Durable, Thermal Flexible Door Panels Raynor FlexRe-Fit commercial thermal flexible door panels can be used virtually anywhere. With no pre-determined hinge or hardware restrictions and available in custom-cut lengths, the FlexRe-Fit door panels are a versatile solution. FlexRe-Fit thermal flexible door panels are designed to flex upon impact, rather than dent and bend like conventional metal sections to help maximize in-service time and increase first call resolution.