Airflow · duct leakage · heat exchangers
HVAC and ventilation testing.
We check that ventilation and air-conditioning systems deliver their design airflows and that ductwork is airtight. Airflow, duct leakage and heat exchanger tests are in our accredited scope, and the same team handles balancing.
- ATS 01-008accredited lab
- ISO/IEC 17025:2017
- since 2001accredited
- AAir handling unit
- BTest ports on the duct
- CVelocity field in the section
- DLeakage test rig
- ETest result
- 1Test ports and measuring grid in the cross-section
- 2Pitot traverse: velocity field and airflow
- 3Leakage test: the duct under pressure
- 4Airflow and airtightness class in the report
What we test
HVAC and ventilation testing
Airflow – Pitot traverse
Velocity-area method with static Pitot tubes in ducts and air handling units (ISO 3966:2023).
Flow through orifices and Venturi tubes
Water and air flow with differential-pressure devices (EN ISO 5167-1 and -2:2022).
Duct leakage
Ductwork air-tightness from 750 Pa negative to 2000 Pa positive pressure (EN 1507, EN 12237, DW/143, DW/144, EUROVENT 2/2, SMACNA).
Heat exchanger performance
Testing to EN 305 and EN 306.
Balancing and regulation
Hydronic and air balancing, ultrasonic measurement on pipes and equipment capacity checks. These services are outside the accredited scope.
Accreditation and standards
ATS 01-008 scope of accreditation
The tests on this page are covered by the scope of accreditation of our Testing and Measurement Laboratory. Reports carry the accreditation mark; methods and ranges are listed below.
- Accreditation No.
- ATS 01-008
- Standard
- ISO/IEC 17025:2017
- Initial accreditation
- 3 Sep 2001
- Valid until
- 15 Mar 2027
| Subject | Test | Range | Reference document |
|---|---|---|---|
| Water and air distribution installations (air conditioning and ventilation) | Flow measurement with orifice plates, nozzles and Venturi tubes | 0–200 kPa | SRPS EN ISO 5167-1:2022; SRPS EN ISO 5167-2:2022 |
| Flow measurement by the velocity-area method with static Pitot tubes | 0–3500 Pa | SRPS ISO 3966:2023 | |
| Air duct leakage testing | 750 Pa negative – 2000 Pa positive pressure | SRPS EN 1507:2010; SRPS EN 12237:2010; DW/143:2000; DW/144:1998; EUROVENT 2/2:1996; SMACNA | |
| Heat exchangers | Performance testing of heat exchangers | 0–200 kPa; −20 °C to 200 °C | SRPS EN 305:2012; SRPS EN 306:2012 |
Balancing, ultrasonic pipe flow measurement and balancing-valve measurements are engineering services outside the accredited scope.
Process
How it works
- 01
Design review
We establish design flows, pressures and the leakage class.
- 02
Test points
We choose cross-sections and the measuring grid and drill test ports.
- 03
Airflow measurement
Flow is measured in each section with a Pitot tube or orifice.
- 04
Leakage test
A section of ductwork is sealed, pressurized and the leakage measured.
- 05
Adjustment
Dampers and valves are adjusted where needed and the test repeated.
- 06
Report
A test report comparing results with the design.
What you get
Report and results
- Test report from an accredited laboratory
- Measured flows per branch vs. design
- Duct leakage result and airtightness class
- Balancing record (if carried out)
- Recommendations
Who needs it
Who we work for
- HVAC contractors before handover
- Developers and supervisors
- Hospitals, laboratories and cleanrooms
- Hotels and offices
- Industrial plants
FAQ
Frequently asked questions
How is duct airflow measured?
Usually by the velocity-area method: a Pitot tube measures velocity at several points across the duct and the flow is calculated from the mean velocity and area. It is in our scope to ISO 3966:2023.
What is a duct leakage test?
A section of ductwork is sealed and pressurized and the air needed to hold the pressure is measured. The airtightness class follows from EN 12237 or EN 1507.
To what pressure do you test?
Per our scope, from 750 Pa negative to 2000 Pa positive pressure.
Do you also balance systems?
Yes, as an engineering service; final measurements are done by the accredited laboratory. Ultrasonic pipe measurement and balancing-valve measurement are not in the accredited scope.
Is this needed for handover?
Clients, supervisors and inspection committees often ask for proof that design flows are achieved and ducts are airtight. An accredited test report provides it.
Contact
Tell us what needs testing.
Send the building type, location and the test you need, and we will reply with a quote and a date.
