Under option 2 of this credit, the LEED Guidance states that: "At a minimum, the smoking room must be directly exhausted to the outdoors, away from air intakes and building entry paths , with no recirculation of ETS contaning air to non smoking areas".

However the guidance does not specify the min distance required between the air intakes and the exhaust. Should we assume it's 25 feet (just like min distance between on-property smoking and air intakes/windows). What if the exhausted air is well filtered before exiting the building ?

Many thanks,