Dual layer door

Abstract

An airflow door assembly for an HVAC blower. The assembly includes a primary door and a sub-door. The primary door is configured to be pivotably mounted in the HVAC blower. The primary door includes a first end, a second end, and a wall extending between the first end and the second end. The primary door defines an opening in the airflow door assembly. The sub-door is pivotably mounted to the primary door and is movable between a closed position and an open position. In the closed position the sub-door is seated within the opening to restrict airflow through the opening. In the open position the sub-door is rotated out from within the opening to permit airflow through the opening.

What is claimed is: 
     
         1 . An airflow door assembly for an HVAC blower comprising:
 a primary door configured to be pivotably mounted in the HVAC blower, the primary door including a first end, a second end, and a wall extending between the first end and the second end, the primary door defining an opening in the airflow door assembly; and   a sub-door pivotably mounted to the primary door and movable between a closed position in which the sub-door is seated within the opening to restrict airflow through the opening, and an open position in which the sub-door is rotated out from within the opening to permit airflow through the opening.   
     
     
         2 . The assembly of  claim 1 , wherein the primary door includes a shaft that is pivotably mounted to the HVAC blower, the HVAC blower defining at least one inlet and at least one outlet. 
     
     
         3 . The assembly of  claim 2 , wherein the at least one inlet, the primary door, the sub-door, and the at least one outlet are selectively in an airflow path. 
     
     
         4 . The assembly of  claim 2 , wherein a case of the HVAC blower includes a filter in an airflow path with the at least one inlet and the at least one outlet. 
     
     
         5 . The assembly of  claim 1 , wherein the primary door and sub-door pivot about a common axis. 
     
     
         6 . The assembly of  claim 1 , wherein the primary door has projecting tabs extending about a perimeter of the primary door. 
     
     
         7 . The assembly of  claim 6 , wherein the projecting tabs have a sealing material on at least one side of the projecting tabs. 
     
     
         8 . The assembly of  claim 7 , wherein the sealing material includes an elastomer. 
     
     
         9 . The assembly of  claim 7 , wherein the sealing material includes a foam packing. 
     
     
         10 . The device of  claim 1 , wherein the sub-door has a sealing material about a perimeter thereof. 
     
     
         11 . The assembly of  claim 1 , wherein the sub-door has a non-planar lip about a perimeter. 
     
     
         12 . An airflow door assembly for an HVAC blower comprising:
 a primary door including:
 a first frame and a second frame both extending from a pivot axis of the primary door; and 
 a wall extending across the first frame, the wall partially defining an opening of the primary door; and 
   a sub-door pivotably mounted to the primary door at the pivot axis and configured to pivot independently of the primary door between a closed position in which the sub-door is seated within the opening and an open position in which the sub-door is outside of the opening.   
     
     
         13 . The assembly of  claim 12 , further comprising a filter in an airflow path with the primary door. 
     
     
         14 . The assembly of  claim 12 , wherein the first frame and second frame have projecting tabs extending from a periphery thereof. 
     
     
         15 . The assembly of  claim 14 , wherein the projecting tabs have a sealing material on at least one side of the projecting tabs. 
     
     
         16 . The assembly of  claim 12 , wherein the sub-door has a perimeter sealing feature. 
     
     
         17 . The assembly of  claim 16 , wherein the perimeter sealing feature is a non-planar lip. 
     
     
         18 . The assembly of  claim 16 , wherein the perimeter sealing feature is a sealing material. 
     
     
         19 . An airflow door assembly for an HVAC blower case comprising:
 an HVAC blower case defining a first inlet, a second inlet, a sealing section, an outlet, and a blower section; and   a door assembly including:
 a primary door having a first end, a second end, and an inner wall extending between the first end and the second end, the inner wall partially defining an opening of the primary door; 
 a sub-door mounted to the primary door between the first end and the second end, both the primary door and the sub-door are individually pivotable about a common pivot axis, the sub-door is movable between a closed position in which the sub-door is seated within the opening and an open position in which the sub-door is outside of the opening; 
   wherein:
 in a first position the primary door is proximate to the second inlet and the sub-door is open to direct airflow from the first inlet to the outlet and restrict airflow from the second inlet to the outlet; 
 in a second position the primary door is proximate to the first inlet and the sub-door is open to direct airflow from the second inlet to the outlet and restrict airflow from the first inlet to the outlet; and 
 in a third position the primary door is intermediate of the first inlet and the second inlet and the sub-door is closed to direct airflow from both the first inlet and the second inlet to the outlet and restrict airflow between the first and the second inlets. 
   
     
     
         20 . The assembly of  claim 19 , wherein the primary door includes sealing tabs between the first end and the second end.