A device used in heating, ventilation, and air conditioning (HVAC) systems, it measures the volumetric airflow rate exiting or entering a diffuser, register, or grille. This instrument typically consists of a fabric hood attached to a base containing a pressure sensor and a digital display. By capturing the air passing through the opening and measuring the pressure difference created, the device calculates and displays the airflow in cubic feet per minute (CFM) or liters per second (L/s). For example, during commissioning of a new HVAC system, technicians use this equipment to verify that air is being delivered to each room according to the design specifications.
Accurate measurement of airflow is critical for ensuring occupant comfort, maintaining indoor air quality, and optimizing energy efficiency. Undetected imbalances in air distribution can lead to hot or cold spots, inadequate ventilation, and increased energy consumption. This measurement device allows for precise adjustments to dampers and fan speeds, ensuring that the HVAC system operates within design parameters and meets the specific needs of the building. Historically, airflow measurement relied on less precise methods, leading to inconsistencies and inefficiencies. The development of this instrument has significantly improved the accuracy and reliability of airflow measurements in HVAC systems.
