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Type B Vent pipe is constructed with an inner pipe and outer pipe. The inner pipe is made of:

  1. Aluminum

  2. Copper

  3. Galvanized steel

  4. Stainless steel

The correct answer is: Aluminum

The correct answer is A, aluminum. B, copper, is incorrect because copper is not typically used for vent pipes. Copper is more commonly used for plumbing pipes. C, galvanized steel, is incorrect because while it is a common material for vent pipes, it is used for the outer pipe rather than the inner pipe. D, stainless steel, is incorrect because it is not used for vent pipes due to its high cost and difficulty in working with.