AAF International SAH User Manual

Page 15

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.