Air filters varies in price and function. Air filters use different rating systems to describe how air filters will effectively capture the particle that pass through the filters. Air filter manufacturers use various acronyms to describe the filtration standard of there air filters.
For instance, many use the MERV rating system to describe how well an air filter will capture particle. However, the MERV rating isnt the same than a HEPA rating. HEPA filters use a dense web of fiber that will capture the pollutants that pass through the filter.
How Air Filters Are Rated
The particles that cannot pass through the dense web of fibers will either be too large for the hole within the fibers or will be light enough for them to bounce into the fibers. There is a specific size of particle that will be difficult for air filters to capture. Air filter manufacturer use this particular size of particle to test the efficiency of an air filter.
If an air filter stops these specific size particles, the air filter will stop all other size of particles. When purchasing an air purifier, there are several factor to consider, including the relationship between air filtration quality and air volume. Air filtration quality considers how well the air filter will stop the particles in the air.
Air volume describes how much air the air purifier will move. The Clean Air Delivery Rate of an air purifier, or CADR, describes