Room-to-room Contaminant Flow
The spreading of contaminants or odours from one room in a building to another room even across multiple floors is a known effect. If the source location is presumed or known a tracer gas test is only required if the gas transfer should be quantified. But in reality there are often problems where the source is not known. Here a tracer gas test can identify the source location and the magnitude of gas transfer.
The reason for these effects can be manifold. E.g an unplastered exhaust duct from an underground garage could leak into duct-adjacent rooms in upper floors.
Elevator shafts, staircases or poorly sealed supply ducts and lines are typical migration paths.
Also the spreading of smoke in case of a fire event can be analysed using tracer gases. The increase of the smoke concentration in every room can be studied.