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LEED v2009
Existing Building Operations
Indoor Environmental Quality
IAQ Best Management Practices—Increased Ventilation

LEED CREDIT

EBOM-2009 IEQc1.3: Indoor air quality best management practices - increased ventilation 1 point

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Roger Chang

DLR Group | Westlake Reed Leskosky
Principal, Energy and Engineering Leader

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Credit language

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© Copyright U.S. Green Building Council, Inc. All rights reserved.

Requirements

Case 1. Mechanically vented spaces
Option 1. ASHRAE standard 62.1-2007 or non-U.S. equivalent
Increase outdoor air ventilation rates for all air-handling units serving occupied spaces by at least 30% above the minimum required by ASHRAE Standard 62.1-2007 (with errata but without addenda) as determined by IEQ Prerequisite 1: Minimum Indoor Air Quality Performance. Projects outside the U.S. may use a local equivalent to ASHRAE Standard 62.1-2007 if used in IEQ Prerequisite 1: Minimum Indoor Air Quality Performance. OR
Option 2. CEN standard EN 15251: 2007
Projects outside the U.S. may increase breathing zone outdoor air ventilation rates to all occupied spaces by at least 30% above the minimum rates required by Annex B of Comité Européen de Normalisation (CEN) Standard EN 15251: 2007, Indoor environmental input parameters for design and assessment of energy performance of buildings, addressing indoor air quality, thermal environment, lighting and acoustics, determined by IEQ Prerequisite 1, Minimum Indoor Air Quality Performance.
Case 2. Naturally ventilated spaces
Determine whether natural ventilation is an effective strategy for the project by following the flow diagram process in Figure 2.8 of the Chartered Institution of Building Services Engineers (CIBSE) Applications Manual 10: 2005, Natural Ventilation in Non-domestic Buildings. [Latin America ACP: Engineered Natural Ventilation Systems]

AND

Option 1. CIBSE or non-U.S. equivalent
Show that the natural ventilation systems design meets the recommendations set forth in the CIBSE manuals appropriate to the project space.
Path 1
Use CIBSE Applications Manual 10: 2005, Natural Ventilation in Non-domestic Buildings. Projects outside the U.S. may use a local equivalent.
Path 2
Use CIBSE AM 13:2000, Mixed Mode Ventilation. Projects outside the U.S. may use a local equivalent.

OR

Option 2. Airflow Model
Use a macroscopic, multizone, analytic model to predict that room-by-room airflows will effectively naturally ventilate, defined as providing the minimum ventilation rates required by ASHRAE Standard 62.1-2007 section 6 (with errata but without addenda), at least 90% of occupied spaces. Projects outside the U.S. may use Annex B of Comité Européen de Normalisation (CEN) Standard EN 15251: 2007, or a local equivalent to section 6 of ASHRAE Standard 62.1-2007 to define the minimum ventilation rates. See all forum discussions about this credit »

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Addenda

7/6/2012Updated: 2/14/2015
Global ACP
Description of change:
Case 2, Option 2 should read: "OPTION 2. Airflow Model"
Campus Applicable
No
Internationally Applicable:
Yes
12/2/2009Updated: 2/14/2015
Reference Guide Correction
Description of change:
Remove the entire section labeled "The Carbon Trust Good Practice Guide 237"
Campus Applicable
No
Internationally Applicable:
No
7/6/2012Updated: 2/14/2015
Global ACP
Description of change:
Add the following sentence to the end of Path 1. "Projects outside the U.S. may use a local equivalent."
Campus Applicable
No
Internationally Applicable:
Yes
12/2/2009Updated: 2/14/2015
Rating System Correction
Description of change:
In the first paragraph, remove the text "Design natural ventilation systems for occupied spaces to meet the recommendations set forth in the Carbon Trust "Good Practice Guide 237" (1998)."
Campus Applicable
No
Internationally Applicable:
No
7/6/2012Updated: 2/14/2015
Global ACP
Description of change:
Delete the Alternative Compliance Path for Projects Outside the U.S.
Campus Applicable
No
Internationally Applicable:
Yes
7/6/2012Updated: 2/14/2015
Global ACP
Description of change:
Add an Option title before the first paragraph that reads: "OPTION 1. ASHRAE Standard 62.1-2007 or Non-U.S. Equivalent"
Campus Applicable
No
Internationally Applicable:
Yes
7/6/2012Updated: 2/14/2015
Global ACP
Description of change:
Add an Option title after the first paragraph that reads: "OPTION 2. CEN Standard EN 15251: 2007"
Campus Applicable
No
Internationally Applicable:
Yes
7/6/2012Updated: 2/14/2015
Global ACP
Description of change:
In the first sentence, replace "Chapter" with "section" after "ASHRAE Standard 62.1-2007"
Campus Applicable
No
Internationally Applicable:
Yes
12/2/2009Updated: 2/14/2015
Reference Guide Correction
Description of change:
In the first paragraph, remove the text "Design natural ventilation systems for occupied spaces to meet the recommendations set forth in the Carbon Trust "Good Practice Guide 237" (1998)."
Campus Applicable
No
Internationally Applicable:
No
7/6/2012Updated: 2/14/2015
Global ACP
Description of change:
Add the following sentence to the end of Path 2. "Projects outside the U.S. may use a local equivalent."
Campus Applicable
No
Internationally Applicable:
Yes
12/2/2009Updated: 2/14/2015
Reference Guide Correction
Description of change:
Remove the text in the paragraph and insert: Show that the natural ventilation systems design meets therecommendations set forth in the CIBSE manuals appropriate to theproject space.PATH 1. CIBSE Applications Manual 10: 2005, Natural Ventilation inNon-domestic Buildings.PATH 2. CIBSE AM 13:2000, Mixed Mode Ventilation.
Campus Applicable
No
Internationally Applicable:
No
7/6/2012Updated: 2/14/2015
Global ACP
Description of change:
Case 2, Option 1 should read: "OPTION 1. CIBSE or Non-U.S. Equivalent"
Campus Applicable
No
Internationally Applicable:
Yes
12/2/2009Updated: 2/14/2015
Rating System Correction
Description of change:
Remove the text in the paragraph and insert: Show that the natural ventilation systems design meets therecommendations set forth in the CIBSE manuals appropriate to theproject space.PATH 1. CIBSE Applications Manual 10: 2005, Natural Ventilation inNon-domestic Buildings.PATH 2. CIBSE AM 13:2000, Mixed Mode Ventilation.
Campus Applicable
No
Internationally Applicable:
No
7/6/2012Updated: 2/14/2015
Global ACP
Description of change:
Add the following to the end of the first sentence: "as determined by IEQ Prerequisite 1: Minimum Indoor Air Quality Performance."
Campus Applicable
No
Internationally Applicable:
Yes
7/6/2012Updated: 2/14/2015
Global ACP
Description of change:
Option 2 should read: "Projects outside the U.S. may increase breathing zone outdoor air ventilation rates to all occupied spaces by at least 30% above the minimum rates required by Annex B of Comit
Campus Applicable
No
Internationally Applicable:
Yes
7/6/2012Updated: 2/14/2015
Global ACP
Description of change:
Add the following sentence to the end of the paragraph. "Projects outside the U.S. may use Annex B of Comit
Campus Applicable
No
Internationally Applicable:
Yes
7/6/2012Updated: 2/14/2015
Global ACP
Description of change:
After the first sentence, add the following: "Projects outside the U.S. may use a local equivalent to ASHRAE Standard 62.1-2007 if used in IEQ Prerequisite 1: Minimum Indoor Air Quality Performance. Projects pursuing a local equivalent must apply the Ventilation Rate Procedure, as defined by ASHRAE 62.1-2007, to the ventilation values taken from the local equivalent to ASHRAE 62.1-2007."
Campus Applicable
No
Internationally Applicable:
Yes
See all forum discussions about this credit »

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Credit achievement rate

XX%

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LEEDuser expert

Roger Chang

DLR Group | Westlake Reed Leskosky
Principal, Energy and Engineering Leader

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USGBC logo

© Copyright U.S. Green Building Council, Inc. All rights reserved.

Requirements

Case 1. Mechanically vented spaces
Option 1. ASHRAE standard 62.1-2007 or non-U.S. equivalent
Increase outdoor air ventilation rates for all air-handling units serving occupied spaces by at least 30% above the minimum required by ASHRAE Standard 62.1-2007 (with errata but without addenda) as determined by IEQ Prerequisite 1: Minimum Indoor Air Quality Performance. Projects outside the U.S. may use a local equivalent to ASHRAE Standard 62.1-2007 if used in IEQ Prerequisite 1: Minimum Indoor Air Quality Performance. OR
Option 2. CEN standard EN 15251: 2007
Projects outside the U.S. may increase breathing zone outdoor air ventilation rates to all occupied spaces by at least 30% above the minimum rates required by Annex B of Comité Européen de Normalisation (CEN) Standard EN 15251: 2007, Indoor environmental input parameters for design and assessment of energy performance of buildings, addressing indoor air quality, thermal environment, lighting and acoustics, determined by IEQ Prerequisite 1, Minimum Indoor Air Quality Performance.
Case 2. Naturally ventilated spaces
Determine whether natural ventilation is an effective strategy for the project by following the flow diagram process in Figure 2.8 of the Chartered Institution of Building Services Engineers (CIBSE) Applications Manual 10: 2005, Natural Ventilation in Non-domestic Buildings. [Latin America ACP: Engineered Natural Ventilation Systems]

AND

Option 1. CIBSE or non-U.S. equivalent
Show that the natural ventilation systems design meets the recommendations set forth in the CIBSE manuals appropriate to the project space.
Path 1
Use CIBSE Applications Manual 10: 2005, Natural Ventilation in Non-domestic Buildings. Projects outside the U.S. may use a local equivalent.
Path 2
Use CIBSE AM 13:2000, Mixed Mode Ventilation. Projects outside the U.S. may use a local equivalent.

OR

Option 2. Airflow Model
Use a macroscopic, multizone, analytic model to predict that room-by-room airflows will effectively naturally ventilate, defined as providing the minimum ventilation rates required by ASHRAE Standard 62.1-2007 section 6 (with errata but without addenda), at least 90% of occupied spaces. Projects outside the U.S. may use Annex B of Comité Européen de Normalisation (CEN) Standard EN 15251: 2007, or a local equivalent to section 6 of ASHRAE Standard 62.1-2007 to define the minimum ventilation rates.

XX%

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  • Sample templates to help guide your narratives and LEED Online submissions.
  • Examples of actual submissions from certified LEED projects.

LEEDuser expert

Roger Chang

DLR Group | Westlake Reed Leskosky
Principal, Energy and Engineering Leader

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