Collective protection (CP) air filters, the most common being the military’s M48A1 and the M98 filters, are designed to remove toxic compounds from the air in ground vehicles, field hospitals, command posts, and ships, as part of an overpressure system, creating a toxic-free area for personnel during nuclear, biological, or chemical weapon attacks.
In their simplest form, a CP filter allows air to flow through a gas filter bed of activated, impregnated carbon media in a manner that facilitates contact between the airstream and the carbon media. CP filters may be in operation on a continuous or near continuous basis, processing large volumes of air during their lifetime.
While effective at removing toxins, CP filters can be degraded by common ambient air contaminants including sulfur dioxide, nitrogen dioxide and vapors from diesel, jet, and auto fuel. To address this situation, a team of Army and Navy researchers developed an initial filter, called a guard bed, situated upstream of the CP, which can remove filter degrading compounds.
The filter material contains zirconium hydroxide loaded with base metals (copper, zinc, cobalt), triethylenediamine, and microporous activated carbon. This inexpensive, replaceable filter is expected to greatly lengthen the effective life of the CP filter and provide additional protection to people operating in at-risk environments.
The M98 filters are used on:
- U.S. Military M84, M95, and M96 filtration systems
- U.S. Air Force Multiple Cell Radial Filter Housings
- U.S. Army buildings and transportable shelters
They could also be used to filter air in hospitals, subway tunnels, bunkers or safe rooms.
- Extends the service life of a collective protection filter
- Applicable to buildings (permanent and temporary), ships, cars, and planes
- The guard bed may be of low volume so as not to significantly increase the pressure drop through the CP filter
- Businesses can commercialize the technology by licensing US patents 9,700,744; 9,352,175; and 9,034,289
- Patent license enables civilian commercial sales and foreign military sales
- TRL 9: multiple prototypes have been built and tested
- License fees are negotiable, contact TechLink for more information