AAF International SAH - Manual (Page 15)

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3.11 Pressure Gauge: It is recommended that pressure gauges be
installed across the filter system to indicate when the particulate filters,
being the prefilter, after-filter, and high efficiency filters, need to be
replaced. The pressure gauge will register the pressure differential
across each filter bank. As the particulate filter loads with dirt the
resistance to the airflow, and consequently, the pressure across the
filter will increase. The pressure across the gas-phase chemical filter(s)
will remain constant since these filters collect gas molecules and not
particulate. Pressure gauges across the gas-phase filter banks are
typically not required but may be supplied if specifically requested. The
pressure gauges are normally ordered as part of the housing and will
be supplied in one of the installations shown on the right.
Side Access Housing with wall-mounted gauges.
Side Access Housing with top mounted gauges.
3.10 Latch SAH Doors: Now close and latch the SAH doors as shown.