Patent ID: 7125332

Claim:
A ceiling damper system, comprising: a damper housing having an inlet opening to accept air from a heating, ventilation and air conditioning (HVAC) system, and an outlet opening to supply the HVAC air to a room; a damper mechanism to substantially block the flow of air through said damper housing when the temperature around said housing reaches a predetermined level; two or more cross members, each of which is mounted between fixed points in a ceiling, said cross members arranged to support and hold said damper housing, each of said cross members comprising one or more substantially horizontal surfaces, and said damper housing comprising two or more substantially horizontal surfaces, wherein said damper housing rests on said cross members with said damper housing horizontal surfaces on said cross member horizontal surfaces, wherein each of said cross members is elongated and said damper housing comprises a lower section, each of said cross members running along a respective lower edge of said lower section, wherein each of said members comprises a boot rail with an S-shaped cross section having a first curved section and a flat section, each edge of said lower section having an edge lip that fits within the first curved section of its respective cross member.