In ventilation rate procedures (VRP), which items are identified as factors that typically influence outdoor air rates?

• A. Climate only
• B. Occupant load, space area, and design parameters per space type
• C. Building age
• D. Equipment efficiency and energy cost

Answer: (B)

The key idea is that outdoor air rates in VRP are set by how many people use the space, how big the space is, and the design values assigned to that space type. In VRP, the outdoor air rate for a space is typically calculated using the space’s occupant load and floor area together with design parameters that specify how much outdoor air is needed per person and per unit area. So the total outdoor air rate depends on P (occupant load), A (space area), and the design parameters for that space type (the per-person and per-area rates). Climate, building age, or energy-cost considerations don’t directly set the VRP outdoor air rates.