What are Laboratory Fume Hoods Special Functons of Fume Cupboard Suppliers ?
Laboratory ventilation disign requirements of comfort air conditioning systems. Their primary purpose is to provide a safe and comfortable working environment and reduce laboratory personnel's exposure to hazardous environments. Fume hoods primarily address the work environment, health, and labor protection of laboratory personnel.
I. Types of Fume Cupboards
Building a modern laboratory is a systematic project. When equipping the laboratory with various instruments and equipment and their supporting facilities, it is necessary to consider power supply, water supply, drainage, air supply, exhaust, purification, and sewage disposal. Furthermore, attention must be paid to the safety of personnel, objects, and the surrounding environment; the comfort of the noise, odor, and visual environment; the operability and functionality of various laboratory equipment; and the convenience of information processing. Therefore, a modern laboratory must be designed and equipped with high-quality equipment to meet these requirements. Modern laboratory equipment includes: fume hoods, central lab benches, side benches, medicine cabinets, instrument cabinets, and gas cylinder cabinets. Fume hoods play a crucial role in biochemical laboratories and are essential equipment. Therefore, Fume Cupboard Suppliers must select high-quality fume hoods for clients using.
Fume hood suppliers categorize fume hood exhaust systems into three types: top exhaust, bottom exhaust, and top and bottom exhaust. To ensure uniform air velocity in the laboratory personnel's workspace, bottom exhaust should be selected for cooling processes, while top exhaust should be selected for heating processes. For processes with unstable heat generation, exhaust vents should be installed on both the top and bottom, adjusting the ratio of top and bottom exhaust volume as the heat generation inside the hood fluctuates, thereby achieving uniform air velocity.
Fume hoods can also be classified into three types based on their air intake method. Full exhaust fume hoods, which draw in indoor air, circulate it through the hood, and then exhaust it outdoors, are a very common type. When the fume hood is installed in a heated room or a room with temperature and humidity control requirements, a makeup air fume hood uses outdoor makeup air that circulates through the hood before exhausting outdoors to save heating and air conditioning energy. The second type of fume hood is a variable air volume control system. Conventional constant air volume systems require manual adjustment of a fixed-blade damper to adjust the fume hood's exhaust volume. When the damper is adjusted to a certain angle, the desired face velocity is achieved. Variable air volume control (VAV) uses a sensor to adjust the air volume to achieve a given face velocity. Standard fume hoods are low-cost, while variable air volume (VAV) fume hoods are more expensive. These fume hoods are suitable for laboratories requiring high precision and research labs.
Fume Cupboard Suppliers offer a wide range of styles, including monolithic, open-bottom, floor-standing, two-sided, three-sided glass, tabletop, and one-piece, depending on their intended use. They also offer custom designs tailored to specific experimental requirements, such as those for radioactive, synthetic, and perchloric acid experiments.
II. Main Functions of Fume Cupboard
Fume cupboards suppliers think that the main function of a fume hood is exhaust. In chemical laboratories, experiments generate various harmful gases, odors, moisture, and flammable, explosive, and corrosive substances. To protect laboratory personnel and prevent the spread of contaminants, these experiments require the use of fume hoods.
In the past, fume hoods were used in limited numbers, reserved for experiments involving particularly harmful and hazardous gases and those generating significant amounts of heat. Fume hoods served only as auxiliary equipment for the laboratory bench. In recent years, in order to improve the experimental environment, experiments conducted on the laboratory bench have gradually been transferred to fume hoods. This requires that fume hoods be selected more frequently when building modern laboratories and high-tech laboratories to ensure the safety of experimental personnel. The purpose of selecting a fume hood is to exhaust the harmful gases generated in the experiment and protect the health of experimental personnel. The fume hood should have a high degree of safety and excellent operability, which requires the fume hood to have the following functions:
(1) Release function: It should be able to absorb the harmful gases generated inside the fume hood by absorbing the gas outside the cabinet, dilute it, and then discharge it to the outside after treatment to meet environmental protection requirements before discharging it into the atmosphere.
(2) No backflow function: It should have the function of preventing the airflow generated by the exhaust fan inside the fume hood from flowing back into the room. To ensure the realization of this function, the best method is to connect a fume hood with a fan and an electric damper with a single pipe. If it cannot be connected with a single pipe, it can only be connected in parallel in the same room on the same floor. The fan should be installed at the end of the pipe (or on the roof) as much as possible.
(3) Isolation function: A glass (acrylic) window should be used in front of the fume hood to separate the inside and outside of the fume hood.
(4) Air supply function: The fume hood should have a channel or alternative device to inhale air from outside the fume hood when exhausting harmful gases.
(5) Wind speed control function: In order to prevent harmful gases from escaping from the fume hood, the fume hood supplier will control the fume hood's suction speed according to the requirements of each experiment in the fume hood. The factors that determine the suction speed of the fume hood's air intake are: the heat generated by the experimental content and the relationship with the number of air changes. The main factors are the experimental content and the nature of the harmful substances. It is generally stipulated that the suction speed of generally non-toxic pollutants is 0.25-0.38m/s, the suction speed of toxic or dangerous harmful substances is 0.4-0.5m/s, the suction speed of highly toxic or slightly radioactive substances is 0.5-0.6m/s, the suction speed of gaseous substances is 0.5m/s, and the suction speed of granular substances is 1m/s. In order to ensure that the wind speed meets the requirements, the fume hood fan should have the necessary static pressure, that is, the friction resistance when the air passes through the ventilation duct. When determining the wind speed, attention should also be paid to the noise problem. When air flows through the pipe, the limit is 7-10m. If it exceeds 10m, noise will be generated. Usually, the noise limit value of the laboratory (indoor background noise level) is 70dB(A). Increasing the pipe cutting area will reduce the wind speed, which will also reduce the noise. Considering the cost and construction issues of the pipe, the power of the pipe and exhaust fan must be carefully selected.
(6) Heat resistance and acid and alkali corrosion resistance: Some fume hoods need to be equipped with electric furnaces, and some experiments produce a large amount of acid, alkali and other toxic and harmful gases with strong corrosiveness. The table, lining, side panels and selected water nozzles and gas nozzles of the fume hood should have very strong anti-corrosion function.
III. Gas emission disposal of Fume Cupboards
The laboratory emits many toxic and acid-base corrosive gases, so the gas must be treated before being discharged into the atmosphere. The treatment method is as follows: A vertical acid mist tower is used for acidic gases; an optical catalytic purification box is used for toxic and organic gases. The two devices are installed at the end of the exhaust system: the vertical acid mist tower is located in the positive pressure section of the fan, and the optical catalytic purification box is located in the negative pressure section. After primary and secondary filtration, the air from the animal room is discharged directly into the atmosphere. However, it is treated with a high-pressure jet at the exhaust outlet, with the jet spray reaching a height of more than 3 meters.
!!!Choose SUCLAB Fume
Cupboard, Choose the Professional Lab Fume Cupboard Supplier!!!
Welcome to send us your enquiry or contact us for more products information.
Look forward to serving you!!
What are Laboratory Fume Hoods Special Functons of Fume Cupboard Suppliers ?
Laboratory ventilation disign requirements of comfort air conditioning systems. Their primary purpose is to provide a safe and comfortable working environment and reduce laboratory personnel's exposure to hazardous environments. Fume hoods primarily address the work environment, health, and labor protection of laboratory personnel.
I. Types of Fume Cupboards
Building a modern laboratory is a systematic project. When equipping the laboratory with various instruments and equipment and their supporting facilities, it is necessary to consider power supply, water supply, drainage, air supply, exhaust, purification, and sewage disposal. Furthermore, attention must be paid to the safety of personnel, objects, and the surrounding environment; the comfort of the noise, odor, and visual environment; the operability and functionality of various laboratory equipment; and the convenience of information processing. Therefore, a modern laboratory must be designed and equipped with high-quality equipment to meet these requirements. Modern laboratory equipment includes: fume hoods, central lab benches, side benches, medicine cabinets, instrument cabinets, and gas cylinder cabinets. Fume hoods play a crucial role in biochemical laboratories and are essential equipment. Therefore, Fume Cupboard Suppliers must select high-quality fume hoods for clients using.
Fume hood suppliers categorize fume hood exhaust systems into three types: top exhaust, bottom exhaust, and top and bottom exhaust. To ensure uniform air velocity in the laboratory personnel's workspace, bottom exhaust should be selected for cooling processes, while top exhaust should be selected for heating processes. For processes with unstable heat generation, exhaust vents should be installed on both the top and bottom, adjusting the ratio of top and bottom exhaust volume as the heat generation inside the hood fluctuates, thereby achieving uniform air velocity.
Fume hoods can also be classified into three types based on their air intake method. Full exhaust fume hoods, which draw in indoor air, circulate it through the hood, and then exhaust it outdoors, are a very common type. When the fume hood is installed in a heated room or a room with temperature and humidity control requirements, a makeup air fume hood uses outdoor makeup air that circulates through the hood before exhausting outdoors to save heating and air conditioning energy. The second type of fume hood is a variable air volume control system. Conventional constant air volume systems require manual adjustment of a fixed-blade damper to adjust the fume hood's exhaust volume. When the damper is adjusted to a certain angle, the desired face velocity is achieved. Variable air volume control (VAV) uses a sensor to adjust the air volume to achieve a given face velocity. Standard fume hoods are low-cost, while variable air volume (VAV) fume hoods are more expensive. These fume hoods are suitable for laboratories requiring high precision and research labs.
Fume Cupboard Suppliers offer a wide range of styles, including monolithic, open-bottom, floor-standing, two-sided, three-sided glass, tabletop, and one-piece, depending on their intended use. They also offer custom designs tailored to specific experimental requirements, such as those for radioactive, synthetic, and perchloric acid experiments.
II. Main Functions of Fume Cupboard
Fume cupboards suppliers think that the main function of a fume hood is exhaust. In chemical laboratories, experiments generate various harmful gases, odors, moisture, and flammable, explosive, and corrosive substances. To protect laboratory personnel and prevent the spread of contaminants, these experiments require the use of fume hoods.
In the past, fume hoods were used in limited numbers, reserved for experiments involving particularly harmful and hazardous gases and those generating significant amounts of heat. Fume hoods served only as auxiliary equipment for the laboratory bench. In recent years, in order to improve the experimental environment, experiments conducted on the laboratory bench have gradually been transferred to fume hoods. This requires that fume hoods be selected more frequently when building modern laboratories and high-tech laboratories to ensure the safety of experimental personnel. The purpose of selecting a fume hood is to exhaust the harmful gases generated in the experiment and protect the health of experimental personnel. The fume hood should have a high degree of safety and excellent operability, which requires the fume hood to have the following functions:
(1) Release function: It should be able to absorb the harmful gases generated inside the fume hood by absorbing the gas outside the cabinet, dilute it, and then discharge it to the outside after treatment to meet environmental protection requirements before discharging it into the atmosphere.
(2) No backflow function: It should have the function of preventing the airflow generated by the exhaust fan inside the fume hood from flowing back into the room. To ensure the realization of this function, the best method is to connect a fume hood with a fan and an electric damper with a single pipe. If it cannot be connected with a single pipe, it can only be connected in parallel in the same room on the same floor. The fan should be installed at the end of the pipe (or on the roof) as much as possible.
(3) Isolation function: A glass (acrylic) window should be used in front of the fume hood to separate the inside and outside of the fume hood.
(4) Air supply function: The fume hood should have a channel or alternative device to inhale air from outside the fume hood when exhausting harmful gases.
(5) Wind speed control function: In order to prevent harmful gases from escaping from the fume hood, the fume hood supplier will control the fume hood's suction speed according to the requirements of each experiment in the fume hood. The factors that determine the suction speed of the fume hood's air intake are: the heat generated by the experimental content and the relationship with the number of air changes. The main factors are the experimental content and the nature of the harmful substances. It is generally stipulated that the suction speed of generally non-toxic pollutants is 0.25-0.38m/s, the suction speed of toxic or dangerous harmful substances is 0.4-0.5m/s, the suction speed of highly toxic or slightly radioactive substances is 0.5-0.6m/s, the suction speed of gaseous substances is 0.5m/s, and the suction speed of granular substances is 1m/s. In order to ensure that the wind speed meets the requirements, the fume hood fan should have the necessary static pressure, that is, the friction resistance when the air passes through the ventilation duct. When determining the wind speed, attention should also be paid to the noise problem. When air flows through the pipe, the limit is 7-10m. If it exceeds 10m, noise will be generated. Usually, the noise limit value of the laboratory (indoor background noise level) is 70dB(A). Increasing the pipe cutting area will reduce the wind speed, which will also reduce the noise. Considering the cost and construction issues of the pipe, the power of the pipe and exhaust fan must be carefully selected.
(6) Heat resistance and acid and alkali corrosion resistance: Some fume hoods need to be equipped with electric furnaces, and some experiments produce a large amount of acid, alkali and other toxic and harmful gases with strong corrosiveness. The table, lining, side panels and selected water nozzles and gas nozzles of the fume hood should have very strong anti-corrosion function.
III. Gas emission disposal of Fume Cupboards
The laboratory emits many toxic and acid-base corrosive gases, so the gas must be treated before being discharged into the atmosphere. The treatment method is as follows: A vertical acid mist tower is used for acidic gases; an optical catalytic purification box is used for toxic and organic gases. The two devices are installed at the end of the exhaust system: the vertical acid mist tower is located in the positive pressure section of the fan, and the optical catalytic purification box is located in the negative pressure section. After primary and secondary filtration, the air from the animal room is discharged directly into the atmosphere. However, it is treated with a high-pressure jet at the exhaust outlet, with the jet spray reaching a height of more than 3 meters.
!!!Choose SUCLAB Fume
Cupboard, Choose the Professional Lab Fume Cupboard Supplier!!!
Welcome to send us your enquiry or contact us for more products information.
Look forward to serving you!!
