25 October 2004
System Controls. Design system controls in accordance with paragraph
2-5 and the following:
a. Position the annunciator panel at the entrance to the dirty space so
operators can monitor operating gauges.
b. Install static pressure sensors at locations that are representative of
average static pressure in each controlled space. This will ensure that
desired differential pressures are maintained.
c. Trigger a timer if pressure varies from the specified range. Select
timer that automatically resets if the problem is corrected within
d. Trigger both visible and audible alarms if the system cannot correct
the difficulty within allotted time. Install multiple alarm beacons if
operator's view is obscured during delagging. Monitor the shop's negative
pressure continuously, using strip chart recorder, so the operator can
detect any pressure changes.
e. Interlock the hand tool power supply with the ventilation system's on-
off switch. This will prevent the use of hand tools without ventilation
SAFETY AND HEALH CONSIDERATIONS. Consult the local industrial
hygienists for required respiratory protection in accordance with 29 CFR 1910.1001 (f)
and (g), 29 CFR 1915.1001(g) and (h). See paragraph 2-7.3 for additional information.