The DIN 18379 "Room Air Technology Systems" applies to the construction of room air technology systems (RLT systems) where air is mechanically transported. The ATV was technically revised by the German Procurement and Contracting Committee for Construction Services (DVA) as part of the VOB update in 2016. This primarily concerns Section 5 "Billing." Furthermore, all references to the VOB/A have been updated, and cross-references to related standards have been adjusted to the latest developments. For the first time, a commentary on the new provisions is available. The original sections of the standard are highlighted in gray, with the commentary provided immediately afterward. Images and diagrams illustrate the standard text, and numerous examples facilitate practical implementation.