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Originally Posted by Bubblehead Nuke
I never understood the need to ventilate to do an air charge. The compressors are in the pressure hull and it is a closed system. You have to do them periodically due to the numerous air leaks thougthout the boat.
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Actually, you can do a charge, but only for about 10% of the volume. I guess they didn't want you to be able to blow to 30% and then fully recharge your bank submerged when the pressure isn't there anymore.