The NAD VAV variable air volume box reads airflow with high accuracy across its entire operating range, even at very low velocities. Thanks to its NAD Klima–designed sensor, it keeps the same diameter as the ventilation duct. It eliminates the inlet restriction found on traditional VAV boxes.
The result is very low pressure drop, quiet operation, and stable control of minimum and maximum airflow based on the comfort demand of each zone.
In a variable air volume system, reliable airflow measurement across the box’s entire operating range is essential for the installation to perform properly. The sensors used in traditional VAV boxes have trouble reading low velocities. To measure minimum airflows, the duct diameter must be reduced at the box inlet, which adds pressure losses and noise.
NAD Klima’s R&D department developed a multi-point differential pressure sensor made of extruded aluminum. It measures airflow accurately down to a velocity of 0.5 m/s (100 fpm). Its profile was optimized using computational fluid dynamics (CFD) simulations. Reducing the diameter at the box inlet is no longer necessary, and fan energy consumption drops accordingly.
To make your selection, refer to the catalogue and the submittal drawing in the “Downloads” section of this page.