Yes,.. it's amazing!! If you look at how ductless fume hoods works, it is really amazing. It can filter at 0.3 microns size of particles from the air. Just imagine how ductless fume hoods efficiency to clean the environment in your work area. That is why ductless fume hoods are so important especially for those industries that really need clean working environment. The Laboratory, Medical, Sterile Assembly, Pharmaceutical, Manufacturing and Industrial facilities need ductless fume hoods to clean the air in the rooms. The fume hoods will purify the air in the rooms and will re-circulate back the purified air into the room. This process will continuously take place as required during operation within the work area.
In the industries, ductless fume hoods are equipped with HEPA Filters and Activated Carbon Filters to run the process of air purifying. It will provide air purification to the lab. What are HEPA filters and how important HEPA filters to the function of ductless fume hoods? HEPA stand for High Efficiency Particulate Air. The standard HEPA filters can filter 99.97% at 0.3 microns of size particles from the air. So, HEPA filters with Activated Carbon Filters in ductless fume hoods functioning as fumes, vapors and particles removal.
The standard HEPA filters used in the ductless fume hoods industries are rated by the ability to retain the particles of 0.3 microns in size. It will be tested with Poly Alpha Olefin (PAO). HEPA filters attached with a thin pleated sheet of boron silicate micro-fibers with aluminum separators. It is particulate filters which will retain airborne particles and microorganisms (gases pass freely trough). Filtration process in the ductless fume hoods occurs by five distinct methods or five primary mechanisms which are sedimentation, electrostatic attraction, interception, inertial impaction and diffusion.
For those industries that need particle-free work areas, ductless fume hoods are designed for it. It will increase the productivity as it preventing the product or process from contaminants introduced by many sources like from the equipment itself, personnel or from the product. Despite ductless fume hoods are not a substitute for efficient aseptic technique, it does help to ensure sterility when used properly.
There are two basic categories of ductless fume hoods in the market. We categorized the ductless fume hoods base on the air stream, either the air stream come from horizontal or vertical. So, we called horizontal flow hoods and vertical flow hoods. Both types of ductless fume hoods offer same degree of product protection by a constant flow filtered air in the room. For applications where the process generates vapors, solvents, chemicals or other fine powders, vertical flow hoods are recommended to be used in the lab. In certain cases when noxious fumes are being used, vertical flow exhaust hood will be utilized. Either fume hoods floor designed or table top mounted designed will be chosen for the lab is base on the space availability.
For the horizontal designed of ductless fume hoods, the filtered air flows in the fume hoods are parallel to the work surface that toward the operators. So, this type of flow hoods only provides product protection. Cell culture work, which falls into low risk categories (e.g., Medical Research Council Level A) required the horizontal flow hoods as their procedures.
Anything beyond the low risk level, a vertical flow hoods safety cabinet is a necessity. The vertical ductless fume hoods are designed to provide the ideal clean-air environment, particle-free and bacteria-free within the work place as required for laboratory work, manufacturing industries, testing, inspection or pharmaceutical procedures. It is not only clean the air, but also protect the products, personnel and the environment.
In the market, there are wide ranges of ductless fume hoods that provide a particle-free Class 100 (ISO 5) to the environment of work place. This is the important function of HEPA filter in the ductless fume hoods to protect products in Class 100 (US Fed Std 209E). Choose your ideal ductless fume hoods wisely that ideal with your lab and suitable function for your operation.
P.S : The above picture shows how ductless fume hoods works, air sucked into the ductless fume hoods and re-circulate clean air into the working area.
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