This research report is a follow-up to the gas stations work package from Hydelta 1.0. That study showed that for various types of gas cabinets, hydrogen more often leads to a combustible mixture at the ventilation openings than natural gas, assuming the leakage flow rates chosen in that study. This led to the recommendation to carry out additional research to identify the effects of smaller, more common leakage flow rates. It was also recommended to investigate which types of different gas cabinets are frequently used in the Netherlands. This report further develops these recommendations. This follow-up research is important because ventilation is an important measure in the event of an unintentional gas leak. Ventilation dilutes the gas and minimizes the risk of ignition or explosion. For the transition to hydrogen, it is important to know whether these gas pressure regulating stations with the same types of gas cabinets carry the same risk with the application of hydrogen. The aim of this study is to gain further insight into how hydrogen behaves in existing gas cabinets compared to natural gas. That insight was obtained by looking at the issue from different angles: experiments as well as simulations using finite element method (CFD). This provided interesting insights that will help policymakers determine whether, and if so what, further measures can be taken. 1st step: Inventory common types of gas cabinets Some 55,000 gas stations are operated by district system operators (DSOs) in the Netherlands. An inventory of gas cabinets used in the Netherlands was carried out. It focused on cabinets installed by DSOs in the last 10 years, because conversion of installations to hydrogen will initially take place with relatively new cabinets and these installations are designed in accordance with NEN1059. This does not mean they are exactly the same, but they are designed with the same minimum functional requirements. Three types of gas cabinets comprise a substantial part of the total amount of stations. These are ...