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LEED Guidance

 

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  LEED Guidance
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EQ Credit 2
EQ Credit 2: Increased Ventilation
1 Point

Intent
Provide additional outdoor air ventilation to improve indoor air quality for improved occupant comfort, wellbeing
and productivity.

Requirements
FOR MECHANICALLY VENTILATED SPACES
  • Increase breathing zone outdoor air ventilation rates to all occupied spaces by at least 30% above the minimum rates required by ASHRAE Standard 62.1-2004 as determined by EQ Prerequisite 1.
FOR NATURALLY VENTILATED SPACES
Design natural ventilation systems for occupied spaces to meet the recommendations set forth in the Carbon Trust
“Good Practice Guide 237” [1998]. Determine that natural ventilation is an effective strategy for the project
by following the flow diagram process shown in Figure 1.18 of the Chartered Institution of Building Services
Engineers (CIBSE) Applications Manual 10: 2005, Natural ventilation in non-domestic buildings.

AND
  • Use diagrams and calculations to show that the design of the natural ventilation systems meets the recommendations set forth in the CIBSE Applications Manual 10: 2005, Natural ventilation in non-domestic buildings.
OR
  • Use a macroscopic, multi-zone, analytic model to predict that room-by-room airflows will effectively naturally ventilate, defined as providing the minimum ventilation rates required by ASHRAE 62.1-2004 Chapter 6, for at least 90% of occupied spaces.
Potential Technologies & Strategies
For Mechanically ventilated Spaces: Use heat recovery, where appropriate, to minimize the additional energy consumption associated with higher ventilation rates. For Naturally ventilated Spaces: Follow the eight design steps described in the Carbon Trust Good Practice Guide 237 – 1) Develop design requirements, 2) Plan airflow paths, 3) Identify building uses and features that might require special attention, 4) Determine ventilation requirements, 5) Estimate external driving pressures, 6) Select types of ventilation devices, 7) Size ventilation devices, 8) Analyze the design. Use public domain software such as NIST’s CONTAM, Multizone Modeling Software, along with LoopDA, Natural Ventilation Sizing Tool, to analytically predict room-by-room airflows.