Builds · what we've made and how it's going

Real boxes, real parts, real numbers

Each build lists exactly what's in it. Predictions come from the same lab fan curves and verified filter data the planner uses; measured results get added as each box is tested.

How each build gets measured

Same phone meter, same spot, 3 ft from the box, 30–60 second average, fan off then on. Airflow from a vane anemometer across the filter faces, or a differential pressure gauge across the filter. Clean-air rate from a particle decay test: light a match, let the PM2.5 sensor peak, time how fast it falls with the box on versus off.