E. H. Berger Division Scientist, Occupational Health & Environmental Safety Division E. H. Berger...
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E. H. BergerE. H. Berger
Division Scientist,Division Scientist,Occupational Health & Environmental Safety DivisionOccupational Health & Environmental Safety Division
E. H. BergerE. H. Berger
Division Scientist,Division Scientist,Occupational Health & Environmental Safety DivisionOccupational Health & Environmental Safety Division
Fitting EFitting E••AA••RRTMTM
Foam EarplugsFoam EarplugsFitting EFitting E••AA••RRTMTM
Foam EarplugsFoam Earplugs
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Fitting E•A•R Foam Earplugs
References: AIHA Noise Manual, Ch. 10, p. 398-412 EARLog #19
Tips & Tools for Fitting E-A-R Foam Earplugs
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Otoscopic Inspection
•Examine around ear and in earcanal
•How to brace otoscope
•Proper pinna pull and direction to insert tip
•Earlight is excellent alternative
•Need only examine to earplug depth
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The Occlusion Effect as a Fitting Aid
Occluded Volume
300 cm30.2 cm3
• Listen to OE using finger
• “Boom beat”
• Fit one ear and listen
• Fit both ears and listen
•Works for earmuffs too
Occ
lusi
on
Eff
ect
(dB
)
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Rolling and Inserting Foam Earplugs
• Tight compression (EXTREMELY TIGHT!) and crease- and wrinkle-free
•Practice with Roll Model
• Instructor fits off-hand ear
•Guide direction ofpinna pull
•Student fits other ear
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Checking the Fit of Foam Earplugs•Occlusion effect - present,
but not too much
•Position relative to tragus
•Remove and “read” plugs
• “Crummy earmuff” test
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Considerations re Deep Fitting
•Give the plug a chance to expand - it gets more comfortable as it expands and shortens
•Alternative options to facilitate removal of overly deep fittings>Golf tee>Longer plug>Corded plugs>Tweezers
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Three Advantages of a Better Fit•More and flatter attenuation (listen in noise)
• Less occlusion effect (provide demonstration)
•Better comfort
Less OE More OE
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Use of an Eargage to Size Canals
•Approximate sizing
•Provides indicator for beginner
•Useful for 2-sized foam earplugs