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to determine correct fit.
Even the same individual fit can vary over time due to weight loss or
gain, hair, and scars. Supervisors will schedule periodic fittings to
ensure that officers are diligent in observing these conditions. With
ideal wearing conditions, leakage may be as low as 1 percent. The
wearer must check facepiece fit according to manufacturer’s facepiece
fitting instructions each time respiratory protection is put on.
Inward leakage is one of the most important considerations in
selecting a facepiece. Since conditions such as growth of beard,
sideburns, a skull cap that projects under the facepiece, temple pieces
of eyeglasses, or the absence of one or both dentures may prevent
obtaining an effective face seal, they must be corrected so an effective
seal is obtained. Having a clean shaven area for an effective seal,
removal, or repositioning of a skull cap, use of an eyeglass adapter kit
(contact lenses may not be worn during fumigations), or inserting
dentures are some ways which must be used to correct these
conditions. Long sideburns, beards, and other facial hair in the
sealing area does prevent an effective seal even for positive pressure
masks, and is in violation of the Occupational Safety and Health
Administration (OSHA) regulations. Since the presence of facial hair in
the sealing area is in direct violation of the OSHA regulations and also
creates a significant safety hazard for the employees and their
co-workers, the sealing area of the face will be cleanly shaven to
permit an effective seal. All supervisors and employees must be
advised of this policy.
All personnel assigned fumigation and/or pesticide duties wear
SCBA’s during critical portions of treatment procedures and must not
have any condition(s) which prevent obtaining an effective face seal.
Individual face masks, available in small, medium, and large sizes
may be assigned.
Facepiece Fit Tests
The facepiece fit must be checked by the wearer each time the
respiratory protection is used. This will be done by following the
manufacturer’s facepiece-fitting instructions. Two simple field tests
are described below.
Important
The proper seal can also be attained with a hooded pressure demand SCBA
designed to fit over beards and glasses, such as, Survivair's PumaTM, which is
NIOSH-certified and OSHA-compliant.
Equipment
Special Problem
8-1-18 Treatment Manual 06/2004-01
PPQ
Negative Pressure Test
Close off the inlet opening of the facepiece or the canister or cartridges
by covering with the palm of the hand(s). Inhale gently so that the
facepiece collapses slightly and hold your breath for 10 seconds. If the
facepiece remains in a slightly collapsed condition and no inward
leakage of air is detected, the tightness of the respirator is probably
satisfactory.
Also, leakage can be detected by crushing an ampoule of isoamyl
acetate and passing it 1 to 2 inches around the seal area and
exhalation valve. In this case, leakage will be noted by a “banana-like”
odor in the facepiece. (See Isoamyl acetate in Appendix H, Reference
Guide to Commercial Suppliers of Treatment and Related Safety
Equipment.)
Positive Pressure Test
Close the exhalation valve and exhale gently into the facepiece. The
face fit is considered satisfactory if a slightly positive pressure can be
built up inside the facepiece without any evidence of outward leakage
of air along the seal. For most respirators, this method of leak testing
requires that the wearer remove the exhalation valve cover and then
be sure to carefully replace it after the test. The exhalation valve cover
must be replaced the correct way to prevent affecting the rubber valve.
Special Problem
Corrective Lenses With Full Facepiece
All facepieces will restrict, to some degree, the wearer’s vision. This
will increase accident potential. A proper seal cannot be established if
the temple bars of eyeglasses extend through the sealing edge of the
full facemask. A prescription spectacle kit for respirators is available
to correct this problem. All personnel who must wear prescription
eyeglasses must use this kit when wearing equipment with a full
facepiece.
It is APHIS policy to supply this adapter kit to all personnel requiring
one.
WARNING
Wearing of contact lenses in contaminated atmospheres with a respiratory
protection device is prohibited.
Equipment
Maintenance and Care
06/2004-01 Treatment Manual 8-1-19
PPQ
Eyeglasses With Half Facepiece
If corrective eyeglasses or goggles are required, they shall be worn so
　
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