The testovent 417 Flow Straightener Set is the complete solution for measuring volume flow at challenging swirl outlets. This set combines Testo’s patented volume flow straightener with two specially designed funnels, providing a reliable method for transforming turbulent airflow into a uniform, measurable stream.

Swirl outlets often produce turbulent airflows, making it difficult to achieve consistent measurement results using only a vane anemometer and funnel. Depending on the swirl direction, measurements can fluctuate, leading to inaccurate volume flow readings and suboptimal system balancing.

With the testovent 417 flow straightener, you can redirect turbulent airflow into a steady stream, enabling precise and repeatable measurements. This solution is exclusive to Testo and is ideal for professionals conducting ventilation testing or HVAC system commissioning.

The set includes: testovent 417 flow straightener plus two measurement funnels for ventilation grilles and plate outlets,with a durable and portable case for easy transport and storage.

A compatible vane anemometer (e.g. testo 417 or Ø 100 mm vane probes for testo 435 / testo 480) is required for measurements and can be ordered separately.