Developed with aerospace engineering principals and backed by the National Science Foundation (NSF), GigaDAC is an airflow solution to the airflow problem of Direct Air CO2 Capture (DAC). By getting airflow right, our results demonstrate a system at 1/3rd the cost to build, 1/6th the cost to operate, and less than half the cost to regenerate. With this, we can profitably sell carbon offsets at below $100 per ton and tap into the lucrative 45Q marketplace.