Friday, September 25, 2009

Why Go For Ductless Fume Hoods?

Ductless fume hoods or conventional chemical fume hoods? Why nowadays most people in the industries choose ductless fume hoods? Any problems with conventional chemical fume hoods? The answers are here. There are some advantages to use ductless fume hoods compare with the conventional fume hoods. Read more to know why ductless fume hoods become famous and first choice in the industries.

Ductless fume hoods are a portable unit. There is no connection to the building structure beside the power cord. It is easy to move or relocate your ductless fume hoods to any place that you want. It is easy to shift the ductless fume hoods from room to room to fulfill your current needs. This type of fume hoods can be moved easily and operational in minutes by yourself. No third party needed.

To compare ductless fume hoods with conventional chemical fume hoods, the conventional types have a ducting. The ducting connected to the building exhaust system. It is not a mobile or portable unit. To relocate or shift the conventional chemical fume hoods is not easy. You cannot do it yourself. You need third party or contractors to move the fume hoods to other location. It needs time and proper planning especially when to design the new ducting layout and also doing new ducting installation. The new location must be accessible to the building exhaust system. That is why people in the industries prefer ductless fume hoods.

In term of cost, ductless fume hoods is cheaper compare with conventional chemical fume hoods. The operation and installation cost of ductless fume hoods (also known as HVAC-free fume hoods) is substantially lower than that of a conventional fume hoods. No cost for ducting installation for ductless fume hoods. No building exhaust fan connection needed. No blower need to purchase. See, how much we can save by using ductless fume hoods.

Ductless fume hoods are not required any complicated installation. Basically, they are shipped and ready to use. Just simply remove from the shipping container and placed it at your service room. Each unit of ductless fume hoods has been regulated and certified for operation immediately. What other cost incurred for the ductless fume hoods? Very minimum. Once the ductless fume hoods installed, the cost that you need to bare is the filters replacement. It cost you approximately from $300 to $2000 per year.

Ductless fume hoods also do not affect the cost of heating and cooling like the conventional chemical fume hoods operation process. For conventional fume hoods cabinet, heated and cooled air is pumped out of the room into the environment via exhaust system. The exhausted air is then replaced by outside air that needs to be heated or cooled and cleaned. All these need money to run the process.

Most ductless fume hoods in the market have an advanced monitoring system (advisable to get this type of ductless fume hoods). This unit type installed with automatic controller to monitor airflow and filter condition constantly to ensure the safety of the operators. Each unit of ductless fume hoods has a solid state gas detector. Its function is to monitor the carbon filter bed for saturation. The ductless fume hoods are also installed with alarms that audible and visible to alert the operators of filter saturation. The alarms already set per current ACGIH standards for TLV of known chemicals. State-of-the-art airflow sensor takes a constant reading of face velocity. Then, it will provides information in linear feet per minute (LFM) on the LCD monitor screen that the operators easily can monitor. So, ductless fume hoods are safe for you.

If we want to talk about environmental friendly, ductless fume hoods is the best option to choose. This is because ductless fume hoods do not release the fumes or vapors to the environment. All cleaning process is only in the room. Ductless fume hoods recycle existing room air while cleaning the chemical mixture. Once the bonded carbon filter saturated, it can safely disposed of in a landfill. For the conventional chemical fume hoods, the room air will be processed in the room and release to the environment. This process may release the air together with the harmful fumes and vapors which will harm the environment. So, ductless fume hoods are the best for the environment.

Ductless fume hoods are the best option for the industries compare with the conventional chemical fume hoods. Even though not all application is appropriate to use the ductless fume hoods, the manufacturers from time to time increasing their product to fulfill customer requirement and needs. Choose the best ductless fume hoods that suitable with your procedures.

P.S : Above picture of ductless fume hoods are manufactured by Esco Technologies, a trusted and experienced manufacturer of ductless fume hoods, since 1978.

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AMAZING!!.. Ductless Fume Hoods Works

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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