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carefully fitted to the wearer’s face. The time during which protection
is provided is dependent on canister or cartridge type concentration of
the contaminant, and the wearer’s respiratory rate.
A rise in canister or cartridge temperature indicates that a gas or
vapor is being removed from the inspired air. However, this
characteristic should not be relied on as an indicator of canister
performance. An uncomfortably high canister temperature usually
indicates a high concentration of gas or vapor and requires an
immediate return to fresh air.
Particulate Removing Respirators
Particulate removing respirators may be used only to protect against
nonvolatile particles. No protection is afforded against gases and
vapors unless a special combination filter and chemical cartridge
(canister) system is used. The filter or cartridge shall be replaced when
breathing becomes difficult due to plugging by retained particles.
Combination respirators using both chemical and mechanical filtering
systems are used for dual or multiple exposures to dust and vapors.
Normally, filters used for removing dust, mist, or other particulates
plug up before the chemical cartridge is exhausted. Both filter and
chemical cartridge should be replaced at the same time.
Selection of Respiratory Protection
Work time, including the time necessary to enter or leave a
contaminated area, determines the length of time for which
respiratory protection is needed. The selection of respirators must be
based on all hazards to which the wearer may be exposed.
The only unit with an adequate warning device is the SCBA. The SCBA
is equipped with a pressure gauge and audible alarm device. Canisters
may have a window indicator which only indicates the presence of
moisture. Because canister and cartridge respirators have no
indication of remaining service life, used canisters and cartridges
should be replaced after each use.
The more active the wearer is, the more rapid his breathing. This
shortens the usable working time of all types of respirators. High
breathing resistance of air-purifying respirators under conditions of
heavy work can result in distressed breathing.
Equipment
Use of Respirator Protection
8-1-16 Treatment Manual 06/2004-01
PPQ
Use of Respirator Protection
Assignment of Respiratory Protection
Every effort will be made to avoid the need for respirators. The
supervisor issuing respirators shall be adequately trained to ensure
that the correct respirator is issued for each type of possible pesticide
exposure. Pesticide labels must be followed regarding respirator use
unless more rigid standards are specified by PPQ.
If an officer will use a respirator, the supervisor must ensure that a
physician or other licensed health care professional apply one or more
of the following tests to determine the officer’s fitness to use a
respirator:
◆ Pulmonary Function Test
◆ Chest X-ray
◆ EKG
◆ Examination of nasal passages
Any such examination should be requested and reported as outlined
in Section 7.2.8 of the Animal and Plant Health Inspection Service
(APHIS) Safety and Health Manual. Use APHIS Form 29 for this
purpose. Only a physician or other licensed health care professional
can judge whether an officer is physically able to wear a respirator.
Supervisors must ensure that employees who use respirators complete
a medical review every 2 years or more frequently if there is a
significant change in the medical or physical condition of the officer.
Procedures for conducting this review are outlined in Change No. 5 of
the APHIS Safety and Health Manual, dated 2/7/86.
Use in Dangerous Atmospheres
In situations where employees may be overcome by a toxic or
oxygen-deficient atmosphere, at least one additional person qualified
in the use of respirators (such as the commercial applicator) shall be
present. The commercial applicator and the employee should
cooperate to limit the likelihood of exposure of both individuals at one
time. All precautions shall be followed to prevent exposure to any
individual at a treatment site. Should exposure occur and an employee
be overcome by a toxic atmosphere, rescue should not be attempted
without the SCBA.
Equipment
Use of Respirator Protection
06/2004-01 Treatment Manual 8-1-17
PPQ
Facepiece Fitting
All respirator or SCBA wearers must receive prior fitting instructions
from their supervisors, fumigation trainers, or others experienced in
these procedures. By demonstrations and practice, the wearer will
know how to wear the respirator, how to make adjustments, and how
　
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