Size Selection; Respirator Fit Test; Quantitative Test; Qualitative Test - MSA G1 SCBA Operating Manual

3

Size Selection

WARNING!
The facepiece will not provide protection unless all inhaled air is drawn through the SCBA.
NOTE: Individuals who wear eyeglasses must use the G1 spectacle kit to guarantee a correct fit. Ordi-
nary eyeglasses cannot be worn under the facepiece.
Regardless of facial dimensions and respirator sizing charts, users must do an actual qualitative or
quantitative respirator fit test to make sure the correct respirator size is selected.
(1) Do a fit test of the respirator size relative to your facial features and dimensions. Ask the safety
administrator or program manager for help selecting the initial size to try.
(2) Don the facepiece. Refer to Section 6.4 "Donning the Facepiece" for instructions.
(3) Do a negative-pressure seal test. Refer to Section 6.4.1 "Testing the Negative Pressure Seal" for
instructions.
(4) If the facepiece does not pass the negative-pressure seal test or feels uncomfortable, try the next
nearest size relative to your face.
(5) Passing the negative-pressure seal test does not verify that the size is correct. Do a qualitative
or quantitative respirator fit test to verify the size. If the respirator passes a negative-pressure
seal test but does NOT pass a respirator fit test, try the next nearest size.
If other leakage than from the facial seal occurs, find and correct the condition, then do the test again.
3.1

Respirator Fit Test

WARNING!
Do quantitative or qualitative respirator fit tests routinely for each wearer of this respirator. Obey all

specified warnings and limitations. Failure to do so can result in serious personal injury or death.
Make sure the probe does not contact the face during fit testing. Failure to do so can result in false

protection factor readings.
Use the instructions provided with the MSA Quik Chek Kit (P/N 805078) to perform respirator fit
testing.

3.1.1 Quantitative Test

A fit factor of at least 500, based on ambient aerosol fit test methods or equivalent, is required before
any type of respirator is assigned to an individual.

3.1.2 Qualitative Test

Only validated protocols are acceptable. The respirator must pass a test designed to assess a fit factor
of at least 500.
G1 SCBA 2018 Edition
Size Selection
US
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