Fire damper

Abstract

A fire damper comprising a housing, a louver member rotationally engaged within the housing, the louver member having a substantially gas tight seal with the housing when the louver member is in a closed position, a biasing member disposed outside of the housing and engaged with the louver member for moving the louver member from an open position and holding the louver member in the closed position, a temperature sensitive member releasably connected to the louver member, the temperature sensitive member for releasing the louver member from the open position at a predetermined temperature, and the louver member further comprising insulation material to control heat transfer through the louver member for a predetermined period of time.

1 . A fire damper comprising:
 a housing;   a louver member rotationally engaged within the housing, the louver member having a substantially gas tight seal with the housing when the louver member is in a closed position;   a biasing member disposed outside of the housing and engaged with the louver member for moving the louver member from an open position and holding the louver member in the closed position;   a temperature sensitive member releasably connected to the louver member, the temperature sensitive member for releasing the louver member from the open position at a predetermined temperature; and   the louver member further comprising insulation material to control heat transfer through the louver member for a predetermined period of time.   
   
   
       2 . The fire damper as in  claim 1 , wherein the louver member comprises a first portion and a second portion with the insulation material disposed therebetween. 
   
   
       3 . The fire damper as in  claim 1 , wherein the biasing member comprises a flat band spring. 
   
   
       4 . The fire damper as in  claim 1 , wherein the housing further comprises a transition means for connecting to ductwork. 
   
   
       5 . The fire damper as in  claim 1 , wherein the housing comprises metal. 
   
   
       6 . The fire damper as in  claim 1 , wherein the temperature sensitive member melts in the range of approximately 165° F. to approximately 286° F. 
   
   
       7 . The fire damper as in  claim 1  further comprising a stop on the housing that is engageable with the louver member whereby the louver member can be held in a predetermined closed position which is substantially gas tight. 
   
   
       8 . The fire damper as in  claim 1 , wherein the fire damper louver member is normally open allowing gas flow therethrough.