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O
PERATION
Chemical/Biological Filter Use
The unit is designed to allow attachment of chemical/biological filter/canister (type C2A1
use in contaminated environments. The Fresh Gas/Emergency Air Intake fitting allows for
attachment of standard Rd 40 x 1/7 threads. A complete description of this standard can be
found in BS EN 148-1:1999 Respiratory protective devices - Threads for face pieces.
Check Valve on Breathing Circuit when in Hazardous Environments
When operating in a Hazardous Situation where a chemical/biological filter is in use, the
operator should use a Check Valve (Part #704-0700-01) to prevent hazardous gas from entering
the patient's breathing circuit. The exhalation valve on the breathing circuit is not adequate to
protect patients if they rapidly inhale/exhale as the valve may not fully close in time to prevent
hazardous gas entrainment. Also, if the PEEP is set low, patients may inhale faster than the flow
is delivered which could cause hazardous gas entrainment. Consequently, a Check Valve is
required to protect patients.
Warning!
The unit is shipped with both the pediatric/adult and infant/pediatric single limb
circuits. A Check Valve (704-0700-01) is required with these breathing circuits when
operating in a hazardous environment. The correct mating of the Check Valve with the
breathing circuit is shown below. Operators who anticipate use in these environments
should also stock the Check Valve.
5. A 3M C2A1 canister (3M St. Paul, MN) was used in our validation testing to represent the class of filters
generically known as C2A1 under the NSN number 4240-01-361-1319. These tests confirmed the
performance of the ventilator when operating with these devices as a class. Use of the 3M canister does not
constitute endorsement or recommendation of the 3M device. Use and selection of the appropriate filter
should always be under the direction of the Incident Commander.
3-12
Check Valve Connection To Breathing Circuit
www.zoll.com
5
) for
906-0731-01 Rev. J
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