During the Phase I project, Emissol LLC designed, modeled, prototyped, and tested a novel honeycomb contactor smaller than typical honeycomb contactors. The contactor was rigorously tested both experimentally and in mathematical models. Good agreement was observed between the project’s test data and math-modeling results. It was observed that the novel contactor captures and removes carbon dioxide (CO2) at a high rate while also requiring approximately 40% less sorbent than typical honeycomb contactors. This was a significant finding, as for many DAC systems the sorbent cost could be 80–85% of the total capture cost.1 Given the cost-reduction capability of the novel contactor, the total direct air capture (DAC) cost could be reduced by approximately 30%.