Backdraft damper with angled frame for terminal unit

Abstract

A terminal unit for a heating, ventilation, and/or air conditioning (HVAC) system, including: a housing including a base wall, a first chamber configured to receive a first air flow, and a second chamber configured to receive a second air flow; an internal wall disposed within the housing and extending between the first chamber and the second chamber, wherein the internal wall includes an opening formed therein, and wherein the second air flow selectively flows through the opening from the second chamber to the first chamber along an air flow path; and a damper door rotatable relative to the internal wall and configured to substantially prevent the first air flow from flowing through the opening from the first chamber to the second chamber in a closed position, the damper door positioned at an angle relative a vertical plane that is perpendicular to the base wall.

What is claimed is: 
     
         1 . A terminal unit for a heating, ventilation, and/or air conditioning (HVAC) system, comprising:
 a housing comprising a base wall, a first chamber configured to receive a first air flow, and a second chamber configured to receive a second air flow;   an internal wall disposed within the housing and extending between the first chamber and the second chamber, wherein the internal wall comprises an opening formed therein, and wherein the second air flow selectively flows through the opening from the second chamber to the first chamber along an air flow path; and   a damper door rotatable relative to the internal wall and configured to substantially prevent the first air flow from flowing through the opening from the first chamber to the second chamber in a closed position, the damper door positioned at an angle relative a vertical plane that is perpendicular to the base wall.   
     
     
         2 . The terminal unit of  claim 1 , wherein the internal wall is positioned at an oblique angle relative to the base wall. 
     
     
         3 . The terminal unit of  claim 2 , wherein the damper door is rotatably coupled to the internal wall. 
     
     
         4 . The terminal unit of  claim 2 , wherein the oblique angle is between 80 degrees and 89.5 degrees. 
     
     
         5 . The terminal unit of  claim 1 , wherein the opening is a first opening and further comprising a damper collar having mounting configured to be coupled to the internal wall, a collar wall positioned at the angle relative to the internal wall, and a second opening extending through the damper collar, the second opening in fluid communication with the first opening. 
     
     
         6 . The terminal unit of  claim 5 , wherein the damper door is rotatably coupled to the damper collar. 
     
     
         7 . The terminal unit of  claim 5 , wherein the angle is between 0.5 degrees and 10 degrees. 
     
     
         8 . The terminal unit of  claim 1 , further comprising a blower is positioned within the second chamber, the blower configured to selectively force the second air flow from the second chamber to the first chamber through the opening. 
     
     
         9 . The terminal unit of  claim 8 , wherein when the blower is operating, the second air flow is forced through the opening and thereby mixes with the first air flow to adjust a characteristic of the first air flow, and wherein when the blower is not operating, the damper door is the closed position. 
     
     
         10 . The terminal unit of  claim 1 , wherein the damper door is retained in the closed position by gravity when the second air flow is not flowing therethrough and moved against gravity when the second air flow is flowing therethrough, such that the second air flow is forced from the second chamber to the first chamber. 
     
     
         11 . A terminal unit for a heating, ventilation, and/or air conditioning (HVAC) system, comprising:
 a housing comprising a first chamber configured to receive a first air flow and a second chamber configured to receive a second air flow;   an internal wall disposed within the housing and extending between the first chamber and the second chamber, wherein the internal wall comprises a first opening formed therein;   a damper collar comprising a mounting surface configured to be coupled to the internal wall, a collar wall positioned at an angle relative to the internal wall, and a second opening extending through the damper collar, the second opening in fluid communication with the first opening; and   a damper door rotatably attached to the damper collar and configured to abut the collar wall to substantially cover the second opening in a closed position.   
     
     
         12 . The terminal unit of  claim 11 , wherein the angle is between 0.5 degrees and 10 degrees. 
     
     
         13 . The terminal unit of  claim 11 , further comprising a blower is positioned within the second chamber, the blower configured to selectively force the second air flow from the second chamber to the first chamber through the first opening and the second opening. 
     
     
         14 . The terminal unit of  claim 13 , wherein when the blower is operating, the second air flow is forced through the first opening and the second opening and thereby mixes with the first air flow to adjust a characteristic of the first air flow, and wherein when the blower is not operating, the damper door is the closed position. 
     
     
         15 . The terminal unit of  claim 11 , wherein the damper door is retained in the closed position by gravity when the second air flow is not flowing therethrough and moved against gravity when the second air flow is flowing therethrough, such that the second air flow is forced from the second chamber to the first chamber. 
     
     
         16 . A terminal unit for a heating, ventilation, and/or air conditioning (HVAC) system, comprising:
 a housing comprising a base wall, a first chamber configured to receive a first air flow, and a second chamber configured to receive a second air flow;   an internal wall disposed within the housing and extending between the first chamber and the second chamber, wherein the internal wall is supported by the base wall at an oblique angle, and wherein the internal wall comprises an opening formed therein; and   a damper door rotatable relative to the internal wall and configured to substantially cover the opening in a closed position.   
     
     
         17 . The terminal unit of  claim 16 , wherein the oblique angle is between 80 degrees and 89.5 degrees. 
     
     
         18 . The terminal unit of  claim 16 , further comprising a blower positioned within the second chamber, the blower configured to selectively force the second air flow from the second chamber to the first chamber through the opening. 
     
     
         19 . The terminal unit of  claim 18 , wherein when the blower is operating, the second air flow is forced through the opening and thereby mixes with the first air flow to adjust a characteristic of the first air flow, and wherein when the blower is not operating, the damper door is the closed position. 
     
     
         20 . The terminal unit of  claim 16 , wherein the damper door is retained in the closed position by gravity when the second air flow is not flowing therethrough and moved against gravity when the second air flow is flowing therethrough, such that the second air flow is forced from the second chamber to the first chamber.