Pathogen Barrier Filters


Camfil PathogenBarrier Filters
Camfil PathogenBarrier filters provide lab and field tested proven performance in the prevention of aerosol transmission of viruses including PRRS. The advanced engineering behind this energy star media, designed with a fiber structure, makes it possible to achieve the highest possible airflow while maintaining filtration efficiency throughout the life of the filter.


03 04 Radial Inlet & Outlet

The unique curved form of the air inlet and outlet, a key component in achieving the highest airflow, provides greater open area than any other V-shaped filter. This results in less resistance to air flow, 30% more open area on the filter inlet and 60% more open area on the outlet than traditional V-style filters.


05 06 Media Packs

The media packs utilize a newly developed height-to-pleat spacing ratio that works in conjunction with the radial inlet and outlet to minimize resistance and maximize air flow. The pleat separators ensure pleat stability to provide continual low energy usage performance.


0708 5-Star Performance

The PathogenBarrier Filter is rated as a 5-Star filter through the Energy Cost Index (EIC) program. Based upon a five-star scale, the Energy Cost Index is an indicator of how a filter will perform over time. The best rating, 5-Stars, maintains its efficiency over its life and uses less energy to move air through the filter and is the most energy-efficient, longest-lasting filter available.


09 10 Easy Handling

The handles incorporated in the frame allow for ease of handling and prevents damage to the filter media.


11 12 Built-In Prefilter Space Section

Eliminates blockage of airflow and resultant high pressure drop when a prefilter is mounted directly to the face of the filter. While this problem is common in all V-style filters, the problem has been solved through advanced design engineering.


13 14 Pack Sealing

The pack sealing flanges molded into the frame eliminate bypass seen with standard V-filter construction.


Optional Added Protection

As an option, PathogenBarrier filters are available with an external, powder coated, steel mesh screen. This screen provides additional handling protection to reduce filter damage for optimum filtration.



PathogenBarrier filter media does not rely on electrostatic charge or biocide impregnation to perform. Filtration efficiency does not dissipate with time in use.


Camfil FastFrame


Camfil FastFrame
Camfil’s FastFrame is a holding frame for wall mounted air filtration systems.

Check Out FastFrame on Youtube at:

Camfil USA Air Filters FastFrameFeaturesLR

Camfil USA Air Filters DurafillnstallationLR



Holds PathogenBarrier L6 or L9 filters, prefilters or a combination thereof.

Aeropleat III, Aeropleat IV or other (2 or 4-inch) deep prefilters may be used without fasteners or clips, making installation quick and easy.

Available in full size (24″ X 24″), meeting the airflow sizing requirements of any application.

16-guage, all-welded galvanized steel.

Final filter and prefilter compression tabs facilitate a clear snap-in-place seal for the final filter and secure the prefilter.

Centering dimples, an integral part of the frame, assist in the alignment of the final or prefilter.

Pre-drilled frame-to-frame installation holes allow fast and secure built-up filter bank assemblies; up to six filters high by any number of filters wide.


Filter Ducts & Banks


Filter Ducts
Prefabricated filter ducts fit between roof trusses and adapt two, three, four or six PathogenBarrier filters to a ceiling air inlet to minimize airflow restriction and allow negative prssure ventilation systems to operate as designed. These sealed ducts are ideal for new construction and converting existing facilities to air filtration.


Filter Banks

PathogenBarrier filters can be assembled in a wall bank configuration for neutral and positive pressure ventilation systems as well as adaptation to tunnel and cross ventilated buidlings.



Pre-filter units capture larger particles before they reach the filter extending filter life. Two models of pre-filters are available, a 2″ unit recommended for filter ducts and a more durable 4″ unit recommended for applications where filters are exposed to the elements.


No Tools Required for Filter Installation and Maintenance

  • The poly filter duct system uses a one piece plastic housing with stainless steel cross members to ensure a quick and hassle free installation.
  • The media packs and pre-filters are held firmly in place with durable clamps and clips that make for easy filter inspection and replacement.
  • Molded handles in the filter carriage allow easy handling to prevent damage to the filters.




Backdraft Solutions

A tightly sealed structure is essential in insuring that filtered swine facilities remain free of airborne pathogens, particularly when conventional negative pressure ventilation systems are in use. Preventing leakage or backdrafting through the shutters of ventilation fans that are not in operation is especially challenging. AP offers innovative solutions to this problem that are effective in preventing air infiltration, yet allow fans to operate freely when required.


Backdraft Dampers

Designed to be installed over the existing shutter on wall mounted ventilation fans, these dampers provide an added level of protection against air leakage with minimal loss in fan performance. Light weight aluminum construction provides corrosion resistance and durability to stand up to the environment of swine facilities including frequent wash downs. The spring loaded, sealed damper assembly is easily removed from the housing to provide access to the existing shutter and fan motor for service and cleaning. Backdraft Dampers have the added benefit of decreasing energy cost by reducing the need for supplemental heat in buidlings.

AP Backdraft Dampers have been tested by the Swine Disease Eradication Center at the University of Minnesota and have been proven to be effective in preventing the aerosol transmission of the PRRS virus when used in conjunction with a typical PVC fan shutter.





RollSeal® Damper

RollSeal® is the ideal solution for sealing large tunnel ventilation fans in filtered swine facilities. RollSeal® Dampers feature a heavy duty reversing motor, wired in parallel with the fan motor, to open the unit when the environmental controller signals the fan to start and close the unit immediately when the fan is shut off. These units also feature two layers of durable woven polyethylene fabric sealed to the aluminum frame with an industrial hook and loop fastener system. An air space between the layers provide added insulation to conserve energy usage and eliminate the need for winter time fan closures. Because RollSeal® Damper units open fully when the fan is in operation, there is no restriction to airflow allowing fans to operate at their maximum potential.

NOTE: RollSeal® Dampers are not intended for use on variable speed fans.



How do I determine my ventilation system design?

Understanding your facility’s ventilation design and air pressure is essential to determinimg air quality and filtration requirements. AP recommends an aeration evaluation be performed by an experienced professional to determine filter count and the greatest protection from air infiltration.


Negative Pressure

Negative Pressure filtration is typically the simplest to adapt to existing ventilation systems already designed to operate under negative pressure. It is essential to seal the structure when utilizing negative pressure to prevent infiltration of unfiltered air into the building. Lower operating pressures require higher filter counts which contribute to lower energy cost and extend filter life. Negative pressure ventilation systems are utilized to prevent ‘permeation’, or the absorption of moisture and gases into the structure which can result in premature failure of the building.



Neutral Pressure

Neutral Pressure filtration utilizes a combination of supply and exhaust fans operating in unison to maintain a neutral or slightly positive pressure in the building. The use of neutral pressure decreases the potential for the infiltration of unfiltered air and permeation of the structure. The number of filters used can be decreased as the pressure of supply fans is increased, but energy cost will increase and filter life will decrease when fewer filters and greater pressure is utilized.


Positive Pressure

Positive Pressure filtration systems provide the greatest protection from infiltration of unfiltered air into the building. The number of filters required can be decreased as the operating pressure of supply fans is increased, but energy cost will increase and filter life will decrease accordingly. Positive pressure ventilation systems have the greatest potential for permeation of the structure, and buildings must be properly seales to prevent pre-mature deterioration caused by gases and moisture entering the structure.

How does air filtration prevent the spread of PRRS and other viruses?
Research has proven that the PRRS virus remains viable in an aerosolized state creating the possibility of a PRRS positive swine facility, infecting any other facilities positioned downwind. The use of high efficincy air filters positioned in front of all air entry points into a swine facility simply captures airborne particulate, including the virus and its host particle, before it can come in contact with the animal population.
Is the use of air filtration in swine facilities new technology?
Air filtration systems have been used in Europe and North America for several years, particularly on high-value, high-risk facilities such as boar studs. Many of these filtration systems have utilized HEPA (High Efficiency Particulate Air) filters in their design. The Camfil L9 PathogenBarrier filter was first applied to swine facilities in North America in 2005 and has been widely adopted due primarily to it’s substantially lower resistance to airflow than traditional HEPA filters. The L6 and L9 PathogenBarrier filters are the most widely tested filter for swine agents and has been part of extensive research involving PRRS and Mycoplasma.
Will the use of air filtration affect the performance of my ventilation system?
The addition of high efficiency air filters placed over air inlets and the use of back draft prevention devices on ventilation fans will have a negative effect on the performance of ventilation fans that does need to be accounted for in the design of an air filtration system. Additional ventilation fans or replacement of existing fans may be required in order to maintain the same air exchange rate experienced prior to the application of filtration.
Do my facilities need to be modified to adapt to air filtration?
Nearly all facilities can be adapted to air filtration, however, some modifications will be required. Common modifications include sealing of all cracks with caulking, the removal of natural ventilation curtains, the addition of air locks or double doors on entrances and exits, the addition or replacement of ventilation fans, the addition of back draft prevention on ventilation fans and in some cases an addition to the building to house the filters.
What is the life expectancy of a PathogenBarrier filter?
Like the pre-filters, the life expectancy of the PathogenBarrier filter is dependent on several factors including the rate of airflow through the filter, the amount of particulate in the air and environmental exposure. The use of properly fitted and maintained pre-filters is essential in extending the life of the PathogenBarrier filter. Filters should be replaced if ventilation performance suffers due to increased resistance to airflow caused by loaded filters and typically not more than three to five years after the filters were originally placed in service.
How often do pre-filters need to be changed?
Environment and application has a great deal to do with the expected life of pre-filters. Pre-filter life can vary from a number of weeks to a number of months depending on the amount of particulate present, the airflow through the filter and how exposed the filters are to the outside environment. Pre-filters installed on ducts in the attics of buildings generally last longer than those installed in filter banks that are more exposed to the elements. Pre-filters need to be changed when they are visibly dirty ot when ventilation system performance suffers due to the resistance to airflow caused by loaded pre-filters. AP recommends establishing a scheduled preventative maintenance program with emphasis on having clean pre-filters in place before seasonal demand is placed on the ventilation system.
When should L9 PathogenBarrier filters be used and when can less restrictive L6 PathogenBarrier filters be used?
PathogenBarrier selection and ventilation system design is determined by a variety of factors including proximity to potentially infected animals, topography, weather patterns, prevailing winds and the value of the stock being protected. In some applications, a combination of L9 and L6 PathogenBarriers may be the best solution. AP recommends that a risk assessment audit be performed by a veterinary expert experienced in aerosol transmission of swine pathogens to determine the best options.
Are antimicrobial filters effective protection against aerosol transmission of pathogens?
The use of antimicrobial air filters is appealing because there is the potential for decreased resistance to airflow and greater energy efficiency. These filters rely on particulate making contact with filter media fibers treated with an antimicrobial as the particulate is trapped in or passes through the filter. Concerns with this style of filter include the effective lifespan of the antimicrobial treatment and the possibility of pathogens passing through the filter without making contact with a treated fiber, particularly as the filter media becomes loaded with particulate over time.
Are electrostatic charged filters effective protection against aerosol transmission of pathogens?
Electrostatic filters rely on positively and negatively charged filter fibers to attract and capture airborne particles having the opposite charge. The use of this concept can increase a filter’s efficiency without increasing its pressure drop or resistance to air flow. However, as particles captured in the filter gradually neutralize the static charge, the filter’s efficiency is substantially compromised and may not provide adequate protection.
Does the use of PathogenBarrier filters eliminate the risk of aerosol transmission of pathogens?
While scientific research and field application has shown that the use of PathogenBarrier filters is highly effective in mitigating the risk of aerosol transmission of pathogens, the risk can not be totally eliminated. Filtration like other bio-security practices requires proper application, maintenance and training to be effective.



see brochure

Back to Environmental Control Systems