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What are the characteristics of AC, BC air filter combination?

The "AC/BC" air filter combination typically refers to a two-stage air filtration system that consists of two filters working together to clean the air.
The first stage, or "AC" filter, is typically an activated carbon filter. This type of filter is designed to remove gases, odors, and volatile organic compounds (VOCs) from the air. Activated carbon is a highly porous material that has a large surface area, which allows it to effectively adsorb and trap pollutants.
The second stage, or "BC" filter, is typically a HEPA filter. HEPA stands for "High Efficiency Particulate Air," and these filters are designed to capture tiny particles such as dust, pollen, and other allergens. HEPA filters use a dense, porous material to trap particles, and they must meet strict efficiency standards to be certified as true HEPA filters.
When used in combination, these two filters can provide a high level of air purification, removing a wide range of pollutants from the air. This can be especially beneficial for people with allergies or other respiratory issues, as well as those who live in areas with high levels of air pollution.