Particulates (pollen, fine dust from the street and from wear and tear (tires, clutches and breaks) as well as industrial dust from ambient air), soot and gases such as ozone, n-Butanes, Toluene, SO2, NOx, NH3 or acetaldehyde cause health, comfort and safety issues for drivers and passengers. The car, truck, construction equipment, agricultural vehicles, rail and aerospace markets have taken steps to create healthier cabin air environments by offering pollen and activated carbon combi filters:
- Combi filters from Technostat® filter media and activated carbon remove gaseous pollutants and odors and provide the market’s highest particulate efficiency – offering up to a 50% lower pressure drop versus standard cabin air filter media.
- H&V’s patented activated carbon combi filter media packs more surface area into each gram of carbon, good bonding and high adsorption capacity making it more effective.
Poor indoor air quality has been linked to many health issues including respiratory illness. H&V’s filtration technologies for residential appliances create healthy, clean, and safe home environments while using the least amount of energy.
- AlphaPerm® 100 % synthetic meltblown air filtration media offers 40% lower resistance compared to standard meltlbown media, and is highly charged, with excellent pleatability on backer, rotary and blade pleaters.
- H&V’s Technostat® appliance filter media offer 30% to 50% lower resistance at a specified efficiency than any technology available on the market. This makes it ideal for small-space applications that require high efficiency with very low resistance—the type required by pre- and post-vacuum cleaner and room air cleaner filter applications.
- Technostat’s filtration performance, stability, and durability are ideal for vacuum cleaner primary filters; the media’s extended charge-holding capability means longer filter life.
Respirators are personal air purifiers that protect wearers from inhaling hazardous air. H&V’s cutting-edge filter technology removes unhealthy dust particles, fumes, smoke, mist, organic vapors, and gases to ensure air is clean and safe.
- H&V’s new AlphaPerm® meltblown media provides 40% lower resistance versus standard meltblown.
- H&V’s Technostat® offers the lowest resistance on the market. Meltblown Technostat composites meet stringent U.S. government NIOSH and European EN 149 standards at 30 to 50% lower resistance than meltblown media alone.
- Technostat improves wearer comfort for respirators by creating a cooler temperature and better airflow.
Indoor air pollution is considered one of the top environmental health risks. HVAC air filters remove dust and other particles to ensure HVAC systems perform at peak efficiency and deliver quality indoor air. H&V offers a variety of highly engineered media that meet or exceed different global standards and offer lower pressure drop, energy savings, and longer media life.
- Our HVAC filter media, glass or 100% synthetic, achieve the desirable combination of high filtration efficiency with low pressure drop.
- Our patented NanoWave® HVAC pocket media provide superior dust-holding capacity compared to traditional
synthetic media and glass mat.
Gas turbine filtration and dust collection systems operate in the most challenging environments imaginable. They require high service intervals and durability against airborne contaminants found in adverse conditions throughout the world. H&V offers the broadest range of pulse-cleaned and static high-performance filter media that set the standard for efficiency and extended life in the toughest environments.
- Patented NANOWEB® media offers 500% higher service intervals for pulsed cartridge applications compared to non-fine fiber treated media. Our media offers the ability to fine-tune filter change intervals to match up to your other maintenance timelines.
- Our market-leading corrugation capabilities (> 20 mils) offer superior dust-holding capacity for lower-cost, higher-service interval filter designs.
A cleanroom is a controlled environment used for highly sensitive manufacturing and production operations. The level of cleanliness in a cleanroom is defined by the allowable concentration of airborne particles, with other environmental parameters (e.g. temperature, air pressure, and humidity) controlled as necessary for any given process. Achieving and maintaining the level of cleanliness needed for these sensitive applications necessitates the use of innovative particulate filtration technology (HEPA and ULPA). In addition to airborne particles, airborne molecular contamination is an increasingly important driver of process performance, requiring molecular or gas phase filtration media.
For advanced materials, you can trust in your most critical filtration applications, turn to the experts at Hollingsworth & Vose (H&V). We manufacture highly engineered HEPA and ULPA particulate filter media as well as molecular filter media (MFM). H&V’s materials help control contamination, ensuring process integrity and optimizing process yields. H&V’s differentiated solutions reducing the energy consumption of cleanroom filtration systems, a significant portion of overall cleanroom costs. All of our filtration products are designed and constructed to meet the most stringent requirements of all relevant international standards.
The Role of Filtration Systems in Cleanrooms
The filtration system is the critical component in any cleanroom, as it keeps the cleanroom free of contaminants that threaten the quality, safety, and yield of the process being protected. A cleanroom filtration system uses multiple filters to remove and collect particles from incoming air. The flow of air in a cleanroom is carefully engineered to facilitate the control of airborne contamination by ensuring air moves in a single direction (laminar or unidirectional). This airflow design minimizes the risk of contaminants traveling through and landing inside of the cleanroom rather than getting processed by the filters.
HEPA Filters for Cleanrooms
HEPA filters are one of the most commonly used types of cleanroom filters. They can filter out 99.99% of all particles that are 0.3 µm or bigger, which enables them to capture and collect many of the contaminants from the air going into a cleanroom.
What Role Do HEPA and ULPA Filters Play in Cleanroom Settings?
In cleanrooms, an HVAC system first heats or cools and humidifies or dehumidifies the incoming air as needed. It then passes the air through a series of terminal HEPA or ULPA filters, which remove any microscopic particles that it might be carrying. This comprehensive process ensures the air is appropriate for the operations performed within the cleanroom, including temperature, moisture, and contaminant levels.
How Do HEPA Filters Work?
HEPA filters capture and collect airborne particulates through the use of a complex fiber web. The web traps contaminants by sieving, interception, diffusion, or inertial impaction, depending on the particulate’s size. Small-sized particles dissipate as they travel through the web until they collide with and become trapped by a fiber. Medium-sized particles are trapped through interception. Large-sized particles are trapped through inertial impaction and sieving.
Configuration of Cleanroom Filters
The filter product configurations used to depend on the requirements and restrictions of the particular application. They can include filter panels, compact filters, and deep-pleat filters. These products are processed using a variety of techniques, such as knife pleating, deep pleating using aluminum separators, and rotary mini-pleating. H&V has significant experience working with all major manufacturers of pleating equipment and can advise customers on best practices for any given application.
Types of Cleanroom HEPA Filters
Cleanroom HEPA filters come in many designs and configurations to suit different filtration applications. The most common include:
- Fan-powered HEPA filters. These filters are highly flexible and easy to install. Standard ones offer variable speed control and feature power indicator lights.
- Terminal diffusers. These filters are designed to be hung from tee-bar ceilings to encourage unidirectional airflow.
- Low-profiled HEPA filters. These filters are ideal for applications where a standard-sized filter would be difficult or impossible to install.
HEPA Filters for Cleanrooms by H&V
At H&V, all of our high-efficiency cleanroom filters are constructed with low boron content and engineered for superior performance (high strength, low pressure drop). Our product selection includes:
- Standard glass media: suitable for mini-pleat, deep-pleat, and compact filter processing
- Perform glass media: offers superior processing characteristics and a 10% to 16% lower pressure drop compared to competitive media with the same efficiency
- Molecular filtration media (MFM): addresses airborne molecular contamination, which can threaten process yields in many cleanroom applications
We’ve also created laminated structures that combine different technologies to enhance specific performance characteristics. To learn more about our filtration media products and how they can benefit your cleanroom application, contact us today.