Where should you avoid placing fresh air intakes?

Placing fresh air intakes low to the ground, in garages, by front doors, or in soffits is not advisable primarily due to potential contamination and quality of the air being drawn into the building. These areas are often exposed to pollutants such as vehicle exhaust, dust, or other environmental contaminants. Additionally, fresh air intakes in these locations could introduce unwanted moisture or humidity into the indoor environment.

In contrast, higher placements such as on roofs or high in walls tend to provide cleaner air, as they are less likely to draw in the pollutants and contaminants found near the ground. While fresh air intakes in attic spaces may have their own set of challenges, especially concerning temperature and insulating properties, they are still preferable to low placements because they are generally further away from potentially contaminated air sources. Thus, it is critical to consider the quality and purity of the air when determining optimal locations for fresh air intakes.