Prevent or minimize exposure of building occupants, indoor surfaces and ventilation air distribution systems to environmental tobacco smoke (ETS). Weather-strip all doors in the residential units leading to common hallways to minimize air leakage into the hallway. Weatherstripping solutions from PEMKO can assist LEED projects in achieving this credit. PEMKO ASSA ABLOY suggests perimeter gaskets and seals that have been tested in accordance with UL 1784-2001Air Leakage Tests of Door Assemblies, and meet the performance criteria for allowable air leakage as specified in NFPA 105-99 Installation of Smoke Control Door Assemblies. Gaskets and seals meeting these standards should meet the intent of IEQp2.