airflow vents

Optimum and appropriate techniques

Measuring the airflow rate through a building's air vents, grilles and diffusers helps to ensure thermal comfort, control the air change rate for indoor air quality and optimise the ventilation system's energy efficiency.

This applies to all types of buildings, whether residential, commercial or industrial, and also for safety reasons (smoke extraction, etc.). Whatever the method (scanning, zoning or cone measurement), the measurements must be taken with instruments adapted to the different types of air vents.

Parameters to be monitored

  • Airflow and air velocity

Scanning method

Scanning method

On small flat grilles with straight airflow, scanning consists of placing a propeller probe 2 cm from the grille and sweeping across its entire supply or exhaust surface. The average flow rate is then calculated over a given period of time.

For optimum grid measurement using the scanning technique, we recommend using helix probes with a diameter of 100 mm. They provide fast, accurate results, particularly on large grids. Sauermann offers a wide range of propeller anemometers such as the Kimo AMI310.

read more about AMI 310

AMI 310


Kimo’s AMI 310 measures simultaneous parameters including pressure, temperature (Pt100 and thermocouple), humidity, air quality (CO/CO2), air velocity, airflow (vane probes and hotwire), and tachometry.

read more about Si-VV3


Vane Thermo-anemometer with integrated vane probe

The palm-sized Sauermann Si-VV3 vane thermo-anemometer easily measures airflow, air velocity & temperature with its vane probe.

airflow vents
Zoning method

Zoning method

For flat grids with unidirectional flow, the zoning technique (or point-by-point averaging) is also used. This involves dividing the cross-section of the grid into zones and averaging the flow rates in each zone to derive an overall result.

The most reliable values combine average measurements for each zone over the same period of time. The choice of probe depends on the application, but for very low-speed airflows requiring high sensitivity and accuracy, a hot-wire probe is recommended.

read more about VT 210

VT 210


Specially designed for the control of ventilation systems, the VT 210 allows users to measure the air velocity, the airflow and the temperature in ducts.

read more about VT 110 / VT 115

VT 110 / VT 115

Hotwire thermo-anemometer

Kimo’s VT 110 / 115 is perfect for measuring airflow, air velocity and temperature with its hot wire probe.

airflow vents
Cone measurement

Cone measurement

Using a cone of the right size will improve efficiency and accuracy. For diffusers larger than 450x450 mm, a balometer is more versatile and specialised. This equipment is essential for multidirectional flow diffusers.

Applying a cone interferes with the airflow by generating turbulence. Our anemometers can compensate for the generated pressure drop by selecting the type of cone in their menu. For balometer measurements, this compensation is achieved by selecting the vent profile on the mobile application.

read more about DBM 620

DBM 620

Air Flow Meter

The newly redesigned Sauermann DBM 620 Air Flow Meter is a multipurpose electronic air balancing instrument primarily used for efficiently taking direct air volume readings from air vents. 

read more about Airflow cones

Airflow cones

For hotwire anemometers

The K35, K75, K120 and K150 are airflow measurement cones designed for Ø 8 mm hot-wire anemometers. 

These cones are especially suited to Kimo VT 110, VT 210, MP 210 and AMI 310 instruments.






K35 (10374)
K75 (10637)
K120 (11595)
K150 (11926)
10 to 400 m3/h
30 to 750 m3/h
50 to 1200 m3/h
10 to 400 m3/h
200 x 200 mm
Height: 330 mm
300 x 300 mm
Height: 470 mm
450 x 450 mm
Height: 600 mm
550 x 100 mm
Height: 585 mm
read more about Airflow cones

Airflow cones

For vane anemometers

The Si-K25 and Si-K85 are airflow measurement cones designed for 100 mm diameter vane anemometers. These models feature a honeycomb-structured airflow straightener that reduces turbulence for more reliable flow measurement. 

The Si-K25 and Si-K85 are perfectly suited to Kimo LV 110 and LV 130, VT 210, MP 210 and AMI 310 anemometers

The Si-K85 square cone can be used with medium-sized air vents.
The Si-K25 round cone is designed for small and medium-sized round vents.




Si-K25 (28111)
Si-K85 (28112)
10 to 400 m3/h
10 to 400 m3/h
Internal dimensions
Ø 260 mm
350 x 350 mm
External dimensions
L 282 x W 282 x H 268 mm
L 372 x W 372 x H 327 mm
airflow vents
Metrological Services

Metrological Services

Whatever the technique or type of probe used to measure airflow, the sensors are subject to physical constraints. They need to be calibrated frequently to guarantee reliable measurements - every year at best.

At Sauermann, we calibrate your anemometers and balometers in our laboratories in the Dordogne. The operation takes place in areas equipped with state-of-the-art speed benches for maximum accuracy and compliance with standards.

airflow vents
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45 years of experience

For over 45 years, the Sauermann Group has been designing, manufacturing and marketing products and services dedicated to the HVACR and industrial markets.