Airflow system for maintaining constant temperature inside a lead trailer and attached pup trailer

An airflow system adapted for receiving airflow from a refrigeration unit mounted on a front of a lead trailer, the airflow system also adapted for transferring and receiving airflow from a pup trailer pulled behind the lead trailer, the airflow system uses heated or cooled airflow discharged from the refrigeration unit inside the lead trailer to either heat or cool goods at a constant temperature, the goods stored inside the lead trailer and the pup trailer, the airflow system comprising:

• a modified air chute having a first end adapted for attaching to an air discharge opening in the refrigeration unit, said air chute having a second end attached to a rear door air manifold, said air manifold adapted for mounting on an upper portion of a rear door of the lead trailer, said rear door manifold connected to a lead airflow transfer hole in the rear door;
• a transfer tube, one end of said transfer tube connected to said lead airflow transfer hole, an opposite end of said transfer tube connected to a pup airflow intake hole in the front of the pup trailer, said intake hole is in an upper portion of the front of the pup trailer, said transfer tube for transferring airflow from the lead trailer to the pup trailer and circulating the airflow therethrough;
• and
• a return tube, one end of said return tube connected to a pup airflow return hole in a lower portion of the front of the pup trailer, an opposite end of said return tube connected to a lead airflow return hole in a lower portion of the lead trailer's rear door, said return tube returning airflow from the pup trailer to the lead trailer for circulating the airflow through the lead trailer and recirculating the airflow back to the refrigeration unit.

A method for heating and cooling a lead trailer and a pup trailer pulled behind the lead trailer using heated or cooled airflow discharged from a refrigeration unit, the refrigeration unit mounted on the front of the lead trailer, the airflow maintaining goods stored inside the lead trailer and pup trailer at a constant temperature, the steps comprising:

• conveying the airflow from the refrigeration unit through an air chute to a rear of the lead trailer;
• transferring the airflow from the air chute through a lead airflow transfer hole in a read door of the lead trailer and to a transfer tube;
• conducting the airflow through the transfer tube and through a pup airflow intake hole in a front of the pup trailer;
• circulating the airflow through the pup trailer and back through a pup airflow return hole in the front of the pup trailer;
• conducting the return airflow through the pup airflow return hole to a return tube;
• returning the return airflow through the return tube and through a lead airflow return hole in the rear door of the lead trailer;
• and
• circulating the return airflow through the lead trailer and recirculating the airflow back to the refrigeration unit.