HEPA and ULPA filters are a standard in many industries for work that requires an environment free of biological contaminants.
Comprised of a dense mat of randomly-arranged fibers, both HEPA and ULPA filters work in the same way. HEPA filters are 99.99% efficient for trapping particulates down to 0.3 μm, and ULPA filters provide 99.999% efficiency for particle sizes between 0.1 to 0.3 μm.
Laminar Flow Hoods: Addressing Challenges to HEPA/ULPA Filtration
The highest quality filtration media cannot overcome a poorly designed laminar flow hood that does little to support and optimize the filter's purpose. Some air filtration units present limitations including:
- Costly HEPA/ULPA filters become too quickly obstructed by large particulates and require frequent replacement
- Insufficient or uneven airflow through the filter results in limited air filtration capabilities
- Inability to properly monitor current particulate density causes premature filter replacement timelines
How Do Air Science's Vertical and Horizontal Laminar Flow Cabinets Address These Issues?
Problem: Costly HEPA/ULPA filters become too quickly obstructed by large particulates and require frequent replacement
Air Science's Solution: Each Air Science laminar flow cabinet includes an electrostatic pre-filter for trapping larger particulates that can accelerate the saturation of HEPA/ULPA filters. Pre-filters are easy to replace even while the cabinet is operating. Using pre-filters extends HEPA/ULPA filter life and maintains filter efficiency.
Problem: Insufficient air flow through the filter results in limited air filtration capabilities
Air Science's Solution: Purair Laminar Flow Cabinets maintain a 70-90 fpm (0.35-0.45 m/s) airflow velocity, measured 6"/150 mm from the filter with a uniformity of +/- 20% across the filter face.
Problem: Inability to properly monitor filter's current particulate density causes improper filter replacement timing
Air Science's Solution: All Air Science laminar flow cabinets have a factory-installed pressure gauge to confirm filter performance. This gauge accurately measures airflow pressure through the filter and minimizes the potential for insufficient filtration.