Anyone who has ever lived in an apartment building knows the unpleasantness of involuntarily smelling what the neighbor two floors below is cooking for dinner or smoking after dinner, and of hearing all about the neighbors’ marriage problems. And controlling the air flow within a building doesn’t just control sounds and odors; it also reduces the spread of fire, smoke, and contaminants.
However, testing a whole building at once would require blowing massive quantities of air from one or two ground level doorways to pressurize all the upper floors. By the time the air flow reached the upper floors through the stairwells, some of the pressure would be lost, causing inaccurate readings….
Read more from Colin Genge's article, "Measuring Leakage in Multi-Family Buildings" in the September/October, 2007 issue of Home Energy.