Which of the following is an example of environmental air exhaust?

The correct answer is the kitchen range exhaust because it is specifically designed to remove cooking fumes, smoke, and other pollutants generated during food preparation. This type of exhaust system is crucial for maintaining indoor air quality by venting harmful substances outside. Proper ventilation in a kitchen helps in reducing odors, moisture, and the risk of indoor air pollution, making it a clear example of environmental air exhaust.

In contrast, heating vents primarily circulate warmed air within a building but do not effectively remove contaminated air from the environment. Industrial fans may also be used for various applications, including increasing air circulation, but they do not exclusively focus on exhaust from an environmental standpoint. Air conditioning units, while they do help remove heat and dehumidify the air, do not serve the primary function of exhausting environmental air, as they typically recirculate indoor air.