Plastic heating duct connectors

A connector made of plastic for connecting a terminal end of a heating duct to a heating duct board, the connector comprising:

• at least one annular cylindrical portion with an outer surface and a maximum outer diameter;
• a flange extending radially outwardly from the outer surface of the annular cylindrical portion, the flange having a dimension greater than the maximum diameter forming an abutment against which a lower edge of the heating duct board abuts, and having at least one rectangular sleeve for receiving a zip tie;
• retention means for securing the connector to the heating duct board with the heating duct board encircling the annular cylindrical portion and being in abutting engagement with the flange, wherein the retention means comprises at least one zip tie, mounted through the at least one rectangular sleeve of the flange and through the flange, and engageable in a mouth of the heating duct board to which the connector is secured.