Office of Chemical Safety When not in use, close the vertical fume hood sash for the greatest level of safety and containment. This includes adding, removing, or changing any of the fume hood components, such as baffles, sashes, airfoils, liners, and exhaust connections. Reduce energy consumption of fume hoods by continuous occupancy assessment and monitoring contaminants within critical environment spaces to achieve optimum airflow. Standards for determining permissible exposure limits include: WebFume hoods are essential for the containment of dangerous fumes and for the protection of occupants in the lab. The typical fume hood found in Princeton University laboratories is equipped with a movable front sash and an interior baffle. Understand what a fume hood is - A fume hood is an enclosure that is designed to capture and contain harmful chemical vapors. It is unsafe for lab users to insert their body or head inside the hood, beyond the front sash. WebWhat to do when using laboratory fume hoods 1. CDC twenty four seven. Standards for determining permissible exposure limits include: Types of fume hoods at the Universityinclude chemical, radioisotopeand perchloric acid hoods, with various airflow controls. In order for fume hoods to provide protection, users must follow basic safety practices. The fume hood is connected to a remotely located blower by ductwork. Health and lab safety guidelines require stringent handling of fumes and appropriate technology to ensure proper air quality is maintained. A fume hood will constantly move contaminated air away from the operator and push it through the exhaust system of the building and outside into the atmosphere. The baffles should be kept at the back of the hood so that it is not disturbed when at work. These serve a general purpose and are good for tasks that dont have special requirements. Recommended Work Practices. They provide users with protection against vapors, gases, or dusts given off by hazardous materials used in the lab. If the alarm persists, close the sash and wait a moment and then reopen the sash to your working height. Place large equipment on blocks. Once a work order is placed to Zone Maintenance by either your building deputy or REMs Industrial Hygiene section, a sign will be posted on the fume hood stating the hood is not safe to use and repairs are in process. The second photo is an improvement of the first, but half-way inside is still not the optimal position for exhausting fumes. The certification test includes mandates like how the hood reacts to laboratory room pressure differences. Perchloric acid fume hoods can only be used to deal with perchloric acid; other chemicals could cause dangerous reactions. These shutdowns can be the result of planned maintenance work as well as unplanned events such as equipment failureor power outages. WebFume Hoods. Laboratories can experience ventilation shutdowns. Do you want to recognize one of our staff for a job well done? Purdue University, 610 Purdue Mall, West Lafayette, IN, 47907, 765-494-4600, 2019 Purdue University|An equal access/equal opportunity university|Integrity Statement|Copyright Complaints|Brand Toolkit|Maintained by Administrative Operations, ContactAdministrative Operationsfor accessibility issues with this page |Accessibility Resources|Contact Us. If you ever suspect changes in airflow while working, take a break to check things out. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); 2021 All Rights Reserved by iGene Labserve. This ventilation is often the best engineering control available to keep chemical exposure below exposure limits. They can be very noisy owing to the internal blowers. To receive email updates about this page, enter your email address: LabTrainingVR: Personal Protective Equipment (PPE) Edition, Fundamentals of Chemical Fume Hood Safety, Fundamentals of Working Safely in a Biological Safety Cabinet, Centers for Disease Control and Prevention. Chemical fume hoods, when used properly, are one of the most reliable engineering controls in the laboratory. Constant Air Volume (CAV): This type of fume hood exhausts the same amount of air at all times, regardless of the horizontal or vertical sash position. document.getElementById( "ak_js_3" ).setAttribute( "value", ( new Date() ).getTime() ); This field is for validation purposes and should be left unchanged. WebChemical Fume Hoods. These fume hoods cannot support high temperatures and toxic chemicals. You may notice this sticker placed on your fume hood; indicating that it operates as a VAV hood. Most of our items can be shipped quickly. Instead of ventilating harmful fumes through a duct, ductless fume hoods use filtration to remove harmful gases from the air. All fume hoods have a face air velocity indicator which will alarm if there is a loss of airflow. If you have concerns about how to use your fume hood properly or how to handle materials in your fume hood contact Chemical Safety at 608-265-5700. Fume Hood Use When not in use, close the horizontal fume hood panels for the greatest level of safety and containment. If a department is purchasing or owns a ductless fume hood, they must develop written laboratory standard operating procedures (SOPs) that must include the following: Performance indicators are important safety devices that must be monitored regularly and are necessary for every chemical fume hood on Purdues campus. WebAbout Contact Testimonials What Are Fume Hoods Used For? Likewise, walking near the hood opening or making quick motions in or out of the hood may have a similar effect. Occasionally, the REM department is asked to approve purchases of ductless, filtered fume hoods for use in research labs. They provide users with protection against vapors, gases, or dusts given off by hazardous materials used in the lab. Keep in mind that you must have proper filters for the process and chemicals that you are using in a portable fume hood. The average face velocity ranges from 100 fpm to 120 fpm. Detailed instructions for use of the fume hood can be found in the Lab Safety Manual. The slots and baffles within the hood direct the air and, in many hoods, can be adjusted to allow the most even flow. Do you want to recognize one of our staff for a job well done? Make sure that nothing is ever blocking this area and only the chemicals you need for the procedure are inside of the hood. Air vents at the back of the fume hood body, known as baffles, are used to regulate that flow and maintain a constant velocity. 1). REM will measure the air velocities of each sash position and post the working height along with the horizontal sash sticker to the fume hood. For example, splash goggles, gloves, and a full face shield may be needed for acid testing. All chemical fume hoods should also be labeled with a yellow lab hood operating procedures sticker specific to general and high performance fume hoods. Laboratory fume hoods provide operator and environmental protection from hazardous fumes, particulate, and other gases. Keeping toxic fumes and particulate matter that can damage your lungs out of your workspace is essential to the safety of your employees and the lab itself. A chemical fume hood is the main piece of laboratory equipment that protects laboratory staff working with hazardous chemicals. Local exhaust ventilation is one of the best engineering methods available to reduce the health hazard risk associated with the use of hazardous chemicals in the laboratory. Required fields are marked *. fume hoods are used in the laboratory Use the personal protective equipment (PPE) provided by your lab, such as goggles, gloves, face shields, and aprons. WebThis is used to: protect the user from inhaling toxic gases (fume hoods, biosafety cabinets, glove boxes) protect the product or experiment (biosafety cabinets, glove boxes) protect the environment (recirculating fume hoods, certain biosafety cabinets, and any other type when fitted with appropriate filters in the exhaust airstream) The hood can contain vapor, dust particles, gases and any fume arising within the hood. Strong acids are corrosive to the duct work found in general lab fume hoods. 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. Combination: This is a sash designed with a horizontal pane system built into the vertical sash. Do not use fume hoods when the ventilation system serving a room is not functioning. No matter how well a fume hood is designed, it wont be effective unless proper laboratory safety measures are taken. Keeping toxic fumes and particulate matter that can damage your lungs out of your workspace is essential to the safety of your employees and the lab itself. Save my name, email, and website in this browser for the next time I comment. If the alarm sounds, stop operations, seal all containers, and close sash fully. Personal Protective Equipment (PPE):Must be worn in accordance to your labs hazard assessments including: lab coat, safety glasses/goggles, gloves, aprons, and the minimum lab PPE required in the CHP (Chemical Hygiene Plan). The benchtop exhaust hood sits on a workbench. Contact Physical Plant Customer Service at 608-263-3333 for repairs. Prominently posted signage informing users, lab personnel, and maintenance personnel of the following: The chemicals allowed to be used in the hood, The type of filterused, its limitations and change schedule, Filter collection efficiency and breakthrough properties may change where multiple chemicals are used, resulting in earlier filter breakthrough, Noticeand warnings that the hood recirculatesair inside the room and many low molecular weightchemicals can be stripped from the filter and reenter the room, Average face velocity measurementin feet per minute (fpm), Approved use status (storage,general chemistry, radioisotopes, carcinogen/toxic chemicals), Horizontal window sash opening measurement (in inches)or an arrow indicating safe vertical sash open height. Hoods must be selected from the approved list below: EH&S design guides and specifications are found on the Facilities Project Support page. Fume hoods remove this air through a duct and out of the building, or they use a filtration system to filter the toxic particles out before releasing the air back into the lab. Fume hood controls include constant air volume (CAV), variable air volume (VAV)and two-state (two speed) control. Standard Fume Hood Operating ProceduresGeneral Use: 80 fpm FV 125 fpmStorage Only: FV < 80 fpm or FV > 125 fpm, High Performance Fume Hood ProceduresGeneral Use: 70 fpm FV 100 fpmStorage Only: FV < 70 fpm or FV > 100 fpm. Laminar Air Flow: Some Important Things You Must Know. WebLaboratory Fume Hoods. Remember to keep the hood closed whenever possible. Fume Hoods Make sure that nothing is ever blocking this area and only the chemicals you need for the procedure are inside of the hood. The room pressure must not affect the non-laboratory space.The latest certification stickers must be displayed.The sash movement must be seamlessThe alarm system should work efficientlyThe face velocity should be within the domain of 100 linear feet/minThe overall fume hood condition must be inspected.The equipment should follow the certification standards applied by all the authorities that have certified the product. For example, splash goggles, gloves, and a full face shield may be needed for acid testing. 2. Variable air volume (VAV) - where the exhaust flowrate or quantity of air pulled through the hood varies as the sash is raised or lowered in order to maintain a constant face velocity. Fume Hoods They filter the air to prevent the inhalation of toxic particles that can lodge in the lungs and cause serious health implications. When using a walk-in hood, close the bottom sash to the floor and only raise the top sash to REMs designated working height. The certification sticker lists when the hood was last tested and its. Make sure the pathways to these areas are unobstructed. 2. Keeping toxic fumes and particulate matter that can damage your lungs out of your workspace is essential to the safety of your employees and the lab itself. The sash works as a safety shield in the case of an explosion. A difference in 0.05inches of water column of the recorded reading may indicate air velocity changes to your fume hood. In this configuration, when the sash is lowered and the cross-sectional area of the hood opening decreases, the velocity of airflow (face velocity) through the hood increases proportionally.
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