This ventilation is often the best engineering control available to keep chemical exposure below exposure limits. 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. We take all your requirements into account. If an airflow monitor is not installed, test the hood airflow with a piece of light material (such as a tissue or chemwipe) held to the bottom of the sash. For example, inch on the sheet may represent one foot on the ground.) Home; Resources; CAD Drawings; Laboratory Fume Hoods; CAD Drawings. (615) 322-5000, Making Health Care Personal A chemical fume hood can protect lab personnel from inhaling chemical fumes by constantly pulling contaminated air into the hood and exhausting it out of the building. If the tapping produces heavy, thudding sounds and no sheet metal vibration, liquids or settled dust may be in the duct. Certified. Effective Flange Width (W). This list includes some, but not necessarily all, OSHA standards that address the control of employee exposure to recognized contaminants.). Individual units may be installed in the space they serve, or central units can serve multiple areas. Fire and Explosion-Related Ventilation Standards. Flexi Bin 8 inch Bin. This protocol is to be used by Stanford University in-house personnel (e.g., HVAC Shop) and contractors for . The following guidelines should be followed if your alarm activates: If you are having problems with your fume hood, contact EH&S at 206.543.9510. Recirculation should not be used if a carcinogen is present. An isometric drawing is one that illustrates the system in three dimensions. Complete and post thisform when performing fume hood decontamination (UW Form 1803: Notice of Laboratory Equipment Decontamination). This section of the manual addresses ventilation in commercial buildings and industrial facilities. Introduction A properly functioning chemical fume hood is one of the most important pieces of laboratory safety equipment. The required exhaust flow (CFM), static . If possible, elevate equipment and containers two to three inches above the working surface using perforated or slotted shelving to minimize disruption to the airflow. Laboratory Fume Hood is a ventilated enclosure that limit exposure of laboratory technician to hazardous or toxic fumes or vapors. Be certain you are operating the hood at or below the sash arrows. Replacement air is often called make-up air. This SOP describes the processes for commissioning and annual inspection of laboratory fume hoods and is based on testing and specifications found in the ANSI/AIHA Z9.5 and . Vanderbilt, Vanderbilt University Medical Center, V Oak Leaf Design, Monroe Carell Jr. Childrens Hospital at Vanderbilt and Vanderbilt Health are trademarks of The Vanderbilt University. . 4 shows the simplest form of hood and one which will draw best of all, because the hot gases go straight up without making any turns or bends. . Protector Airo Filtered Fume Hood - 4 wide , 37.7 depth. Some systems are designed to provide individual control of rooms in a multiple-zone system. Chemical fume hoods. Before taking velocity or pressure measurements, note and record the operating status of the equipment. 22.7" Interior Height, Domestic Electrical Requirements, No Clear Back & Baffle, 2' Nominal Width, 22.7" Interior Height, Domestic Electrical Requirements, No Clear Back & Baffle, 3' Nominal Width. 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. Hot-wire anemometers should not be used in airstreams containing aerosols. If the alarm continues, stop using the hood, close the sash and contact EH&S. Fan rotation (reversed polarity will cause fan to run backwards; a backward-running centrifugal fan delivers only 30-50% of rated flow); Clogged or corroded fan wheel and casing; Clogged ductwork (high hood static pressure and low air flow may indicate restricted ducts; open clean-out doors and inspect inside ducts); Clogged collector or air cleaning devices; Weather cap too close to discharge stack (a duct- diameter gap should exist between cap and stack; weather caps are not recommended); Poorly designed ductwork (short radius elbows); (branch entries enter main duct at sharp angles); (ductwork diameter too small for the air-flow needed; and. What is expected? Protector XL Fume Hoods with By-Pass Block are low velocity and high performance. The presence of mold or slime is a possible sign of trouble. Contact PSA today. Ventilation criteria or standards are included in OSHA regulatory codes for job- or task-specific worker protection (see Appendix III:3-3). Before an appropriate ventilation system can be selected, the employer should study emission sources, worker behavior, and air movement in the area. MS115313 - Laboratory Fume Hoods, BSC's, Specialty Hoods and Acid Flammable Cabinets . Such areas should: For more information on investigation of complaints, CSHO's should consult the NIOSH Guidance for Indoor Air Quality Investigation and the EPA guide Building Air Quality (1991). The measurement can be made with a pitot tube or by a static pressure tap into the duct sheet metal (see Figure III:3-3), Figure III:3-3. In practice, replacement depends on mixing efficiency. Protector Airo Filtered Fume Hood - 3' wide , 31.7 depth. Use the fume hood with the sash as low as possible, at or below the indicated operating height. Outside air for ventilation or makeup air for exhaust systems may bring contaminants into the workplace (e.g., vehicle exhaust, fugitive emissions from a neighboring smelter). Perchloric acid hoods shall be prominently labeled Perchloric Acid Hood.. In this example, the fume hood sash is set at the proper height (18 inches). Appendix III:3-4 contains information on points to be checked in a troublesome exhaust system. This list includes but is not limited to OSHA standards that allow concentrations of flammable materials no greater than 10% of the LEL. The types and frequencies of inspections depend on the operation of the system and other factors. An error occurred while submitting your message, please refresh the page and try again. Volatile Organic and Reactive Chemicals (for example, formaldehyde) often contribute to indoor air contamination. The water vapor for the dry ice test should visually draw into the lab. FACTORS YOU SHOULD CONSIDER WHEN PURCHASING LABORATORY FUME HOODS. Protection of employees must be the primary design consideration. Relationship of Capture Velocity (Vc) to Duct Velocity (Vd). Laboratory fume hoods are designed to protect the worker by containing and exhausting harmful or toxic fumes, gases, or vapors from chemicals used in the hood. Its secondary function includes protection against chemical spills, runaway reactions and fires by acting as a physical barrier. Flexi-Bin Cart with 4" bin. Ducts can be made of galvanized metal, fiberglass, plastic, and concrete. Constant Volume: Partial bypass type are appropriate in most circumstances. Workplace investigations of ventilation systems may be initiated by worker complaints of possible overexposures to air contaminants, possible risk of fire or explosion from flammable gas or vapor levels at or near the lower explosive limit (LEL), or indoor air quality complaints. FlaskScrubber Vantage Series Glassware Washer with Viewing Window. Figure III:3-8. A more accurate method is the traverse method, which involves taking six or ten measurements on each of two or three passes across the duct, 90 or 60 opposed. Traditionally, nonindustrial ventilation systems commonly known as heating, ventilating, and air-conditioning (HVAC) systems were built to control temperature, humidity, and odors. A laboratory fume hood is a type of ventilation system that primarily functions to provide personnel protection against toxic fumes, vapors and dust. Learning Library Laboratory Standard & Design Guidelines Print Last updated: December 15, 2022 The Stanford Laboratory Standard & Design Guide is a resource document for use by faculty, staff, and design professionals during the planning and early design phases of a project. For example, are filters loaded or clean? type and concentration of contaminants in the air (because this affects the fan type and materials of construction); and. Investigate the background and objectives of the project. There is only minimal chemical storage in the hood. Most laboratory ventilation systems are designed for labs to have all doors and windows closed. Hoods must be selected from the approved list below: EH&S design guides and specifications are found on the Facilities Project Support page. OSHA and Consensus Standards, Appendix III:3-4. We understand the importance of accurate laboratory furniture budgeting and are well-practiced at quickly producing accurate lab quotes. Then, your PM will oversee your, receiving preliminary design specifications, Metal-Plating and Finishing Products Manufacturer, turnkeyinstallation of new lab furniture, Ventilation certification and other equipment testing. PSA Laboratory Furniture provides full service laboratory design for brand new lab construction and lab renovation projects. Open by-pass fume hoods are designed for operation on constant air volume exhaust systems. Arlington Heights, IL: Air Movement and Control Association. See alsoFumehood Safety Inspectionsand Lab Safety Links. velocity pressures less than 0.05" w.g.). These shutdowns can be the result of planned maintenance work as well as unplanned events such as equipment failureor power outages. Common faulty ventilation conditions and their probable causes are listed in Table III:3-1. For Purifier Logic Biosafety Cabinets with 10" sash opening, For Purifier Logic Biosafety Cabinets with 8" sash opening, For Purifier Logic Biosafety Cabinet with 8" sash opening. Calculate the velocity in feet per minute. One of the primary safety devices in a laboratory is a chemical fume hood. Appendix III:3-1. Avoid use of water sprays in HVAC systems. . Stacks disperse exhaust air into the ambient environment. be exhausted outside the building and not recirculated. 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. It sets standards for ducts and duct installation. For example, a large local exhaust system may also serve as a dilution system, and the HVAC system may serve as a makeup air system (see Appendix III:3-1 for a primer and Appendix III:3-2 for an explanation of these terms). American Conference of Governmental Industrial Hygienists (ACGIH). (Note that some legacy hoods were designed to operate at 100 LFM at full sash height, as high as 25 inches). SMACNA is an association representing sheet metal contractors and suppliers. The meter should always be read in the upright position, and only the tubing supplied with the equipment should be used. Keep the sash at 18 inches or lessfrom the working surface while working in the hood to ensure maximum flow rate and to protect yourself from potential chemical splashes or explosions. Fume hoods provide a safe, enclosed work area for chemical manipulations and provide critical ventilation for the user and laboratory. Fume hoods are chemical- and fire-resistant enclosures that protect lab personnel from inhaling dangerous chemicals by drawing in vapors, gases, and dust before ventilating them out of the laboratory . Worker complaints, improper use of system, nonuse of system, alteration of system by employees. Hood static pressures (SPH) should be measured about 4-6 duct diameters downstream in a straight section of the hood take-off duct. There are five basic types of ventilation systems: Figure III:3-1. Z9.3 - Design, Construction, and Ventilation of Spray Finishing Operations If your hood is not working properly, contact either Plant Operations (343-9675) if you are VU-Central or Plant Operations Medical Center (322-2041) if you are VUMC for assistance. Industrial ventilation generally involves the use of supply and exhaust ventilation to control emissions, exposures, and chemical hazards in the workplace. Emission sources contain materials of relatively low hazard. EH&S may also note any observed problem with controls, sash, baffles, plumbing, lightor corrosion. CAD drawings for 6' Logic Vue Class II Enclosures in the series33006XX. Friction losses vary according to ductwork type, length of duct, velocity of air, duct area, density of air, and duct diameter. The purpose of most ventilation systems is to prevent worker inhalation of contaminants. Excessive employee exposures although flow volumes and capture velocities are at design levels. If air flow is satisfactory in a hood but contaminant control is poor, check: Occupational Safety & Health Administration. Procedures using concentrated perchloric acid (>70%) or heat any amount or concentration of perchloric acid must be performed in a closed system or within a specially designed perchloric acid fume hood with wash down systems to prevent the accumulation of explosive perchlorates in the hood and ducting. bottom, designed to draw air inward by means of mechanical ventilation, operated with insertion of only the Dimensional drawing for 112' Protector XL Benchtop Laboratory Hood with 30" interior depth. Minimize the number of objects stored in the hood keep at least 50% of the working surface clear, if possible. Fume hood controls include constant air volume (CAV), variable air volume (VAV)and two-state (two speed) control. If the duct diameter (D) is 6 inches, then the maximum distance of the emission source from the hood should not exceed 9 in. Do not block the rear hood exhaust slots with equipment or materials. Use filters with a 50-70% collection efficiency rating. American Society of Heating, Refrigerating, and Air-Conditioning Engineers (ASHRAE). Containers are stored too close (within 6 inches) of the face of the hood. All distribute air in a manner designed to meet ventilation, temperature, humidity, and air-quality requirements established by the user. System effect loss is significant if any elbows are connected to the fan at inlet or outlet. and gases and vapors (e.g., scrubbers). Laboratory cabinets are an essential piece of every lab because cabinet configuration is critical to a labs overall function, organization, and efficiency. Whether you need a light duty enclosure for nuisance vapors, a sophisticated hood system for toxic fumes, or specialized ventilation equipment for unique applications, Labconco can offer a perfectly tailored solution. We are committed to an inclusive environment where everyone has the chance to thrive and to the principles of equal opportunity and affirmative action. Industrial Ventilation Workbook. Providing accurate estimates throughout each phase of the project allows us to stand behind a firm price quote upon completion of our final renderings. Stacks. Whether you are located by our Wisconsin headquarters or around the globe, we will be there to set up your new lab. The amount of reentrainment depends on exhaust volume, wind speed and direction, temperature, location of intakes and exhausts, etc. Ventilation and Control of the Work Environment. Air-conditioning has come to include any process that modifies the air for a work or living space: heating or cooling, humidity control, and air cleaning. MS123553 - Laboratory Casework . position exhausts as close to emission sources as possible; make sure employees are upwind of the dilution zone; and. Historically, air-conditioning has been used in industry to improve or protect machinery, products, and processes. The purpose of the fume hood is to contain contaminants and prevent their escape into the laboratory. Hood-face velocity measurement involves the following steps: measure velocity at center of each area; and. Fume . 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. Do not use fume hoods when the ventilation system serving a room is not functioning. Z9.4 - Ventilation and Safe Practice of Abrasive Blasting Operations 5' Protector Pass-Through Laboratory Hood CAD Drawing (pre-2014) 5' Protector Pass-Through Laboratory Hood with Viewing Window CAD Drawing (pre-2014) If a hood fails an inspection, it may need to be taken out of service until repaired. Dimensional drawing for 16' Protector XL Floor-Mounted Laboratory Hoods with Horizontal-Sliding Sashes manufactured after August, 2014. General exhaust ventilation, also called dilution ventilation, is different from local exhaust ventilation because instead of capturing emissions at their source and removing them from the air, general exhaust ventilation allows the contaminant to be emitted into the workplace air and then dilutes the concentration of the contaminant to an acceptable level (e.g., to the PEL or below). PSA offers a complete line of high-quality extras to make your lab fully functional. Lack of make-up air (high negative pressures affect propeller fan system output; lack of supplied make-up air causes high airflow velocities at doors and windows). CAD drawings for 4' Logic Vue Class II Enclosures in the series33004XX. Vanderbilt University Medical Center A number of older wood fume hoods and fume cupboards are still maintained. Measurements are made in the center of concentric circles of equal area. Our laboratory designers can provide a free lab drawing to meet your specifications. Health-Related Ventilation Standards. An Illustration of the Six-and-Three Rule. EH&S will notify the researchers and post a Do Not Use sign if repair is required. Elements of a Good Maintenance Program. Type of application - the construction of the fume hood must be durable to handle the work done. (Check dimensions and lengths with a ruler or a scale to be sure that this is the case. American Society of Heating, Refrigeration and Air-Conditioning Engineers, Inc. Sheet Metal and Air Conditioning Contractors' National Association, OSHA Technical Manual (OTM) - Section III: Chapter 3. facilities failing to provide adequate maintenance of ventilation equipment; facilities operated to maximize energy conservation; closed blast gate to branch, or opened blast gates to other branches, or corroded and stuck blast gates, fan turning in reverse direction (This can occur when lead wires are reversed and cause the motor and fan to turn backwards. 230920 Laboratory Terminal Air Flow Units and Controls . Will the project meet OSHA requirements if it is built as proposed? The minimum velocity that can be read by an anemometer is 50 feet per minute (fpm). Specific points to consider during any investigation of a ventilation system include emission source, air behavior, and employee involvement. A fume hood is an exhaust system designed to remove fumes from a laboratory or work area. An evaluation by a mechanical engineer (or other qualified party) and a design is often needed before procurement is authorized. . If an organic or reactive chemical (e.g., formaldehyde) is believed to be the primary agent in an IAQ problem, potential controls to consider include additional dilution ventilation, removal or isolation of the offending material, and the transfer of sensitized employees. Foremost are those recommended by the Air Movement and Control Association (AMCA), the American Society of Heating, Refrigerating, and Air-Conditioning Engineers (ASHRAE), the American National Standards Institute (ANSI), the Sheet Metal and Air Conditioning Contractors National Association (SMACNA), the National Fire Protection Association (NFPA), and the American Conference of Governmental Industrial Hygienists (ACGIH). Stack height should be 10 ft higher than any roof line or air intake located within 50 ft of the stack (Figure III:3-8). Elevations (side and front views) give the most detail. Ventilation Primer What is to be included and why? Dimensional drawing for 8' Protector XL Floor-Mounted Laboratory Hoods with Horizontal-Sliding Sashes manufactured after August, 2014. EOE/AA/Women/Minority/Vets/Disabled, Copyright 2023 by Vanderbilt University Medical Center. Fume hoods are installed in laboratories to protect workers from hazardous vapors generated by laboratory experiments. Dimensions are provided for 4' and 6' Purifier Logic Class II, Type B2 Biosafety Cabinets. The hood converts duct static pressure to velocity pressure and hood entry losses (e.g., slot and duct entry losses). The laboratory chemical fume hood is the most common local exhaust ventilation system used in laboratories and is the primary method used to control inhalation exposures to hazardous substances. Height (Metric) 149.9 cm. Most hood design recommendations account for cross-drafts that interfere with hood operation. SECTION 115313 - LABORATORY FUME HOODS . In some cases the employer may wish to seek the services of an experienced professional ventilation engineer to assist in the data gathering.
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