Rating System

LEED BD+C: New Construction

Rating System Version

v2 - LEED 2.0

Inquiry

In most residential buildings outside air is supplied through operable windows, and indirectly, through infiltration. Mechanical ventilation for outside air is typically not required by code (and is specifically not required in New York City). The ventilation effectiveness criteria cited in this credit are meant for more sophisticated commercial facilities, where mechanical ventilation is mandatory. The developer is implementing the following measures for this project, and proposes that these be considered adequate to meet the intent of this credit: 1) All apartments are provided a positive mechanical supply of outside air. The supply ventilation will meet, or surpass, the criteria of ASHRAE 62-1999. While this method does not ensure an air change effectiveness of 0.9, it does mandate mechanical ventilation where none would otherwise be provided. IAQ is improved through dilution. 2) Operable windows are provided in all living rooms and bedrooms. 3) 100% outside air is provided for all public corridors. With these criteria, we feel that the intent of this credit is met for the high-rise residential building context.