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they do not affect the fit of the facepiece. Proper selection of equipment
will minimize or avoid this problem.
Use in Low Temperatures
The use of full facepieces at low temperatures presents problems such
as poor visibility and freezing of exhalation valves. All full facepieces
are designed so that the incoming fresh air sweeps over the inside of
the lens to reduce fogging. This makes it possible to wear a full
facepiece in ordinary room temperatures without severe fogging.
Antifog compounds can be used to coat the inside of the lens to
prevent fogging at room temperatures and down to temperatures
approaching 32°F. However, below 0°F, antifog compounds will not
prevent severe fogging.
Although such instances are not usually encountered, the employee
should be aware that it is dangerous to work at temperatures near
freezing and below when using respirators not designed for such use.
When using air supplied respirators, the high-pressure connections
may leak because of metal contraction at low temperatures. It is
important to remember that connections should not be over tightened
since they may break when temperatures return to normal.
Communications
The conventional respirator exhalation valve will provide a pathway for
some speech transmission over short distances in relatively quiet
areas. Talking can induce facepiece or component leakage and,
therefore, should be limited while wearing a respirator, especially
those with half-facepiece.
Maintenance and Care
Equipment must be properly maintained to retain its effectiveness. A
program for maintenance and care include the following basic
services:
◆ Inspection for defects (including leak checks)
◆ Cleaning and disinfecting
◆ Repairs
◆ Storage
◆ Respirable air for SCBA
Equipment
Maintenance and Care
8-1-20 Treatment Manual 06/2004-01
PPQ
Inspection
The user shall inspect the respiratory equipment before and after each
use. Respiratory equipment that is not routinely used, but is kept
ready for emergency use, shall be inspected at least monthly to ensure
that it is in satisfactory working condition. SCBA air cylinders shall be
fully charged according to the manufacturer’s instructions.
Inspection shall include:
1. Check tightness of connections.
2. Check the condition of the facepiece, headbands, valves,
connecting tube, and any canisters or cartridges.
3. Check rubber or other elastic parts for pliability and signs of
deterioration.
4. Check the regulator and the warning device to determine proper
functioning before each use.
5. Check for leaks.
Keep a record of inspection dates and findings in the unit carrying
case.
Cleaning and Disinfection
Clean and disinfect routinely used equipment after each use and those
not routinely used as necessary to ensure that proper protection is
provided for the wearer. The following is recommended for cleaning
and disinfecting respiratory protection devices:
1. Remove any filters, cartridges, or canisters.
2. Wash facepiece and breathing tube with a cleaner-disinfectant or
detergent solution (see following paragraphs). Use a hand brush
to facilitate removal of dirt.
3. Rinse completely in clean, warm water.
4. Air dry in a clean area.
5. Clean other parts as recommended by manufacturer.
6. Inspect valves, headstraps, and other parts. Replace with new
parts when defective. Stretching and manipulating rubber
elastomer parts with a massaging action will keep them pliable
and flexible and prevent them from warping or sticking during
storage.
7. Insert new filter, cartridge, or canister in the unit. Make sure seal
is tight.
Cleaner-disinfectant solutions containing a bactericidal agent
(generally a quaternary ammonium compound) are available.
Equipment
Maintenance and Care
06/2004-01 Treatment Manual 8-1-21
PPQ
Commercial products must be used according to the label to obtain
the proper solution. However, different concentrations of the
quaternary ammonium salt are required for various hardness of water
to obtain a satisfactory disinfectant solution. Dermatitis may occur if
the quaternary ammonium compounds are not completely rinsed from
the facepiece and associated parts.
Strong cleaning and disinfecting can damage parts. Avoid
temperatures above 120°F and vigorous mechanical agitation.
Solvents which affect elastomer or rubber parts must be used with
caution.
Respiratory protective equipment may be contaminated with toxic
materials such as organo-phosphates or other pesticides. If the
contamination is light, normal cleaning procedures should provide
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