yes. it's to prevent build up of hydrogen gas. the battery box should be airtight and a hose should be run from the box to the exterior of the car. very easy to do this. seal the lid with any appropriate lining and do the same for any holes running in and out of the box (cable holes, venting tube hole) with an appropriate grommet.
some people say you don't need venting if you run an optima because they never outgas. this is technically incorrect, but it's not as necessary as with a regular battery.
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When used with a properly regulated constant voltage charging system (such as an alternator) the OPTIMA will usually not emit hydrogen gas. However, gassing can occur when charging at higher voltage levels or in extreme high temperature conditions. In automotive applications this typically will not happen if the alternator/regulator stay below 15 volts.
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