Why are non-metallic or foil ducts generally prohibited in dryer exhaust installations?

Why are non-metallic or foil ducts generally prohibited in dryer exhaust installations?

• A. They conduct heat better than metal ducts.
• B. They are not rated for high heat, more prone to cracking and lint buildup, and fire hazards.
• C. They are cheaper than metal ducts but equally safe.
• D. They require no maintenance.

Answer: (B)