A negative air machine is a device that removes air from inside the environment. Generally, it is a fan attached to flexible ducting with the output of the ducting exhausted through a window, its goal is to remove the tainted air from the internal environment and exhaust it outside.
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It is important to note that there are different types of air purifiers, such as ozone and ion generators, electrostatic precipitators or charged media filters. Each type of air purifier has its own benefits in particular situations, or are used for different reasons and applications. For this situation, however, air purifiers that use HEPA filtration, removes 99.97% of air particles that are pulled through its fine mesh and are therefore the most applicable for dust control.
Our 2 most common units for allergy sufferers is the HEPA 500 and the HEPA 800. The Hepa 500 is suitable for a small room while the HEPA 800 is suitable to put in a hallway or in a large area. Both of these units are HEPA rated, meaning they can filter our dust, pet dander, dust mite feces, pollen, mould spores as well as other allergens which exist in the home environment.
This air purifier/cleaner can remove contaminants up to 0.3 microns, making it effective for filtering mould spores and soot particles. They can also be used to remove smoke/soot smell from the air through the use of a carbon filter.
To increase the efficiency and life of the unit there are essentially 3 levels of filtration inside the unit.
The number of air scrubbers that you need will depend on the size of the enclosed area you are trying to filter. The general standard according to the IICRC is 4-12 times per hour. Additionally, to create negative air in your environment you need to ensure there is more air leaving the room than air that enters.