The Promevent project, conducted by 8 French organizations, tests and analyzes 16 protocols for checks and measurements of residential ventilation systems. It aims to make the practices more uniform and to improve ventilation systems inspection protocols, which include visual checks, airflow and pressure measurements at air terminal devices and ductwork airleakage measurement, for both single-family houses and multi-family dwellings. In order to test the reliability of those protocols, various measurements have been performed on 2 multi-family dwellings with humidity demand controlled ventilation systems and 10 single-family houses with balanced ventilation with heat recovery systems. Those tests have been performed by different operators, with different types of measuring devices, on different types of air terminal devices. The analysis of these different measurements points out the weaknesses of the protocols and/or the minimum specifications the instruments should achieve to assure reliable results, in particular for airflow measurement at terminal devices, for which, the type of material used may induce uncertainties due to the technology (not all technologies might be used with all types of terminal) and due to the material it-self (important impact of the correction with calibration data). For ductwork airleakage measurements, important differences in results have been noticed with different obstructions of the ductwork at terminal devices. Results could also be different depending on the measurement method: measuring the section as a whole, or dividing the section into two sections, measured successively, and calculating a mean-value. Therefore, all the tests performed during these campaigns confirm the need for a unique and more reliable protocol.