Accurate and complete documentation helps protect the integrity of a HERS® Rating and supports efficient quality assurance reviews. Mechanical ventilation systems are one area where complete photo records are particularly important because they document both system identification and performance verification. What Documentation Is Required? HERS® Standards 904.3.2.7.3.1 require Rating Providers to collect, review, and maintain supporting documentation, including photos, for each file QA review. For dwelling unit mechanical ventilation systems, documentation shall include photos of: The nameplate with model number. System controls, as applicable. Mechanical ventilation test results for each system. These records help demonstrate that the installed system was identified correctly, and that required airflow testing was performed. Best Practices for Field Documentation System Identification ✓ Overall view of the ventilation unit. ✓ Clear photo of the nameplate with model number (required). ✓ Photo of system controls or controller settings, as applicable (required). Performance Verification ✓ Photo showing measured airflow or other required test results (required). ✓ Photo taken at the time testing is performed. Documentation Tips Review photos before leaving the site. Ensure labels and displays are legible. Include enough context to identify the equipment location. Maintain records in accordance with RESNET requirements. Why It Matters Complete documentation supports: Consistent quality assurance reviews. Confidence in the accuracy of HERS® Ratings. Traceability of installed equipment and measured performance. Efficient resolution of questions that may arise after the rating is completed. Developing a consistent photo protocol for mechanical ventilation systems can help Rating Companies and Raters avoid unnecessary follow-up requests and maintain complete, defensible rating files. Reference: HERS® Standards Section 904.3.2.7.3.1. If you have any questions about mechanical ventilation documentation, please contact your RESNET QA team at technicalsupport@resnet.us.
