Brands |
N/A AAF AstroCel® Flanders® |
Industry Standards/Certifications |
N/A IEST-RP-CC007 (Institute of Environmental Sciences and Technology) UL 586 (Underwriters Laboratories) Classified UL 900 (Underwriters Laboratories) Classified |
Mini-Pleat Media Pack |
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Space Saving Media Pack |
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Designed to combine maximum efficiency with low pressure drop, the pleated media pack is available in sizes from 2" to 4" deep. Our compact size results from a mini-pleat filter design that reduces resistance and provides the lowest possible pressure drop. Ribbons of media spaced every 1 1/4" maintain separation of pleats within the pack, while allowing a more compact filter depth than corrugated separators. The separation and precision straightness of the pleats allow air to move throughout the entire depth of the filter, utilizing the full cleaning potential of the media. |
Sturdy Construction |
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Manufactured from borosilicate microfibers, AstroCel® II filter glass media water resistant and fire-retardant. The media pack is permanently attached to an anodized extruded aluminum frame with a UL classified, urethane adhesive. Frames are available with gasket seal, gel seal, or knife-edge seal for fluid seal grid applications. The AstroCel® II LPD Series filter with knife-edge cell sides was designed specifically for gel seal grid systems. |
Lowest Possible Pressure Drop |
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Because of the relatively large volumes of air handled in a typical cleanroom application, operating cost is a prime consideration in the design of the air filtration system. One of the most important areas to be evaluated is the resistance or pressure drop across the HEPA filters, because fan horsepower is the single biggest energy consumer in the cleanroom. Pressure drop is measured by manometer as the test filter is subjected to a metered air volume. Testing on a volumetric basis is specified in the Institute of Environmental Sciences and Technology IEST-RP-CC007 standard on ULPA filters. AAF Flanders® calculates the total square footage of usable media pack area (outside dimensions of filter minus the frame thickness and adhesive) and multiplies this number by 100 FPM to determine an accurate volumetric test flow. This method simulates actual cleanroom airflow conditions, ensuring a true measurement of pressure drop. Some manufacturers determine the test flow by measuring the velocity (100 FPM) at one or two points on the downstream side of the filter by using an anemometer. This procedure assumes the airflow is uniformly 2" from the downstream side of the filter, and in the majority of cases the assumed test flow will be less than 550 CFM for a nominal 24" x 48" filter. Since reduced operating pressure drop is so important, volumetric testing as performed by AAF Flanders® is essential to determining true pressure drop and its impact on your cleanroom costs. |
Ongoing Quality Control |
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Process control starts with sample flats of each roll of media tested for efficiency, using either a Q-127 penetrometer (HEPA media) or a Condensation Nucleus Counter (ULPA and above.) The media is also tested for thickness, basis weight, tensile strength, binder content, water repellency, and pressure drop. Once a roll meets our specifications, it is carefully pleated and assembled in the cell side designed for the specific application. The filter is then tested and certified to meet the designated efficiency requirement. If required by the customer specification, the filter is tested for pinhole leaks. A final visual inspection ensures that dimensional tolerances have been met. Every filter is identified by serial and order number and is labeled with performance criteria, media lot number, operator number, and part number. Meticulous scrutiny during every phase of the production process enables AAF Flanders® to trace a filter back to the roll of media from which it was manufactured, should a defect be identified. This elaborate testing ensures that you receive only the highest quality cleanroom filtration products, resulting in cost effective products that meet your toughest requirements. |
State-of-the-Art Testing |
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AAF Flanders® has established an air filtration testing methodology that is among the most comprehensive and accurate in the industry. Testing is essential in documenting filter efficiency and assisting in research and development of filtration products. AAF Flanders® testing facilities meet the highest standards for quality control. Every HEPA and ULPA filter is tested and certified, using procedures tailored to your specifications, to meet your performance requirements prior to shipping. AAF Flanders® testing procedures for overall efficiency include laser particle counters with liquid or solid aerosol challenge. Pinhole leaks can be detected using either AAF Flanders® proprietary static scan test, hand, or automatic scan testing. |
Performance Data |
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 AstroCel®II LPD Series High Efficiency Particulate Air (HEPA) - Performance Data  AstroCel®II LPD Series Ultra-Low Particulate Air (ULPA) Filters - Performance Data |
Additional Information |
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The AAF Flanders® AstroCel® II LPD Series is a unique family of mini-pleat HEPA and ULPA filters designed to meet the demanding airflow and efficiency requirements of the semiconductor, pharmaceutical, biotech, food processing, and other industries in which airborne contaminants must be carefully controlled. AstroCel® II filters combine the right features to give you optimum efficiency while keeping operating costs to a minimum. With 2", 3", or 4" deep media packs, the AstroCel® II mini-pleat filter design reduces resistance and provides the lowest possible pressure drop. Ribbons of media maintain pleat separation within the pack, while allowing a more compact filter depth than corrugated separators. The media pack is bonded to the sides of the extruded aluminum frame with urethane adhesive, forming an airtight seal. AstroCel® II microglass media is water resistant and fire retardant. AstroCel® II filters are scan tested at 99.99 % efficiency with a non-DOP aerosol to ensure the filter is free from pinhole leaks. Also available is an ULPA (Ultra Low Penetration Air) model, which is additionally laser tested to 99.9995 % at 0.10-0.20 µm. |
Creative thinking may mean simply the realization that there’s no particular virtue in doing things the way they always have been done
~Rudolf Flesch
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