Project teams using this option need to show that ventilation rates are 30% better than the ASHRAE standard. The LEED Reference Guide does not make this clear, but it is a requirement for compliance.

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Project teams using this option need to show that ventilation rates are 30% better than the ASHRAE standard. The LEED Reference Guide does not make this clear, but it is a requirement for compliance.

Your model must indicate the room-by-room airflow rates predicted by the analysis and demonstrate that 90% of the occupied building areas are effectively ventilated by natural means to provide the minimum ventilation rates required by ASHRAE 62.1-2007.

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Your model must indicate the room-by-room airflow rates predicted by the analysis and demonstrate that 90% of the occupied building areas are effectively ventilated by natural means to provide the minimum ventilation rates required by ASHRAE 62.1-2007.

You may also provide the same information required for Option 1 in the format of a macroscopic, multi-zone, analytic model that predicts room-by-room airflow rates.

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You may also provide the same information required for Option 1 in the format of a macroscopic, multi-zone, analytic model that predicts room-by-room airflow rates.

Additional costs may be incurred if you need to hire a qualified engineer to perform this assessment. Unless this assessment was performed and documented during the design phase, it’s unlikely that the costs to retroactively perform the assessment are wor

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Additional costs may be incurred if you need to hire a qualified engineer to perform this assessment. Unless this assessment was performed and documented during the design phase, it’s unlikely that the costs to retroactively perform the assessment are worth pursuit of this credit.

Calculations should note the size of operable windows, trickle vents and louvers, and indicate the effects of both wind and stack-induced pressure differentials on the building’s ventilation and airflow.

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Calculations should note the size of operable windows, trickle vents and louvers, and indicate the effects of both wind and stack-induced pressure differentials on the building’s ventilation and airflow.

Your analysis must address major building factors, including building orientation, to determine exposure to sun and wind; the amount of glazing; internal heat gains; and local weather conditions.

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Your analysis must address major building factors, including building orientation, to determine exposure to sun and wind; the amount of glazing; internal heat gains; and local weather conditions.

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