The paper proposes a new best practise for smoke management as part of safety engineering in tunnels and underground facilities. Particular requirements on passive measures such as platform-screen doors and anti-recirculation walls are also described. The main focus is on active smoke management using ventilation systems. The paper proposes that the dimensioning is to be carried out according to six main cases, applying a main and a minor design criterion. When only considering the smoke-management system and no other mitigation measures, this dimensioning corresponds to the minimum operation requirement. Closed-loop control of the longitudinal flow is a challenge, in particular due to the difficulty of obtaining adequately accurate measurements of the flow. The review of fire detection systems results in a proposal of properly specified linear heat detectors. In addition, smoke detectors using a novel data analysis technique can be beneficial. It is advocated that smoke-management systems shall be operated fully automatic. However, manual operator intervention shall be possible.