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NSAI has established a registration scheme that certifies an individual as a competent independent third party to validate that a ventilation system has been installed, balanced and commissioned to meet the minimum requirements of Technical Guidance Document (TGD) F - Ventilation (2019) to the Irish Building Regulations.

Checks and measurement methods broadly follow the guidance given in I.S. EN 14134: 2019: Ventilation for buildings – Performance testing and installation checks of residential ventilation systems. Ventilations systems must be designed and commissioned to provide adequate and effective means of ventilation to satisfy the minimum requirements of F1 of TGD to Part F of the Irish Building Regulations.

Further information is available in the NSAI Ventilation Validation Registration Scheme Master Document Rev 8. and also on via the following link;

Looking for a Registered Ventilation Validator?

Click 'Ventilation Validator Registration Scheme' from the drop-down menu here.

What Does the Scheme Involve?

Under the scheme, NSAI inspectors assess the operations and procedures of the Ventilation validator. NSAI inspectors witness a ventilation check and will review the accuracy of the applicant’s assessment of the as presented ventilation design for the same dwelling.

Individuals who wish to apply to registered as a NSAI certified Ventilation validator will need to demonstrate the following competencies;

•    The applicant will be required to demonstrate that they are familiar with a range of ventilation systems/approaches that they are likely to encounter in dwellings. Typical systems and approaches are described in TGD to Part F - Ventilation (2019) of the Building Regulations and Section 4 of the NSAI “Ventilation Validation Registration Scheme Master Document”.
•    The applicant can establish that the presented ventilation design provides for the minimum ventilation requirements as described in TGD to Part F - Ventilation (2019) of the Building Regulations.
•    The applicant will need to present a valid annual calibration certificates for all measuring instrument.
•    The applicant will need to pass an air flow proficiency test. See clause 8.3 of the NSAI “Ventilation Validation Registration Scheme Master Document”.
•    The applicant will need to demonstrate that they can correctly configure the dwelling prior to measuring the flow rate in the ventilation system.
•    The applicant retains adequate documentary evidence when carrying out a validation check.
•    The applicant has an adequate template to issue third party “Ventilation validation Certificates”.

What are the Benefits?

For consumers, the benefits of Ventilation validation are far-reaching in terms of energy efficiency of the dwelling improvement and indoor air quality improvement, providing enhanced comfort and health benefits to the occupant. . Home owners can be reassured that, at the time of validation, then ventilation system as installed in their dwelling provided the minimum ventilation rates as required under TGD to Part F - Ventilation (2019) of the Building Regulations.

As a result, Home owners can be reassured that best practice has been achieved to

(a) limit the moisture content of the air within the building so that it does not contribute to condensation and mould growth, and

(b) limit the concentration of harmful pollutants in the air within the building.

Home owners are reminded that adjustments to ventilation systems must only be carried out by competent installers.

Clause of TGD to Part F - Ventilation (2019) of the Building Regulations requires that provision should be made to facilitate transfer of air and cross ventilation between rooms, e.g. a 10 mm gap should be provided under doors.

Ventilation systems will require regular maintenance to clean filters and establish that equipment is operating correctly.   

What are the Fees?

Ventilation Validator Registration scheme


Initial Application Fee (1)

Annual Registration Fee(2)

Initial Audit/ Annual Audit

Ventilation validator




Currently registered NSAI Air Tightness Tester adding ventilation validation(3)




(1) Year one only
(2) Applies year two and onwards

(3)This rate only applied when the initial/annual audit for this scheme is combined with the annual audit for the Air Tightness testing scheme.

 All rates are Excl. of VAT

*The fee of €1,250 covers one pre audit submission of documents, audit and one subsequent satisfactory post audit submission.

The Validator of Ventilation Systems will be subject to an annual audit. Results of all tests must be retained for future inspection during annual audit.

What is the Registration Process?

The registration process is straightforward and involves the following steps:

  • The company submits its application for Ventilation Validator registration
  • NSAI contacts the company to arrange an audit date
  • Following proficiency testing and audit, NSAI will register the successful applicant under the scheme.