25 October 2004
Vertical Distribution Method. Design a drop ceiling with perforated plate
to form a plenum in accordance with paragraph 2-4.5.2.
Horizontal Distribution Method. Design the wall plenum to cover the
entire wall opposite the hoods. Size the open area of the perforated sheet for 10.16 m/s
(2,000 fpm) through the holes. See Figure 4-13 for more details.
Heating and Air Conditioning
. Design heating, air conditioning, and
humidity control according to MILHDBK 1003/3. Temper the replacement air to provide
a minimum winter design temperature of 18 oC (65 oF) and a maximum summer design
temperature of 24 oC (75 oF), with a maximum relative humidity of 50 percent. Do not
separate the air conditioning system from the replacement air system. See paragraph
2-6.2 for criteria on heat recovery systems. Do not re-circulate exhaust air.
SYSTEM CONTROLS. Design system controls in accordance with
paragraph 2-5 and the following:
a. Position an annunciator panel at the entrance to the space with a
potential for personnel exposure 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 the pressure varies from the specified range. Select
a timer that automatically resets if the problem is corrected within 60 seconds.
d. Trigger both visible and audible alarms if the system cannot correct
the difficulty within the allotted time.
SAFETY AND HEALTH CONSIDERATIONS. 29 CFR 1910 requires
specific criteria for the safety and health of operators. The physical nature of the work and
the use of protective clothing increase the potential for heat stress. Consider cooling the
replacement air to reduce this potential. Refer to NAVSEA S6340-AA-MMA-010, Otto
Fuel II Safety, Storage, and Handling Instructions for complete operational considerations.
Emergency Eyewash and Shower Stations. Provide combination
emergency eyewash and deluge showers in the immediate area of Otto Fuel II use.
Refer to UFC 3-420-01.