Which statement about the purpose of the exhaust blower in a powered ventilation system is true?

Which statement about the purpose of the exhaust blower in a powered ventilation system is true?

• A. It filters air.
• B. It allows air to exit through the duct.
• C. It heats air.
• D. It detects gas leaks.

Answer: (B)

The key idea is that the exhaust blower’s job is to push air out through the duct to create air movement and remove contaminants from the space. When it runs, it forces room air into the exhaust duct, helping to carry away smoke, fumes, heat, or other pollutants and drawing in fresh air through open intakes. It doesn’t filter the air, heat it, or detect gas leaks—those functions belong to filters, heaters, and gas detectors, respectively. So the statement that best describes its purpose is that it allows air to exit through the duct.

The key idea is that the exhaust blower’s job is to push air out through the duct to create air movement and remove contaminants from the space. When it runs, it forces room air into the exhaust duct, helping to carry away smoke, fumes, heat, or other pollutants and drawing in fresh air through open intakes. It doesn’t filter the air, heat it, or detect gas leaks—those functions belong to filters, heaters, and gas detectors, respectively. So the statement that best describes its purpose is that it allows air to exit through the duct.