Ventilation products improve the air quality in homes or business spaces. There are two core types of ventilation - mechanical and natural. Mechanical products work by either circulating or removing undesired qualities such as heat or humidity through use of electrically powered components. Natural or passive products rely on natural airflow patterns or work in conjunction with mechanical ventilators to provide clean and fresh air. They are usually placed in walls or roofing to allow airflow to the outside and promote good air circulation. The range includes many solutions to various air quality problems.