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E-mail
sales2@airs-tech.com
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Phone
18939760017
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Address
Room 703, Building 35, C2 International Zone, Lane 1555, Jinshajiang West Road, Jiading District, Shanghai
Anruis (Shanghai) Technology Co., Ltd
sales2@airs-tech.com
18939760017
Room 703, Building 35, C2 International Zone, Lane 1555, Jinshajiang West Road, Jiading District, Shanghai
A ductless clean air fume hood is a type of fume hood that does not require external ducts. It comes with a fan and filtration system. The clean air fume hood can be equipped with molecular filters, high-efficiency particle filters (HEPA), or a combination of both. The harmful gases or dust in the cabinet are filtered and the clean air is returned to the indoor environment for circulation. It does not discharge the processed indoor air and does not affect the balance of indoor HVAC. Therefore, it can achieve the effects of safety, environmental protection, and energy conservation. At the same time, because it does not require external pipelines, the site selection is flexible and the installation is convenient and fast, which has been chosen by many advanced experiments.
1. Choose the appropriate type
If it is a chemistry and physics experiment, then chooseClean air type fume hoodIf it is precision weighing, choose a balance weighing protective cover. If it is for placing large instruments, you can choose an Anruis clean air instrument protective cabinet. Although they are all clean air products, their design schemes vary for different experiments. Choosing the right one can achieve twice the result with half the effort.
2. Choose the appropriate size
Select the appropriate model based on the number of experimental personnel, instrument size, and laboratory space. The standard depth for a clean air fume hood is 750mm, and the length is 900-1300-1500-1800mm. Customization is available for special needs.
3. ShouldChoose a clean air type fume hood that meets relevant national standards and has been verified by a third-party independent organization;
1. Selection of filter model
According to the chemicals (solvents, acids, bases, gases, etc.) operated inside the fume hoodpowderFor example, different types of filters can be recommended, such as molecular filters for organic volatile compounds, inorganic acids, formaldehyde, ammonia, or comprehensive types, and HEPA filters for powders.
2. Filter configuration selection
According to the customer's daily needsUsage, operation time, frequency of use, and monthly working hours, as well asChemicalsMSDSRecommended filtering configurations based on PC-TWA values, such as single-layer, double-layer molecules, HEPA, or a combination of both,clean roomThere are specialized configurations available.
1. Real time face wind speed monitoring: The sensor should be selected in the correct position to truly reflect the face wind speed that protects the operator. When the wind speed is too low, too high, or the door is opened too much, corresponding alarms should be given;
2. Different air quality monitoring modules can be selected for the type of gas being operated, such as organic volatile Air-V, acid Air-A, formaldehyde Air-F (Anruis products can simultaneously select and display multiple monitoring modules), which is the most important means to determine whether the molecular filter is saturated and ensure user safety;
3. Filter differential pressure monitoring, which can reflectHEPA filterThe saturation level is an important indicator for determining whether a filter should be replaced.
4. The temperature and humidity monitoring module can monitor abnormal temperature and humidity inside the cabinet, and can promptly shut down the fan and issue an alarm.
Installation requirements:
1. Installation personnel should undergo manufacturer service training, familiarize themselves with installation processes and skills;
2. The installation of fume hoods should refer to the manufacturer's installation guidelines and choose a suitable location. Corresponding requirements have been made for the distance between windows, corridors, and air conditioning vents to reduce interference during use;
3. Before installation, it is necessary to check whether the site is suitable and determine the configuration of water and electricity,And communicate with users；
4. Pay attention to the protection or relocation of equipment and instruments on the customer's on-site countertop to avoid accidental damage;
5. According to the ventilation cabinet configuration list, check the quantity and install it;
6. Finally, clean the equipment and environment.
Verification after installation:
1. Set corresponding parameters according to the configuration of the fume hood;
2. Test the wind speed on the test surface and record it. If necessary, conduct testsOnline softwarecorrecting;
3. Concentration control detection of fume hood;
4. Leakage and efficiency detection of filters;
4. HEPA filters should undergo pressure loss testing, while 3Q filters should undergo downstream cleanliness testing;
5. Verification of surface wind speed alarm and other alarms.
During experimental operation
1. After the fan is started and running normally, move the chemicals required for the experiment into the fume hood;
2. Ensure that the face wind speed of the fume hood is always maintained within a safe range of 0.4 m/s to 0.6 m/s during operation. Excessive face wind speed may cause turbulence in the airflow, while insufficient face wind speed may prevent effective capture of pollutants;
3. Reagents should be taken as needed, avoiding prolonged open storage to reduce volatilization and extend the lifespan of the filter;
4. The sliding door must be lowered and kept closed during operation. Keep your arms inside the cabinet during operation, avoiding frequent and rapid movement of your arms to prevent interference with airflow;
5. Chemical containers should be placed at a depth of at least 15cm inside the cabinet, away from open areas.
6. If the experimental chemicals are inconsistent with the SVS content, the manufacturer should be consulted in a timely manner.
After experimental operation:
1. While keeping the fan running, organize the experimental equipment and clean the fume hood countertop;
2. Empty the reagent bottles from the fume hood and store them in a dedicated reagent cabinet;
3. After completing the cleaning and organization, carefully check and confirm that all water, gas, and power switches inside the cabinet are turned off. Close the front door and use the built-in delayed closing function of the fume hood to ensure that any harmful gases remaining inside the cabinet are fully filtered. After confirming everything is correct, you can leave.
1. The filter should be replaced promptly according to the alarm reminder of the air quality monitoring module or SVS timer;
2. The correct model of filter should be selected according to the manufacturer's recommendation;
3. If the molecular filter is not replaced in a timely manner after saturation, the downstream air quality will no longer be safe, directly threatening the safety and health of operators. When the HEPA filter is saturated, it will cause excessive pressure loss, reduce surface wind speed, and may cause pollutant particles to fall onto the experimental table with vertical airflow, cross contaminating the sample;
4The replacement should be carried out by professionals, and the filter leakage and efficiency test should be conducted after replacement;
5. After replacement, the old filter should be handed over to a specialized hazardous waste company for disposal by the user.