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Consult the factory for larger sizes. FREEZE-SAFE heated mats are designed for use in classified locations. (Class 1, Div. II, Group A, B, C, D). Class 1, Div. II are locations where explosive vapor conditions could exist in the event of abnormal operation, an accident, or component failure. Flammable gases and liquid groups (such as acetylene, hydrogen, ethylene, gasoline and propane) are included in this classification. Refer to articles 500 through 505 of the National Electric Code for more