This order establishes the legal framework for identifying specific fireplace models that are exempt from the smoke control restrictions mandated by the Clean Air Act. The document originates from the British government's legislative efforts to mitigate urban air pollution during the mid-twentieth century. It provides the regulatory criteria necessary for local authorities to permit the installation of appliances that do not produce excessive smoke emissions. This framework serves as a foundational administrative tool for balancing residential heating needs with public health standards.

Legal professionals and environmental historians utilize this text as a primary source for understanding the evolution of British air quality legislation. Experts note that the document is highly technical and serves primarily as a reference for regulatory compliance within the context of 1970s environmental policy.