Air sealing between units is recommended for several reasons, even if smoking is banned.  In multifamily buildings and hotels it is common for occupants to smoke inside their units despite nonsmoking policies. Without air sealing between units, other

Air sealing between units is recommended for several reasons, even if smoking is banned.  In multifamily buildings and hotels it is common for occupants to smoke inside their units despite nonsmoking policies. Without air sealing between units, other occupants may be exposed to secondhand smoke and odors. Air sealing between units also improves energy performance, particularly in high rises subject to the stack effect, in which warm, buoyant air rises upward, leading to thermal losses and ventilation problems. Acoustic privacy is also improved by air sealing, and air sealing also reduces pathways for vermin.