What minimum distance must a hanging dry bulb be from a ventilation source?

The correct answer indicates that a hanging dry bulb should be positioned at a minimum distance of 2 feet from a ventilation source. This distance is crucial for ensuring accurate temperature readings. When a dry bulb is too close to a ventilation source, it can be subjected to direct airflow, which may lead to erroneous temperature readings due to drafts affecting the sensor.

Maintaining this minimum distance helps ensure that the dry bulb accurately reflects the ambient temperature, rather than being influenced by the temperature variations introduced by the airflow from the ventilation source. This is essential in many applications, such as HVAC systems, where precise temperature measurements are necessary for effective temperature control and system efficiency. Proper positioning ensures that the readings can be trusted and used for maintaining comfortable environmental conditions.