States that Sick Building Syndrome (SBS) contamination in occupied office buildings may result in the imposition of liability upon the ventilation system designer. To mitigate exposure to SBS liability, designers may be compelled to warn that certain energy conservation air-handling systems may cause SBS injuries. Assesses the designer's duty and potential liability when confronted with a design that may result in an SBS injury.KEYWORDS: Offices, sick buildings, designing, designers, liability.