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NOT MORE THAN 10 gallons of combined Class I plus Class II liquids should be outside of approved flammable storage containers.

This means that 10 gallons can be out and everything else must be in a flammable storage cabinet or properly functioning safety cans. (See examples of Common Class I and Class II liquids.)

A flammable storage cabinet may be minimally vented (must be approved by Safety and Security), and only via the provided bung(s). Cutting into it instantly un-approves it.