Final answer:
Exhaust fans should be placed near sources of indoor pollution or moisture for effective ventilation. Ceiling fans with smooth blades are more efficient and quieter compared to those with decorative features.
Step-by-step explanation:
The correct answer is that an exhaust fan should be positioned where it can most effectively remove polluted indoor air and bring in fresh outdoor air, such as near sources of indoor pollution like kitchens and bathrooms, or high-humidity areas to prevent mold growth.
This positioning ensures that the exhaust fan can aid in ventilation by extracting the warm, stale, or moist air from the premises and replacing it with cooler and fresher outdoor air.
In terms of efficiency and noise, ceiling fans with smooth blades are generally considered to be both quieter and more efficient than those with decorative features such as wicker reeds.
The correct answer is option B: near the source of pollutants. Positioning an exhaust fan near the source of pollutants ensures that the fan effectively removes the pollutants and prevents them from spreading to other areas.
For example, in a kitchen, placing the exhaust fan right above the stove or cooktop can effectively capture and remove smoke, steam, and cooking odors.
This placement helps maintain good indoor air quality and prevents the pollutants from lingering in the space.