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The Lincoln Mark VIII electric fan is an 18-inch monster that also pulls some serious amperage. This fan measures 22 (W) x 18.9 (H) x 4.5 inches deep. A serious car crafter claimed on the Internet to have tested this fan at 2,700 cfm. Be aware that some Mark VIII fans are single speed. The integrated shroud pulls air across the entire radiator core surface, which is the main reason these fans are so efficient.