For Feature 03 Ventilation Effectiveness, which documentation is required?

• A. LOA from architect and contractor
• B. Commissioning Report
• C. Building permit
• D. LOA from MEC engineer & Commissioning Report

Answer: (D)

Ventilation effectiveness is proven through both design accountability and performance verification. For this WELL feature, you need documentation from the qualified professional responsible for the mechanical, electrical, and controls systems and a record of on-site testing that confirms the system actually operates as intended. An LOA from the MEC engineer provides formal confirmation that the ventilation system has been designed and installed to meet the WELL criteria, with the engineer standing behind the performance claims. The Commissioning Report documents the field testing, measurements, and adjustments made during commissioning, showing that airflow rates, air distribution, and control sequences meet the targeted performance.

A letter from the architect and contractor lacks the necessary engineering authority and does not attest to system performance. A building permit covers code compliance but not WELL-specific ventilation performance. A Commissioning Report alone does not provide the required professional assurance without the accompanying LOA. Hence, the required documentation is the LOA from the MEC engineer and the Commissioning Report.