SMACNA has included a procedure for leakage testing of ductwork since January of 1965. The process like many others has evolved after more research and feedback from the industry led to changes in both the pass/fail criteria and the application of testing. The next major leap in the process is this standard. It goes beyond the duct and includes procedures for any item included in a forced air system. As the focus on energy use intensifies so does the focus on leakage. The problem is that many of the claims made are based on models, not real measurements and upon further inspection the models are based on flawed assumptions. This results in buildings not meeting performance expectations because the expectations were flawed to begin with.
This standard addresses leakage testing of the entire forced air system and does so in a practical manner where the pass/fail criterions are based on sound research. The emphasis is on the entire process and team, not just the installing contractor. Systems need to be designed to achieve the desired performance. Designing is more than simply writing ones wishes in the specifications. Manufacturers need to provide useful data free from marketing gimmicks so the advertised performance is relevant to field performance and testing.
This standard is the next step in the evolution of forced air system performance and when applied will improve the performance of a forced air system while balancing the costs of doing so. SMACNA expresses appreciation to all of those whose knowledge and effort led to the development of this new standard.