CAUTION
ENSURE THAT CLEANING SOLU-
TION DOES NOT ENTER THE IN-
HALATION/EXHALATION VALVE
ASSEMBLY.
Moisten a gauze pad with the cleaning solution
and wash the facepiece and housing assembly both
internally and externally.
After washing, the mask should be thoroughly
and repeatedly rinsed with warm water.
NOTE: Another alternate sanitizer,
Aerosol Antiseptic Spray SBT-12 (di-
bromosalicyl bromanicide), manufactured
by Lever Brothers, Inc., can be used.
Directions for use are indicated on the
container.
After all parts are dry, disinfect by using a
gauze pad or other lint-free wipers, with a solution
of 2 tablespoons of chlorine bleach per gallon of
water; rinse with clear water and air dry. Be
certain disinfectant reaches inner crevices of the
faceform.
To clean the delivery hose, wash it with a
cleaning solution and rinse it with clear water.
Allow all parts to air dry.
When cleaning the inhalation/exhalation valve
assembly, it will be necessary for you to obtain
a container just large enough to partially submerge
the valve. Fill the container half full of
benzalkonium chloride solution, MIL-B-37451, or
a solution of 70 percent isopropyl alcohol and 30
percent distilled water.
239.423
Figure 4-27.—Removing locking nut.
By using a valve wrench, as shown in figure
4-27, unscrew the valve nut and remove the
locking nut, bearing washer, and isolation washer
from the inside of the mask. This will allow the
valve, sealing washer, delivery tube, and
connector assembly to be removed as a unit from
the outside of the mask. Hold the base portion
of the valve and submerge the operating portion
of the valve into the solution. Normally, only a
few seconds are required to remove any stains and
residue. For stubborn residues, use a cotton swab
saturated with benzalkonium chloride and rub
lightly to remove. Gently shake excess solution
from oxygen valve and allow it to air dry
completely.
4-32
