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. When used properly, fume hoods offer a significant degree of protection for the user.

Understanding the limitations, the appropriate maintenance techniques, and overall design of the fume hood will ensure your safety while using hazardous materials.

In the event of an accidental spill, the fume hood will contain the spilled chemicals and exhaust the fumes away from the user and laboratory zone. To determine if a chemical is required to be used inside of a chemical fume hood, first check the Safety Data Sheet SDS. As a best practice, always use a chemical fume hood for all work involving the handling of open chemicals e. A chemical fume hood is a ventilated enclosure used to trap and exhaust vapors, gases, and nanoparticles.

The exhaust fan is typically stationed at the top of the building and pulls air through the duct work connected to the hood and exhausts it into the atmosphere. The sash protects the user. Baffles may be adjustable and the position is dependent on the vapor density of the chemicals used. The face of the hood is parallel to the vertical sash and is the plane where face velocity measurements are taken. Vertical : The sash rises up and down and is optimal for shielding the user from contaminants with a large glass window pane.

When not in use, close the vertical fume hood sash for the greatest level of safety and containment. This practice will improve air quality in laboratories and reduce energy use.

fume hood schematic

Horizontal : The sash moves side to side and is comprised of multiple window panes. This gives the user more freedom to work in a certain area of the fume hood while reducing costs because the sash is never completely open. REM will post an approval sticker specific to the horizontal sash openings, affirming the horizontal sash opening in inches.

When not in use, close the horizontal fume hood panels for the greatest level of safety and containment. Combination : This is a sash designed with a horizontal pane system built into the vertical sash. 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.

Only use sash in one direction at a time. When not in use, close both the sash and horizontal panels for the greatest level of safety and containment. 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. As the sash is opened and closed, the air velocity at the face of the hood will change. Variable Air Volume VAV : This type of fume hood contains a face velocity control, which controls the fan speed to maintain a constant air velocity at the face of the hood.

This type of exhaust allows for optimal hood performance regardless of the sash position, and provides significant energy savings by reducing the air flow rate when the sash is closed. Calling PF engineering to have your fume hood shut off can reduce the electricity used to power the fan, thus conserving energy, reducing greenhouse gas emissions, and saving your University thousands of dollars per year.

High Performance : These fume hoods have containment-enhancing features allowing them to operate at lower face velocities while protecting the operator. Since less room air is exhausted, energy is conserved. REM will tag high performance hoods with a special standard operating procedure sticker, informing users of the appropriate air velocity range determined by the University.

Perchloric Acid : Special hoods equipped with a stainless steel or PVC duct and properly timed water wash down system. The wash down system must be used following each use of the acid hood. Using perchloric acid in a general lab fume hood may cause the acid vapors to settle onto the ductwork and create explosive perchlorate crystals. Serious injury or fatality may result to hood users or maintenance staff if the acid crystals are exposed to vibration and detonate.

Strong acids are corrosive to the duct work found in general lab fume hoods. Fume hoods constructed from polypropylene material are long-lasting and designed to resist harsh chemicals for years.Labconco offers a laboratory fume hood for every application.

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. For help finding the right chemical fume hood, try our article, "How to select the correct fume hood for your applications. Let us know what's important to you, whether it's energy efficiency, space conservation, or if you have unique requirements that call for a custom fume hood design.

Versatile high performance fume hood options for your laboratory's general chemistry applications. These energy-efficient benchtop hoods have containment-enhancing features that allow them to operate at face velocities as low as 60 fpm. These benchtop hoods have a one-piece molded fiberglass-reinforced polyester liner.

With three available depths, these panel-lined benchtop hoods offer superior design flexibility for general chemistry applications.

Our most energy-efficient benchtop hoods have containment-enhancing features that allow them to operate at face velocities as low as 60 fpm. Their integrated sash position sensors automatically adjust the blower speed as the sash is raised or lowered. The integrated sash position sensors automatically adjust the blower speed as the sash is adjusted. These panel-lined benchtop hoods offer superior design flexibility for general chemistry applications. Plus, they offer automatic blower speed adjustment via integrated sash position sensors.

These benchtop panel-lined hoods have sashes on two sides allowing operation on either side of the fume hood. These low profile benchtop enclosures have clear sides, top and sash for light duty fume hood use or classroom demonstrations. These fully-featured benchtop hoods have clear back and sides for enhanced visibility for conducting demonstrations or observing students. Fully-featured hoods that require no ducting. Comprehensive filters contain acids, bases and solvents.

No ducting. Our fully-featured, containment-enhancing fume hood with Erlab's Neutrodine Unisorb technology. Versatile filtered fume hood for limited benchtop space.

DH III or better protection. Multi-use fume hood with no ducting. Floor-mounted chemical fume hoods allow the user to place large items into the hood at floor level. PVC and stainless steel hoods for use with perchloric acid, acid digestion, and radioisotopes. These benchtop PVC-lined hoods feature polycarbonate sashes, which are recommended for applications involving the use of acids including hydrofluoric acid. Featuring washdown systems, integral work surfaces and drainage troughs, these benchtop PVC-lined hoods are designed specifically for procedures involving perchloric acid.

Featuring washdown systems, integral work surfaces and drainage troughs, these benchtop stainless steel-lined hoods are designed specifically for procedures involving perchloric acid. With fully sealed integral work surfaces and coved interiors, these benchtop stainless steel-lined hoods provide protection from applications requiring the use of radiochemicals.

These economical powder-coated steel-lined benchtop hoods have a smaller overall height and depth than traditional hoods so they fit in tight areas.Sometimes it seems that almost everything in a laboratory is governed by an alphabet soup of government agencies and regulations. Their installation, operation and maintenance are guided by a variety of governmental and industry organizations.

Fortunately, understanding who and what determines proper fume hood operation is not as difficult as it might first seem.

Codes, Standards and Recommended Practices The following are the primary organizations and standards regarding fume hoods:. The agency regulations regarding fume hood operation are listed in the Code of Federal Regulations Volume 29 Part This code addresses several aspects of laboratory design and operation. Regarding hoods it is primarily concerned with airflow at the face of the hood, monitoring, maintenance and exhaust.

It concerns itself primarily with methods of testing fume hoods to check their operation. It covers a variety of lab ventilation issues including hood monitoring, face velocities and exhaust.

This standard is prepared by the National Fire Protection Association. It recommends hood construction, location, fire protection, specialty hoods, identification, inspection, testing and maintenance and exhaust. Special Concerns Items of immediate interest to lab personnel that are addressed in the codes and standards include:. Proper air flow at the face of the hood is probably the most common cause of confusion regarding fume hood operation. Here are what the codes and standards say:.

Typically fpm. Note: Governmental codes rules and regulation may require specific face velocities. A fume hood face velocity of fpm is considered acceptable in standard practice.

fume hood schematic

In certain situations face velocity of up to fpm or as low as 75 fpm may be acceptable to meet required capture velocities of the fume hood. If this is not possible, work with substances of unknown toxicity should be avoided or other types of local ventilation devices should be provided. Exception: In lieu of a sign, a properly maintained log of all hoods giving the above information shall be deemed acceptable.

Lab personnel rarely crawl up onto the roof to check out their exhaust fans and stacks. If you have any questions feel free to give me, Bruce Ciloski, a call.

You can reach me at Your email address will not be published.This pictorial diagram shows us a physical connection that is much easier to understand in an electrical circuit or system. An electrical diagram can indicate all the interconnections, indicating their relative positions. The use of this Array can be positively recognized in a production project or in solving electrical problems. This can prevent a lot of damage that even derail electrical plans.

The layout facilitates communication between electrical engineers designing electrical circuits and implementing them. The pictures are also helpful in making repairs. It shows whether the installation has been appropriately designed and implemented while confirming the safety regulators. A usually gives information about the relative position and arrangement of devices and terminals on the devices, to help in building or servicing the device.

This is unlike a schematic diagram, where the arrangement of the components interconnections on the diagram usually does not correspond to the components physical locations in the finished device. A pictorial would show more detail of the physical appearance, whereas a wiring diagram uses a more symbolic notation to emphasize interconnections over physical appearance.

Fume Hood Schematic show the circuit flow with its impression rather than a genuine representation. They only provide general information and cannot be used to repair or examine a circuit. The functions of different equipment used within the circuit get presented with the help of a schematic diagram whose symbols generally include vertical and horizontal lines. However, these lines are known to show the flow of the system rather than its wires.

A represents the original and physical layout of electrical interconnections. Wiring on the picture with different symbols shows the exact location of equipment in the whole circuit. Its components are shown by the pictorial to be easily identifiable. They are often photos attached with highly-detailed drawings or labels of the physical components.

A person with a strong knowledge of electrical wiring diagrams can only understand a pictorial. Arrangement of air-curtain fume hood.

Chemical Fume Hoods

Download Scientific DiagramResearchGate. Automatic fire extinguishing equipment of a fume hood - diagram, schematic, and image 05Patents. Schematic diagram of aerosolization setup in fume hood with details Dimensions of air-curtain fume hood.

What is a Ductless Fume Hood? Related Fume Hood Schematic.Please download our latest PDFs for more detailed information on our products and their features. Each of these downloads requires Adobe's Acrobat Reader software. The AVT can be utilized for direct airflow measurement and closed-loop control by the site building automation system or through an Accutrol Airflow Controller.

The AVC provides a stand-alone control function and is designed for applications that require fast speed of response and precise airflow measurement. It can also be utilized for direct airflow measurement and set point control by the site BAS. The Cage Rack AVC provides true airflow measurement to ensure proper airflow into and out of vivarium cage racks.

Instead of guessing whether the proper flows are being maintained, the AVC ensures that they are. An optional airflow monitor is also available with local alarming and set point adjustment right at the display.

The airflow monitor can be mounted conveniently in the area of the cage rack. It can also be utilized for direct airflow measurement and constant volume set point control by the site BAS. The APEX is suitable for use on all types of fume hoods and biological safety cabinets. This monitor is suited for use on all types of fume hoods including constant volume, variable volume and high performance low flow hoods. It is available with display and setpoint adjustment slider options.

User configurable IO points give the ability to set each hardware termination to function exactly as desired with virtually any end device on the market today. AccuValve Submittal Drawing Model AVT Submittal drawing for the AccuValve AVT includes figures, model code, size and weight, operating range, installation instructions, installation diagrams, wiring instructions, wiring diagrams and electrical specifications.

This guide is to assist the designer in sizing the AccuValve so as to achieve minimum system pressure drop. AccuValve — Airflow Measurement without Straight Runs By Design The AccuValve was designed to develop a uniform velocity profile condition within the airflow valve eliminating the requirement for straight duct runs to accurately measure airflow.

Low Pressure Drop By Design When the design criteria for the AccuValve were being evaluated, minimizing the pressure drop of the valve was the highest priority. The inspiration for the design of the AccuValve originated from analysis of the design of a silencer.

Demand Based Static Pressure Reset Control for Laboratories The goal of this paper is to show the advantages of Demand Based Static Pressure Reset Control for use in laboratories and how it can reduce the system static pressure that the mechanical systems operate at, thus reducing the operating cost and lowering the carbon footprint of the building. AccuValve Sound Performance Data Accutrol provides AccuValve sound performance data for exhaust, supply discharge and radiated operating conditions.

The AccuValve Energy Savings Calculator will show the impact of substantial energy savings over the design of competitive airflow valves. The SRPM can be configured to monitor positive, negative or neutral pressure in protected environments and hospital isolation rooms per CDC guidelines. Accutrol SRIM Accutrol's Room Isolation Monitor is designed to measure and display true low pressure differential in pharmaceutical, hospital, laboratory and research facilities.

In a hospital, laboratory or animal research facility, the integrity of the ventilation control system is at the heart of a contaminant free environment.

Whether a room is to be maintained at a negative pressure to prevent contaminants from escaping into adjacent areas or positive pressure to protect patients with compromised immune systems, the proper pressurization of the room is essential.

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Fume Hoods & Enclosures

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fume hood schematic

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