Wastewater Treatment Operator Certification Practice Test

Where is the correct location for a vent inside a room storing chlorine gas?

1. 12 inches below the ceiling

2. At nose level

3. Within 12 inches of the floor

4. At the highest point in the room

The correct answer is: Within 12 inches of the floor

In a room that stores chlorine gas, the proper location for a vent is at the highest point in the room. Chlorine gas is denser than air; therefore, it tends to accumulate near the floor, which makes positioning the vent at or near the floor an effective way to manage and ventilate any potential gas leaks. By placing the vent low, any chlorine gas that may escape will be directed outside efficiently, reducing the risk of inhalation hazards for personnel working in or around the storage area. Vents at higher levels would be less effective for this purpose since the chlorine gas, being heavier than air, would not flow toward them as easily. In addition, proper ventilation is critical to maintain safety in environments where hazardous gases, like chlorine, are present. Adequate venting helps to mitigate the buildup of potentially harmful concentrations of gas in the event of a leak, ensuring a safer working environment for operators and other personnel.