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04. Technical details
The 4240 face mask system is a class 2A device and will provide protection against airborne
dusts, mists, gases and vapours up to a Nominal Protection Factor (NPF) of 50, i.e. it can be
used in areas where the concentration of contaminant in the workplace air is up to 50 times the
Occupational Exposure Limit (OEL).
• This system should not be used where the level of contaminant exceeds 50 x the OEL or where
the contaminant or its level is unknown.
• This system should not be used in oxygen deficient atmospheres.
• This system should not be used below 0°C.
Air Supply Specification
• Input pressure: 3.3 bar (47 PSI) at input to supply hose.
• System consumption: 150 litres/minute (5.3 cfm) minimum.
The air supply must be of breathable quality as defined in EN 12021.
The air supply system should be equipped with a pressure relief
safety valve.
Air hose Specification
The system should be used with a single 5/16" (8 mm.) supply hose with maximum working
pressure of 15 bar (217.5 PSI) and maximum length of 10 m.
The air supply hose is only suitable for use in areas where risk of
damage is low and movements of the wearer are limited. It has no
additional antistatic or heat resistant properties.
• Air Flow Indicator Minimum Design Flowrate: 150 litres/min (5.3 cfm).
• A whistle is positioned on the regulator attached to the adjustable belt. The whistle is desgined
to make a sound when the air drops below the minimum design flow rate.
Regulator specification
This regulator has limited adjustment. Do not attempt to over-adjust it.
• This adjustment allows the user to maintain sufficient air flow to the visor when using auxiliary
attachments and to adjust for comfort. The regulator has an individual serial number. The last two
numbers denote the year of manufacture.
Dimensions
Weight
(with filter)
Nominal protection factor
Air pressure recommended
Maximum length of supply
hose to the regulator
Pressure range
to the face mask
Temperature of the work
environment
Working life of the filter
Impact protection of the visor
4240 Face Mask Technical details
17.5 x 14 x 4.5 cm
483 g
3,3 bar
10 m
(maximum) 232 L/min / 8.1 cfm
(minimum) 150 L/min / 5.3 cfm
o
0 - 50
C
400 hours (Approx. 2 months)
EN 166 F
ENGLISH
6.9 x 5.5 x 1.8 "
1.06 lbs
50
47 psi
394 "
o
32 - 122
F