Gas-extinguishing systems make special requirements during the planning phase because, in order to evaluate the effectiveness of the gas-extinguishing facility, it is important to know how leakproof the room to be protected actually is.

Based on these measurements, it can be determined how large the leakage area is in the room. This value influences the composition and holding time of the intended extinguishing gas concentration. With the door fan test, cost and time-intensive flooding tests can be kept to a minimum.