One of the main things that help in
One of the main things that help HEPA air filters in being so efficient is the fan that is inside the purifying unit. These fans assist in trapping large particles in the folds of the filters while the smaller particles and chemicals get attached to the charcoal in the filter. Some air purifiers have fans with a straight design where the air is drawn in from the back of the unit and blown out through the front. Others have unidirectional fans that pull the air from all sides of the unit and blow the filtered air out in all directions. These types of air purifiers can be used to purify the air of entire home.