CFR

Title 1 - General Provisions
Title 2 - Grants and Agreements
Title 3 - The President
Title 4 - Accounts
Title 5 - Administrative Personnel
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Title 14 - Aeronautics and Space
Title 15 - Commerce and Foreign Trade
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Title 18 - Conservation of Power and Water Resources
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Title 38 - Pensions, Bonuses, and Veterans' Relief
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Title 48 - Federal Acquisition Regulations System
Title 49 - Transportation
Title 50 - Wildlife and Fisheries

159.61—Vents.

Vents must be designed and constructed to minimize clogging by either the contents of the tank or climatic conditions such as snow or ice.

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