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  • HEPA Filters: What is Yours Actually Doing?
    It is common knowledge that to have a clean environment inside a biosafety cabinet or clean bench, you have to have HEPA-filtered air. Presumably, the filter removes all contaminants, but does it really? How does a HEPA filter work? Are all HEPA filters created equal?
  • Handling, Installation and Burn-off Procedure for HEPA Filters
    HEPA Filter = High Efficiency Particulate Air Filter. High means 99.97% or higher. The efficiency is a measure of how effectively the filter traps particles. It is calculated by dividing the number of particles trapped by the total number impinging on the filter. Fewer than 3 in 10,000 are allowed
  • How Long Do HEPA Filters Last?
    The life of a HEPA filter for a Biological Safety Cabinet (BSC) is an important subject when considering the life cycle cost of any BSC. HEPA filter loading capacity has always been a major concern for the design/performance of a BSC. Not only in terms of replacement cost, but also laboratory
  • Biosafety Cabinet HEPA Filter Replacements: Reducing Costs
    When selecting which biosafety cabinet is right for you, price is almost always a top consideration. While sticker price seems like the most pertinent cost data, you need to consider the total cost of ownership to get a true picture of the financial impact of your purchase.
  • Free software designs better aluminum structures
    For one-off designs of simple, aluminum structures such as guards and machine frames, it may be easy to sketch and list BOMs manually or with standard CAD tools. A fume hood, designed in MGEsoft, can accept a HEPA filter to provide laminar flow, or users can supply the model with exhaust flanges
  • MICRO: Defect/Yield Analysis - Kumar (January 2001)
    cleanrooms. The outgassing of these compounds from HEPA or ULPA filter polyurethane material (also known as potting compounds) has disrupted processing at several semiconductor facilities. Potting compounds are used to seal the edges of the pleated filter media to HEPA and ULPA filter housings
  • Improving Energy Efficiency in Pharmaceutical Manufacturing Operations Part II: HVAC, Boilers and Cogeneration
    and efficiency. High Efficiency Particulate Air (HEPA) filters and Ultra Low Penetration Air (ULPA) filters are commonly used in the pharmaceutical industry to filter make-up and recirculated air. The adoption of alternative filter technologies might allow for lower energy consumption. For example, new
  • MICRO:Extreme Silicon by Michael G. Harrison p.83 (June '99)
    particles moving through the HEPA and ULPA filters in cleanroom and minienvironment air supplies rub against the filter media, they generate a triboelectric surface charge. These charged particles are then attracted to surfaces with the opposite charge, which can quickly cause process equipment, wafer

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