LEED AP Building Design and Construction (BD+C) Practice Exam

What MERV rating is required for the filtration of supply air prior to occupancy in mechanically ventilated buildings?

1. MERV 11

2. MERV 13

3. MERV 15

4. MERV 9

The correct answer is: MERV 13

The requirement for a MERV 13 rating for the filtration of supply air prior to occupancy in mechanically ventilated buildings is grounded in the goal of enhancing indoor air quality and ensuring the protection of building occupants. MERV, or Minimum Efficiency Reporting Value, is a system used to rate the effectiveness of air filters at capturing particles of varying sizes. Using MERV 13 filters provides a higher level of air filtration than lower-rated filters. These filters are capable of capturing a significant percentage of airborne particles, including some common allergens and pollutants. This is crucial in mechanically ventilated buildings, where controlled ventilation is necessary for managing indoor air quality, especially prior to occupancy when dust, debris, and other particles can accumulate in the space. The selection of MERV 13 filters aligns with best practices that focus on health and comfort by significantly reducing the transmission of harmful contaminants. This level of filtration is also often considered a standard within various green building certification systems, including LEED, to promote healthier environments in commercial and residential buildings. Thus, using MERV 13 filters contributes to a reduction in potential health impacts associated with poor indoor air quality during the initial occupancy phase.