A multi-center study to evaluate the efficacy of CHADD (Controlled Heat-Assisted Drug Delivery) applied over a 50 mcg/hr ZR-02-01 matrix transdermal fentanyl patch for the treatment of breakthrough pain in adult patients with moderate to severe non-malignant chronic pain. The open-label study arm will last up to 12 days. The double-blind arm will last up to 15 days. Eligible patients who complete the open-label arm will be allowed to enroll in the double-blind study arm.