System and method for preventing growth of mold or mildew in a building

Abstract

A system for preventing growth of mold and mildew in buildings comprises an air diffusion device covering an opening of a heating ventilation and air conditioning duct. A heating cable is affixed to a flange of the air diffusion device that extends along a periphery of a screen covering the opening. The cable is activated to heat the surfaces of the air diffusion device to a temperature above dew point and prevent condensation.

1 . A system for preventing growth of mold and mildew in a building or air conditioning system for a building, comprising: 
 a. at least one air diffusion device covering an opening in a duct of a heating ventilation or air conditioning system of a building through which conditioned air is discharged, and the air diffusion device having a screen covering the opening and a flange extending along at least a portion of the periphery of the screen; and,    b. at least one electric heating cable affixed to a surface of the flange of the air diffusion device and surrounding at least a portion of the screen for heating the air diffusion device to a temperature above a dew point of ambient air in the building.    
   
   
       2 . The system of  claim 1  wherein the air diffusion device is mounted on a wall having an opening in fluid communication with the duct.  
   
   
       3 . The system of  claim 2  wherein the air diffusion device includes a first flange fastened to the wall and a second flange disposed substantially perpendicular to the first flange for alignment of the air diffusion device where the duct and the heating cable is capable of being attached to either the first flange or second flange.  
   
   
       4 . A method for preventing the growth of mold or mildew in a building, comprising the steps of: 
 a. mounting at least one air diffusion device over an opening in of a duct of a heating, ventilation or air conditioning system of a building; and,    b. elevating a temperature of a surface of the air diffusion device above a predetermined dew point temperature of ambient air in the building.    
   
   
       5 . The method of  claim 4  wherein in the temperature elevating step comprises applying an electrical heat source to a surface of the air diffusion device.  
   
   
       6 . The method of  claim 4  wherein the step of elevating the temperature includes applying an electric heating cable to a surface of the air diffusion device and activating the heating cable with an electrical current to increase a temperature of the surface of the air diffusion device.  
   
   
       7 . The method of  claim 4  wherein the step of elevating the temperature includes elevating the temperature of one or more surfaces of the air diffusion device above the dew point temperature of the surrounding environment.