This kit is required for MasterTemp heaters that are installed indoors where combustion air supply might be to low. With this kit, the outside air is drawn through a 3" PVC duct directly into the MasterTemp Heater to provide the correct amount of air supply for proper operation.

Includes: Heater Panel with Cut-Out Air Orifice Adapter Short Length of 3" PVC Pipe 3" PVC Union Screened Termination Cap.