Which system includes air filtering devices?

Ventilation systems are specifically designed to facilitate the exchange of air in enclosed spaces, which includes filtering air to improve indoor air quality. These systems work by bringing in fresh outdoor air, circulating it throughout a space, and exhausting indoor air that may contain pollutants or contaminants.

The presence of air filtering devices is crucial in ventilation systems as they help remove dust, allergens, and other particulates from the air, ensuring that the air circulated within a building is clean and healthy. This functionality aligns closely with the primary purpose of a ventilation system, which is to maintain acceptable indoor air quality while providing thermal comfort.

In contrast, heating systems mainly focus on generating heat and may not prioritize air filtration as a primary function. Similarly, cooling systems are primarily concerned with lowering temperatures and may include some basic air filtering as part of their operation, but they are not primarily designed for air quality management. Gas-fired systems specifically denote a type of heating system that uses gas as a fuel source; thus, they will not encompass the broader functionalities of ventilation systems that are geared towards filtering air.