Federal agency building managers are responsible for furnishing and installing suitable, uniform signs in the building, and in and around building entrance doorways and air intake ducts, reading ``No Smoking,'' ``No Smoking Except in Designated Areas,'' ``No Smoking Within 25 Feet of Doorway,'' or ``No Smoking Within 25 Feet of Air Duct,'' as applicable. [73 FR 77518, Dec. 19, 2008]