Filters prevent the heating and cooling coils from being coated with dirt which reduces heating and cooling transfer while increasing energy consumption. Excessive dirt eventually plugs coils, necessitating an expensive cleaning operation. Dirt on a wet coil presents a food source for bacteria, mold and fungal growth.

Filters prevent dirt from accumulating in duct work where it can create a fire hazard and provide a breeding ground for odor and bacteria.

Filters keep dust particles out of computers, electrical equipment, and other expensive equipment reducing repair and calibration.

Filters directly impact maintenance, cleaning and life of furniture and fixtures by maintaining interior surfaces.

Filters contribute to the maintenance of lighting levels. Stain darkened walls lose their reflectiveness. Fluorescent lamps become less effective as the fine dirt precipitates on them. Light fixture lenses lose their initial light transmission characteristics.

Filters provide a cleaner, healthier environment for the students, teachers, visitors and facility staff.