The document describes a design by Dr. N. Sai Bhaskar Reddy for a biochar retort with two chimneys that uses primary and secondary air. The design is for a biochar retort with two chimneys that allows for primary and secondary air flow for improved pyrolysis of biomass into biochar. The biochar retort was designed by Dr. N. Sai Bhaskar Reddy, who is the CEO of GEO MAGH.