Volume Flow Hood
The uniquely light testo 420 volume flow hood
Light, precise and convenient: the testo 420 flow capture hood makes volume flow measurement at larger air inlets and outlets considerably easier. At only 2.9 kg, it is the lightest volume flow hood on the market. And with its integrated flow straightener, the measuring device for volume flow measurement sets new measuring precision standards at swirl outlets. This allows users to fulfil hygiene guidelines and requirements for indoor air quality and volume flow in ventilation and air conditioning systems quickly and precisely, e.g. in industry, office areas or cleanrooms.
The testo 420 volume flow measuring hood offers you the following
- Ergonomic: uniquely light at less than 2.9 kg in weight (standard flow hood 610 x 610 mm).
- High-precision: flow straightener significantly reduces the usual measurement errors at swirl outlets.
- Efficient: fast set-up, easy handling and convenient operation via testo 420 App.
Light, precise and convenient: the testo 420 flow capture hood makes volume flow measurement at larger air inlets and outlets considerably easier. At only 2.9 kg, it is the lightest volume flow hood on the market. And with its integrated flow straightener, the measuring device for volume flow measurement sets new measuring precision standards at swirl outlets. This allows users to fulfil hygiene guidelines and requirements for indoor air quality and volume flow in ventilation and air conditioning systems quickly and precisely, e.g. in industry, office areas or cleanrooms.
The testo 420 volume flow measuring hood offers you the following
- Ergonomic: uniquely light at less than 2.9 kg in weight (standard flow hood 610 x 610 mm).
- High-precision: flow straightener significantly reduces the usual measurement errors at swirl outlets.
- Efficient: fast set-up, easy handling and convenient operation via testo 420 App.
Measure volume flow correctly with these advantages
In addition to the very low weight and the flow straightener, the following features will make your day-to-day work easier:
- Ergonomic grips
- Tiltable and removable display
- Funnel-shaped tension rod sockets for quick and easy set-up
- Trolley for secure transport also supplied
- App integration for smartphones and tablets, turning these into a second display and remote control via Bluetooth. Particularly practical for the safe use of a tripod for high ceilings.

Volume flow measurement at swirl outlets - the background
Problem for measuring hood volumetric flow at swirl outlets: air turbulence

Without an integrated flow straightener, the measurement result can be falsified by air turbulence.
Depending on how the flow hits the instrument, the flow velocities measured are either too high or too low.
Solution: volume flow hood from Testo with flow straightener
