The pressure in the common plenum of a Type A1 BSC is much lower (0.55 inches w.g. (137 Pa)) thanthe last certification (0.93 inches w.g. (232 Pa)). Both inflow and downflow velocities are belowspecification. The most likely problem isa. Failed speed control at maximumb. Cabinet airflow alarm needs to be reset.c. Loaded HEPA filtersd. Failed blower boote. Canopy connection static pressure of -0.14 inches w.g. (-35 Pa) set too high