Louver integrated design for fan module

Abstract

A fan assembly is disclosed to prevent reverse air flow when the fan stops working. The assembly has a fan module including an intake end, a motor casing and a motor propelling a fan. A louver module has a plurality of slats having an open position to allow air flow and a closed position to block air flow. The louver module is coupled to the motor casing to provide a seal between the louver module and the motor casing.

What is claimed is: 
     
         1 . A integrated fan assembly, comprising:
 a fan module including an intake end, a motor casing, and a motor propelling a fan; and   a louver module having a plurality of slats having an open position to allow air flow and a closed position to block air flow, wherein the louver module is coupled to the motor casing to provide a seal between the louver module and the motor casing.   
     
     
         2 . The assembly of  claim 1 , wherein the louver module includes a rear frame having a handle. 
     
     
         3 . The assembly of  claim 1 , wherein the plurality of slats is forced to the closed position when air flow occurs from the louver module to the intake end. 
     
     
         4 . The assembly of  claim 1 , further comprising a front frame coupled to the motor casing. 
     
     
         5 . The assembly of  claim 1 , further comprising a grill attached to the louver module for transmission of air flow. 
     
     
         6 . The assembly of  claim 1 , wherein the plurality of slats is vertically oriented and rotatably attached to top and bottom members of the louver module. 
     
     
         7 . The assembly of  claim 1 , wherein the plurality of slats is horizontally oriented and rotatably attached to side members of the louver module. 
     
     
         8 . A fan louver module for connection with a motor casing of a fan, the fan louver module comprising:
 a frame having side walls and top and bottom walls; and   a plurality of slats mounted in the frame, the plurality of slats having an open position to allow air flow though the frame and a closed position blocking air flow through the frame;   wherein the frame has approximately the same cross section area as a front end of the motor casing, and wherein the frame is attachable to the motor casing of the fan to provide a seal between the motor casing and the frame.   
     
     
         9 . The fan louver module of  claim 8 , wherein the plurality of slats is forced to the closed position when air flow occurs from the frame to the motor casing. 
     
     
         10 . The fan louver module of  claim 8 , wherein the frame of the louver module includes a first attachment point that may be joined with a corresponding attachment point on a front frame of the fan. 
     
     
         11 . The fan louver module of  claim 8 , wherein the plurality of slats is vertically oriented and rotatably attached to top and bottom members of the frame. 
     
     
         12 . The fan louver module of  claim 8 , wherein the plurality of slats is horizontally oriented and rotatably attached to the side members of the frame.