Occupational and Environmental Health: Recognizing and Preventing Disease and Injury - Multiple Choice Questions 2025 - Free Practice Questions and Study Guide

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What does the effectiveness of a local exhaust ventilation depend on?

The speed of the air pump

The distance from the source of emission and presence of cross-drafts

The effectiveness of a local exhaust ventilation system is dependent on the distance from the source of emission and the presence of cross-drafts. This is because the purpose of a local exhaust ventilation system is to remove harmful substances from the air and prevent them from spreading throughout the environment. Therefore, the closer the exhaust vent is to the source of emission, the more effectively it can capture and remove the harmful substances. Additionally, the presence of cross-drafts, which refers to air movement across the path of the exhaust vent, can greatly influence the capture and removal of harmful substances. A strong cross-draft can disrupt the airflow of the exhaust, reducing its effectiveness. Therefore, the color of the exhaust vent or the temperature of the air being ventilated, while potentially important factors in other contexts, are not relevant to the effectiveness of a local exhaust ventilation system in removing harmful substances from the air.

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The color of the exhaust vent

The temperature of the air being ventilated

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