Which of the following is NOT a credited testing laboratory for firestop products?

The National Fire Prevention Association (NFPA) is primarily recognized for developing codes and standards related to fire safety, rather than being a testing laboratory that evaluates firestop products. Unlike accredited testing laboratories, which conduct extensive evaluations to ensure that products meet specific safety and performance standards, the NFPA focuses on creating guidelines and recommendations for fire safety practices.

In contrast, Underwriters Laboratories Inc. (UL), Internet Testing Services, and Omega Point Laboratories are established testing facilities that are credited to carry out such evaluations. These organizations validate the performance characteristics of firestop systems and products, ensuring they comply with safety regulations and standards. Thus, the NFPA does not fit the criteria of an accredited testing laboratory for firestop products, which makes it the correct choice for the question posed.