Airlock: field math for abatement crews

Field notes

Airlock combines two field workflows: negative-air sizing from containment dimensions and target ACH, plus an estimator covering labor, disposal, containment materials, air monitoring, and markup. Its sample readout shows 960 ft³ producing 1,477 CFM, two machines, and 7.5 ACH. The page says derating can account for HEPA filter loading and duct loss, and that the tool remains usable offline after its first load. It cautions that the results are planning-level rather than project-specific engineering.