Third-party certification is a process of testing and verifying a fire door’s design, performance, manufacturing process and quality assurance of procedures and supporting documentation. A company that seeks third-party certification is independently audited to ensure that the management and manufacturing processes, and supporting systems, are in place to ensure consistency with the fire door / fire doorset that was initially tested. The product is also subjected to regular scrutiny, with periodic testing taking place on standard products to ensure that the test wasn’t just a once-only event.