Posted By Ian Stone Hi all We train people to work on Royal Navy ships in local dockyard. As part of the couse we have a very large engine so they can service and maintain it. To start this engine they are planning on using two lorry batteries. They will only be use twice a year but a question has been raised about fumes given off by the batteries when on charge. The engine has LEV conected to the exhaust but the batteries are kept in an ajoining room. Is natural ventalation enough or do we need to fit LEV? many thanks Ian