The term “treating fresh air” can have two meanings depending on the context:
1. Improving Indoor Air Quality:
In the context of buildings and ventilation, “treating fresh air” refers to conditioning it before bringing it indoors. This is because outdoor air can sometimes contain pollutants like dust, pollen, smoke, or even extreme temperatures. Here’s how fresh air is treated in buildings:
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- Filtration: Air filters of various grades remove particulate matter, allergens, and some pollutants from incoming fresh air.
- Temperature and Humidity Control: Heating, ventilation, and air conditioning (HVAC) systems can adjust the temperature and humidity of incoming fresh air to create a comfortable and healthy indoor environment. In some cases, dehumidification or humidification may be needed.
- Ventilation Strategies: Building design incorporates features that encourage natural ventilation like openable windows and cross-ventilation whenever possible. Mechanical ventilation systems use fans and ducts to continuously bring in fresh air and remove stale air.
2. Historical Context: Open-air Treatment
Historically, “open-air treatment” referred to a medical practice where patients with respiratory illnesses were exposed to fresh air and sunlight as part of their treatment. This was a common practice for conditions like tuberculosis before the advent of antibiotics.
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