Where shall the air removed by every mechanical exhaust system be discharged?

The correct answer is that the air removed by every mechanical exhaust system should be discharged outdoors. This is essential for maintaining good indoor air quality and preventing the buildup of contaminants, odors, and moisture inside a building. Venting air outside helps remove pollutants and excess humidity, which can be harmful to both the health of occupants and the structural integrity of the building.

Discharging the air indoors can lead to the accumulation of unwanted air pollutants, which can create an unhealthy environment. Additionally, venting into a basement or attic is inappropriate as these areas can trap moisture and pollutants, exacerbating issues like mold growth and structural damage. Proper outdoor discharge ensures that any unwanted air is vented safely away from living spaces, promoting a healthier indoor atmosphere.