Where should cleanout locations be legibly identified?

Cleanout locations should be legibly identified at the point of access from the interior space to ensure that maintenance personnel can easily locate them for cleaning and inspection purposes. This identification helps facilitate efficient access and reduces the likelihood of errors during maintenance, as workers can quickly find where to access the ducts for necessary cleaning without needing to search for the cleanouts or guess their locations.

Identifying cleanouts from the exterior or at the duct entrance may not provide adequate visibility or accessibility for maintenance personnel working inside the building. Furthermore, marking them at the duct's end may not directly assist those needing immediate interior access. By focusing identification at the point of access, the system remains compliant with maintenance codes and ensures good practices are upheld in HVAC system management. This alignment with best practices underscores the importance of maintaining clear, functional identification for cleanout locations in duct systems.