General Info

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The volume flow straightener testovent 417 subdues the swirl, ensuring
more precise measurement results.
The volume flow straightener testovent 417 is installed
between the measurement funnel and the vane probe. In its
interior is a specially developed honeycomb structure which
ensures that the swirl is interrupted and converted into an
almost uniform flow. This allows up to 50 % more precise
volume flow measurements at swirl outlets.
However, the volume flow straightener is a passive
system, and cannot compensate pressure loss – a certain
measurement inaccuracy must therefore always be taken
into account. This is, however, considerably reduced in
comparison to other passive measurement methods.
This allows the volume flow straightener testovent 417 on
the one hand to save costs and energy thanks to more
efficiently adjusted ventilation systems, and on the other
hand to control an important factor for thermal comfort
reliably and better.
The volume flow straightener testovent 417 can only be
used in combination with a funnel (funnel set testovent
417) and a measuring instrument. The following options are
available as measuring instruments:
• Vane anemometer testo 417
• Reference measuring instrument testo 480 in combination
with a 100 mm vane probe
• Multi-function measuring instrument testo 435 in
combination with a 100 mm vane probe
Funnel for plate outlets
with Ø 200 mm.
Measuring instrument,
e.g. testo 417.
Volume flow straightener
testovent 417.
Funnel for ventilation
outlets 330 x 330 mm.
TS_PS_testovent_417_MASTER.indd 3 03.12.2013 14:01:42