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• Ear-muffs must be worn at all times in noisy areas and be fitted prior to entering the noise area.
• Remember that ear-muffs can generally shut out external ambient sounds, such as warning shouts, alarms and other
important signals. Therefore, be especially watchful of your surroundings when wearing ear-muffs.
• For noise environments dominated by frequencies below 500 Hz, the C-weighted environmental noise level must be
used.
• Improper fit of this device will reduce its effectiveness in attenuating noise.
• This product may be adversely affected by certain chemical substances. For further information, contact the
manufacturer.
• An appropriate hearing conservation program must be utilized that includes adequate monitoring and audiometric
testing to ensure effective hearing protection. Improper use of the ear-muffs or failure to conduct adequate monitoring
and testing can result in hearing loss or other serious personal injury.
Failure to follow these warnings can result in serious injury including but not limited to permanent hearing loss.
Dispose of the product in accordance with national legislation
The product is warranted to be free of manufacturing defects for two years from the date of manufacture.
ATTENUATION DATA (Table 1)
The sound attenuation values for the ear-muffs are measured in accordance with EN 24869-1. For further information, refer
to Table 1.
Key:
f = Frequencies at which attenuation is measured, Mf = Mean value, sf = Standard deviation, APV (Mf–sf) = Assumed
Protection Value
H = High frequency attenuation value (predicted noise level reduction for noise where L
M = Medium frequency attenuation value (predicted noise level reduction for noise where L
L = Low frequency attenuation value (predicted noise level reduction for noise where L
SNR = Single Number Rating (the value that is subtracted from the measured C-weighted sound pressure level, L
to estimate the effective A-weighted sound level inside the ear)
W = Weight
EAR-MUFF SIZES AND HELMET COMBINATIONS (Table 2)
For further information, refer to Table 2. The table shows to which size range each helmet/ear-muff combination is
classified. It also shows which ear-muff adapter to use for each helmet.
Key:
Manufacturer/model = Helmet brand; Adapter Type No = A number found on the backside of the ear-muff adapter, see pic.
H; Size range = Approved size range (S=small; M=medium; L=large);
HYGIENE KITS (Table 3)
Key:
Description = Hygiene kit; Product Number = Item part number
HELMET ADAPTER KITS (Table 4)
Key:
Description = Helmet adapter kit; Product Number = Item part number
PRODUCT MODELS (Table 5)
Key:
Description = MSA ear-muffs model; Product Number = Item part number
–L
= –2 dB)
C
A
–L
= +2 dB)
C
A
–L
= +10 dB)
C
A
, in order
C
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