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2. Overpressure (CBRN protection) - Wikipedia

   en.wikipedia.org/wiki/Overpressure_(CBRN_protection)

   An overpressure protection system is one designed to protect an individual or group of individuals in a chemical, biological, radiological and nuclear environment.The two parts of the system are a safe area which as far as possible is sealed from possible contaminated air and an air filtration system which will filter out all possible toxins.

3. Corsi–Rosenthal Box - Wikipedia

   en.wikipedia.org/wiki/Corsi–Rosenthal_Box

   An example of a homemade unit. The Corsi–Rosenthal Box is a design for a do-it-yourself air purifier that can be built comparatively inexpensively. It consists of four [1] or five [2] [3] HVAC particulate air filters that form a cube and a box fan to draw air through the filters.

4. Hengst Automotive - Wikipedia

   en.wikipedia.org/wiki/Hengst_Automotive

   Hengst Automotive, based in Münster, North Rhine-Westphalia, Germany, is a company that specializes in fluid management, crankcase ventilation systems as well as filter systems for oil, fuel, air and cabin air filtration.

5. Donaldson Company - Wikipedia

   en.wikipedia.org/wiki/Donaldson_Company

   Donaldson Company, Inc. is a filtration company engaged in the production and marketing of air filters used in a variety of industry sectors, including commercial/industrial (engines, exhausts, transmissions, vents in private vehicles, hydraulics), aerospace (helicopters, planes), chemical, alternative energy (windmills) and pharmaceuticals.

6. Air filter - Wikipedia

   en.wikipedia.org/wiki/Air_filter

   Since the cabin air temperature depends upon the flow rate of the air passing through the heater core, the evaporator, or both, clogged filters can greatly reduce the effectiveness and performance of the vehicle's air conditioning and heating systems. [7] Some cabin air filters perform poorly, and some cabin air filter manufacturers do not ...

7. At least 5 shows canceled after drones fell from the sky at ...

   www.aol.com/least-5-shows-canceled-drones...

   At least five drone shows have been canceled or have paused the use of the systems, after several drones struck a crowd at a holiday show in Orlando on December 21. ... The best air purifiers of ...