The testovent 417 Volume Flow Straightener is designed to ensure accurate and reproducible volume flow measurements at swirl outlets, which are typically difficult to measure due to irregular air movement.

Thanks to its innovative flow straightening technology, this accessory transforms swirling flow into a uniform, measurable airflow, allowing precise readings using a vane anemometer such as the testo 417 or compatible Ø 100 mm vane probes (testo 435 / testo 480).

Used in conjunction with the testovent 417 measurement funnels, it provides an ideal measurement setup for HVAC technicians who demand reliable flow velocity and volume flow readings in complex air outlet scenarios.