Dry Bulb Parameters placement distance from ventilation?

Dry Bulb Parameters placement distance from ventilation?

• A. At least 2 ft
• B. At least 1 ft
• C. At least 3 ft
• D. At least 4 ft

Answer: (A)

The key idea is to get an accurate reading of room air temperature by avoiding the influence of direct airflow from vents. If a dry-bulb sensor sits right in the jet of supply air, the reading will reflect the temperature of that stream rather than the room’s average air temperature, leading to skewed measurements. Placing the sensor at least 2 feet away from ventilation outlets reduces this direct jet effect while still staying within the room’s representative air. This distance helps ensure the reading reflects the room’s ambient temperature rather than localized heating or cooling from the vent. For consistency, keep the sensor away from direct sunlight, radiant heat sources, and obstructions that could create stagnant pockets, so the measurement represents the typical breathing-zone temperature.

The key idea is to get an accurate reading of room air temperature by avoiding the influence of direct airflow from vents. If a dry-bulb sensor sits right in the jet of supply air, the reading will reflect the temperature of that stream rather than the room’s average air temperature, leading to skewed measurements. Placing the sensor at least 2 feet away from ventilation outlets reduces this direct jet effect while still staying within the room’s representative air. This distance helps ensure the reading reflects the room’s ambient temperature rather than localized heating or cooling from the vent. For consistency, keep the sensor away from direct sunlight, radiant heat sources, and obstructions that could create stagnant pockets, so the measurement represents the typical breathing-zone temperature.