Duct Fume Hood
Duct fume hoods have ventilated enclosures, operate within the framework of your building infrastructure and pull contaminants out of your building through the HVAC system.
Description
What is Duct Fume Hood
Duct fume hoods have ventilated enclosures, operate within the framework of your building infrastructure and pull contaminants out of your building through the HVAC system. Ducted fume hoods have a base, work surface, hood, blower and ducting that carries the air outside of the building.
Duct Fume Hoods have proper ventilation
Breathing in harmful chemicals can cause toxins to lodge in your lungs or enter the bloodstream. While inhaling vapors may only result in dizziness at first, over several years it can cause liver damage. By design, a Duct Fume Hood provides a barrier between lab workers and toxic fumes by filtering the air inside the laboratory.
Ducted Duct Fume Hoods remove the air from the laboratory and disperse it into the atmosphere outside. While many ducted hoods employ constant air volume (CAV) systems, variable air volume (VAV) systems are a new generation of hoods that reduce energy costs. VAV systems reduce the volume of the air exhausted as the Duct Fume Hood sash is closed.
Duct Fume Hoods are designed for explosions
While they aren't designed to handle every incident, a properly installed Duct Fume Hood will protect from small explosions and fires.
The sash acts as a shield in the case of an explosion or fire. It is designed to withstand impact, so in the case of an explosion, the glass will "spider" instead of shatter.
The sash should always be shut when the hood is not in use. If an explosion occurs when the sash is open, the glass and contents inside the hood will be spread around the laboratory, potentially harming other lab personnel.
Duct Fume Hoods control and contain spills
Spill containment lips help to contain minor liquid spills. These lips are several inches wide and act as catch basins for spills or breaks.
These "troughs" are the new standard for Duct Fume Hoods, but most older hoods don't come with this feature. However, additional spill containment products can be purchased for older hoods.
While Duct Fume Hoods are crucial, they cannot protect against every laboratory hazard. Extremely hazardous tasks require specially designed equipment. Nevertheless, Duct Fume Hoods remain indispensable in any laboratory setting.
General Use: Commercial Furniture
Type: Laboratory Furniture, Laboratory Furniture
Mail packing: N
Application: Hospital, School, Other
Design Style: Modern
STRUCTURE: C frame/ H frame/ Pedestal/ Free standing
SIZE: Wall Bench: L*750*850mm/ Island Bench:L*1500*850mm, can be customized
COLOR: Optional
General Use: Commercial Furniture
Type: Laboratory Furniture
Mail packing: N
Application: Home Office, Living Room, Hotel, Office Building, Hospital, School, Other, Hall
Design Style: Modern
General Use: Commercial Furniture
Type: Laboratory Furniture
Material: Metal
Metal Type: Iron
Place of Origin: Jiangsu, China
STRUCTURE: C frame/ H frame/ Pedestal/ Free standing
SIZE: Wall Bench:L*750*850mm/ Island Bench:L*1500*850mm, can be customized
COLOR: Optional
HANDLE: stainless steel handle/ aluminum alloy handle
HINGE: DTC 175 degree open type hinge/ stainless steel hinge
Specific Use: School Sets
General Use: Commercial Furniture
Type: School Furniture
Mail packing: N
Application: School
General Use: Commercial Furniture
Type: Laboratory Furniture
Mail packing: N
Application: Home Office, Living Room, Hotel, Office Building, Hospital, School, Other, Hall
Design Style: Modern
Material: Metal
Place of Origin: Jiangsu, China
Brand Name: Beito
BT-f0001: Work Bench-School Table & Stool
Product name: work bench physical chemistry lab table for university lab
STRUCTURE: C frame/ H frame/ Pedestal/ Free standing
SIZE: Wall Bench: L*750*850mm/ Island Bench: L*1500*850mm, can be customized
COLOR: Optional
HANDLE: stainless steel handle/ aluminum alloy handle
HINGE: DTC 175 degree open type hinge/ stainless steel hinge
Why Choose us
Quality Assurance
We have mechanical and electrical installation, decoration and laboratory furniture sales, all of which have passed the ISO9001 quality management system certification, ISO14001 environment management system certification and OHSAS18001 occupational health and safety management system certification.
Quality services
Our team is committed to delivering high-quality services to our clients. We use the latest technologies and tools to ensure that our services exceed your expectations.
Experience and expertise
Our company has been in business for many years and has amassed significant expertise and experience to provide quality services to our clients.
Duct fume hoods operate based on the principle of containment and ventilation. When a researcher conducts an experiment or handles hazardous materials inside the fume hood, the harmful substances are released into the enclosure. The sash or door of the hood acts as a physical barrier, preventing the escape of these substances into the laboratory air. Simultaneously, the exhaust fan creates negative pressure within the fume hood, drawing the contaminated air toward the duct system and expelling it outside the building.
The airflow within the duct fume hood is carefully controlled to ensure optimal containment and safety. Face velocity, which refers to the speed of air moving through the hood opening, is maintained at a specific level to capture the released substances effectively. The airflow patterns inside the hood are designed to minimize turbulence and maximize the containment of hazardous materials.
Duct Fume Hood
A duct fume hood is essential lab equipment. It is also known as a vented fume hood. It is designed to extract hazardous fumes and vent them outside the building. They are connected to an exterior exhaust system through a duct network. They are used in labs dealing with a high volume of hazardous or volatile substances.
Advantages
The duct fume hoods have the following benefits:
High Capacity
Duct fume hoods can handle many chemicals, including highly toxic and radioactive substances.
High Efficiency
They can effectively remove all types of fumes, particulates, and aerosols, reducing the risk of exposure.
No Filter Replacement
Unlike recirculating hoods, they do not require filter changes, which can be a cost and maintenance benefit over time.
Continuous Removal of Contaminants
Since the contaminated air is expelled from the building, there is no risk of re-circulating harmful fumes back into the lab.
Recirculating Fume Hoods
A Recirculating fume hood is also known as a ductless fume hood. It filters the contaminated air through activated charcoal and other specialized filters and then recirculates it back into the lab.
Advantages
Ductless fume hoods have the following advantages:
Easy Installation
Recirculating hoods are independent units that do not require an elaborate ductwork system, making them easier and quicker to install.
Energy Efficiency
They recycle the conditioned air within the laboratory, making them more energy-efficient than duct fume hoods.
Mobility
They can be moved easily within the lab as per changing requirements.
Making a Choice: Ducted Vs. Recirculating Fuming Hoods
Choosing between ducted vs recirculating fume hoods depends on several factors, which are as follows:
Type of Chemicals Used
A duct fume hood might be the better choice if your lab handles a wide range of chemicals, especially those generating hazardous gasses. In contrast, a recirculating fume hood can be suitable for labs dealing with a narrow, known spectrum of chemicals compatible with the filters.
Budget Constraints
A recirculating fume hood could be more cost-effective due to its easy installation and energy efficiency features.
Lab Flexibility
If you need the flexibility to move or rearrange lab equipment frequently, a recirculating fume hood would be a more practical choice.
Fume Hood vs Safety Cabinet: Which One is Better?
Fume hoods are often confused with safety cabinets. It is important to understand the difference between the two. A fume hood is significantly different from a safety cabinet. A fume hood ventilates and removes hazardous fumes and particles, protecting lab users from toxic airborne substances.
In contrast, a safety cabinet (or biosafety cabinet) is designed to contain biohazardous materials, providing a sterile environment and preventing experiment contamination to the user.
A fume hood is better at containing and venting off hazardous fumes, making it ideal for experiments with volatile or toxic substances. Whereas a safety cabinet might not fully protect you from these dangerous vapors. So, fume hoods are more dater and better than safety cabinets.
Meanwhile, fume hoods play an essential role in ensuring the safety of laboratory environments. Both ducted and recirculating fume hoods have their unique strengths and limitations.
The choice between a ducted and a recirculating fume hood should be made carefully - considering the type of chemicals used, budget constraints, and flexibility within the lab setup. By understanding each type's unique features, benefits, and limitations, laboratories can select the most suitable fume hood that aligns with their specific needs and maintains the highest level of safety.
Duct Fume Hood Buying Tips: What To Look For In A Duct Fume Hood
Size. A basic starting point when shopping for and specifying a duct fume hood is size. What size is the working area required for your application? What size is the available space on the factory floor or the laboratory for a duct fume hood?
Materials. Some chemistries require specialized materials for containment. Highly corrosive acids at high concentrations, for example, often require a duct fume hood constructed from polypropylene rather than stainless steel for better corrosion resistance. For hydrofluoric acid, polycarbonate is the preferred material for the sash, to avoid etching of a glass window. Knowing the expected chemistry that will be put in the duct fume hood is crucial to ensuring years of reliable functioning.
Standards. Does your duct fume hood need to meet certain industry standards, such as fm 4910? Does your chemical process need to meet other specialized standards or requirements? Sometimes a "one-size-fits-all" duct fume hood just won't work. In those cases, look to the applications engineers at best technology for a customized duct fume hood.
Window orientation. Some duct fume hoods use a horizontal sliding window, which limits the access of the operator to the working area inside the duct fume hood. Look for a vertically sliding window (sash), so that users have more available working area in the interior of the duct fume hood. Best technology offers duct fume hoods with counterbalanced, vertically sliding windows.
Avoid ductless duct fume hoods. A ductless duct fume hood, also called a recirculating duct fume hood, uses a blower on the duct fume hood to pull contaminated air through a hepa filter, and then recirculates the air back into the room. The type of filter required varies depending on the chemistry, so the operator must ensure use of the proper filter for safety. Filters also must be changed regularly for safety.
Duct Fume Hoods: How To Choose The Right Duct Fume Hood For Your Laboratory
What type of work are you conducting inside your duct fume hood
Review your experiment methods and material lists.
Document which chemicals, or solvents, you will be using and the concentration of each chemical
Determine the evaporation rate of the chemicals.
Chemical solvents evaporate at different rates and if not accounted for, can overwhelm the duct fume hood by evaporating at a rate too fast for the duct fume hood to ventilate.
What size lab hood do you need?
Will you have equipment inside your laboratory duct fume hood?
How large is the equipment?
If your application involves extra-large equipment, such as drum containers, a walk-in duct fume hood might be appropriate.
How many people will be working simultaneously under the duct fume hood?
Depth – Consider buffer space.
Perform your work at least 6 inches behind the sash to ensure a safety buffer zone is maintained.
Height – Make sure your lab has ample height clearance for a larger bench top or floor mounted duct fume hood.
How will fumes be filtered and exhausted?
Duct or ductless
A ducted duct fume hood connects to a remote blower of the facility hvac system to safely remove noxious or dangerous chemicals from the work area.
A ductless duct fume hood contains an integral blower, carbon filters to capture chemical vapors and, if required, hepa/ulpa particle filters to allow recirculation of exhaust air.
Which ventilation system should you use for a ducted duct fume hood?
A ducted duct fume hood has two (2) options for ventilation control, constant air volume (cav) and variable air volume (vav).
To choose between cav and vav, you will need to take into consideration both operating duration and budget.
What are the operating costs and install of a duct fume hood?
Operating costs:
Ductless duct fume hood = The majority of operating costs for a ductless duct fume hood will come from filter charges.
Ducted duct fume hood = The cost of operating a ducted duct fume hood can be calculated as a function of how much air the blower is exhausting. Thus, the operating cost increases as a function of volume of air (dfm) being moved.
What accessories will you need for your duct fume hood?
Duct fume hood accessories include base cabinets, light fixtures, airflow monitors, electrical outlets, cup sinks, and service fixtures for water, vacuum, or gas.
As a leader in scientific equipment repair and medical equipment calibration, scientific instrument center work with many corporations, universities, and hospital providing the highest level of laboratory services.
Company Introduction
Beito Laboratory Equipment Co., Ltd. is a laboratory furniture and laboratory equipment manufacturer integrating R & D, design, manufacturing and sales.
We have a steel wood and PP workshop covering an area of 3000m2, a steel workshop covering an area of 3500 m2, and a complete set of spraying assembly lines. It is a large-scale laboratory equipment manufacturing enterprise in China,focusing on the field of high-end laboratory engineering.
Our Certificate
We have mechanical and electrical installation, decoration and laboratory furniture sales, all of which have passed the ISO9001 quality management system certification, ISO14001 environment management system certification and OHSAS18001 occupational health and safety management system certification.
Asked Questions
Q: What rules should be followed to properly use a duct fume hood?
Q: What three things should you check before using a duct fume hood?
Q: What precautions should be taken during duct fume hood?
Q: What is the minimum airflow for a duct fume hood?
Q: What is the osha standard for duct fume hoods?
Q: What not to do in a duct fume hood?
Q: How often should duct fume hoods be inspected?
Q: Which of the following should you not do when working in a duct fume hood?
Q: What ppe is required when using a duct fume hood?
Q: How many cfm for duct fume hood?
Q: How do you calculate the flow rate of a duct fume hood?
Q: Should duct fume hoods be open all the way?
Q: What should you do immediately before using a duct fume hood?
Before using a duct fume hood, make sure your work area is clean and uncluttered.
Never use the duct fume hood to store chemicals and equipment between procedures.
Verify the date on the inspection sticker on the duct fume hood. ...
The duct fume hood average face velocity should be between 80-150 feet per minute.
Q: What should be checked prior to using a duct fume hood?
Q: What is the minimum flow for a duct fume hood?
Q: What are the airflow requirements for a duct fume hood?
Q: Do duct fume hoods need to be certified?
Q: What is the life expectancy of a duct fume hood?
Q: How do you know if your duct fume hood is working properly?
Turn on hood.
Check the vaneometer. ...
Match the arrow on the hood sash with the arrow on the side panel of the hood.
To acquire reading, hold vaneometer in the center of the hood.
Acceptable standard -chemical duct fume hoods should operate at a face velocity of (80-120) linear feet per minute.
Q: What should you check for before using a duct fume hood?
Ensure users are properly trained.
Know the chemicals.
Ensure sash is opened to proper height.
Check the air gauge.
Ensure exhaust fan is working.
Keep spark sources away.
Check the air filters.
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