation, Precautions before entering--Toxic atmospheres and residues, Precautions before entering--Oxygen deficient atmospheres, Mechanical paint removers--Power tools--(paint dust), Ventilation and protection in welding, cutting and heating--Welding, cutting and heating confined spaces. 0000006420 00000 n
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