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LEED v4.1

Existing Buildings

Indoor Environmental Quality
Minimum Indoor Air Quality

LEED CREDIT

EBOM-v4.1 EQp1: Minimum Indoor Air Quality Required

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Requirements

Maintain the ventilation system equipment and associated components based on Table 8.2 of ASHRAE 62.1-2016. Include information on ventilation system operation and preventative maintenance in the current facilities requirements and operations and maintenance plan required for compliance with EA prerequisite Energy Efficiency Best Management Practices.

For spaces with mechanical exhaust, test and confirm proper operation of the exhaust systems as outlined in the current facilities requirements and operations and maintenance plan.

Ventilate the project spaces mechanically or naturally as follows:

For mechanically ventilated spaces, measure the total quantity of outdoor air delivered and verify the results are within 10 percent of the rates outlined in the current facilities requirements and operations and maintenance plan. Measurements shall quantify the amount of outdoor air for each air handling unit serving the project. Measurements taken within five years prior to project submission are acceptable. The rates must meet the following minimum requirements for each air handling unit:

In I-P units:
Minimum outdoor air rate in cfm = 0.06 cfm/sf x gross building area (in sf) + people outdoor air rate from Table 1 (cfm/person) x building occupancy

In SI units:
Minimum outdoor air rate in L/s = 0.3 L/s*m2 x gross building area (in m2) + people outdoor air rate from Table 1 (L/s per person) x building occupancy

Table 1. People outdoor air rate
Occupancy category* People outhoor air rate
cfm per person L/s per person
Auditorium seating area Libraries Office space Places of religious worship 5 2.5
Mall common areas Museums 7.5 3.8
Classrooms Daycare General manufacturing 10 5
Health club/aerobics 20 10

*For additional occupancy categories, see Table 6.2.2.1 of ASHRAE 62.1-2016

Alternatively, the rates may meet the Ventilation Rate Procedure outlined in Section 6.2 of ASHRAE 62.1 editions 2016, 2013, 2010, or 2007.

For naturally ventilated spaces, meet the minimum requirements in Table 2:
Table 2. Minimum opening location and size requirements for naturally ventilated spaces*
Opening type Location of opening Size of opening
Maximum distance from operable openings** Minimum opening area***
Single side opening 2 x ceiling height 4% of floor area
Double side opening 5 x ceiling height 4% of floor area
Corner opening 5 x ceiling height (along a line drawn between the two openings that are farthest apart.; for floor area outside line, comply with single side opening)  4% of floor area

*Adopted from Section 6.4.1 of ASHRAE 62.1-2016
**For ceilings that are increasing in height as distance from the openings is increased, the ceiling height shall be determined as the average height of the ceiling within 6 m (20 ft) from the operable openings.
***If the window is covered with louvers, insect screens, or otherwise obstructed, the openable area must be based on the free unobstructed area through the opening.

Multifamily

For all common areas in the building, meet requirements above.

For residential units, have an operable window in each bedroom with the total openable window area a minimum of 4% of the room floor area or meet the following minimum requirements for the entire unit:

In I-P units:
Minimum outdoor air rate in cfm = 0.03 cfm/sf x dwelling unit floor area (in sf) + 7.5 cfm/person x (number of bedrooms + 1)

In SI units:
Minimum outdoor air rate in L/s = 0.15 L/s*m2 x dwelling unit floor area (in m2) + 7.5 cfm/person x (number of bedrooms + 1)

In each full bathroom, have either an exhaust fan that vents directly to the outdoors or an operable window.

Europe ACP: Arbeitsstaettenrichtlinie ASR 5
Projects in Europe may use Arbeitsstaettenrichtlinie ASR 5 or ASR A3.6 as a local equivalent to ASHRAE Standard 62.1-2010, natural ventilation procedure.
India ACP: Mechanically Ventilated
Projects in India may meet the following as a local equivalent to ASHRAE 62.1-2010:
  • For single-zone and 100% outside air systems, National Building Code of India 2005 (NBC 2005) Table 4-air rate requirements in lieu of ASHRAE 62.1-2010 ventilation rate procedure. Only certain space types are eligible.
  • Central Pollution Control Board (CPCB), National Ambient Air Quality Standards in lieu of ASHRAE 62.1-2010, Section 4.
  • NBC 2005 Part 8, section 3, clause 3.2, with additional parameters, in lieu of ASHRAE 62.1-2010, Minimum Requirements, Sections 5-7.
India ACP: Naturally Ventilated NBC
Projects in India may use NBC 2005 Part 8, Section 1, clauses 5.2.1-5.6 and Appendix A: Design for Natural Ventilation from Handbook on Functional Requirements of Buildings (other than Industrial Buildings), also known as SP 41, 1987 as a local equivalent to ASHRAE Standard 62.1-2010, natural ventilation procedure.
India ACP: Naturally Ventilated CPCB
Projects in India may compare outdoor air quality with the CPCB National Ambient Air Quality Standards in lieu of the U.S. national air quality standards as required in ASHRAE Standard 62.1-2010, Section 4. See all forum discussions about this credit »

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Frequently asked questions

How do I find whether my project is located in a non-attainment area for particulate matter or exceeds the prerequisite ozone requirements?

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The outdoor air intake for our ventilation system is not accessible, and it’s not possible to measure the outdoor airflow directly. How can we determine the outdoor airflow for this system?

The answer to this question is available to LEEDuser premium members. Start a free trial »

(If you're already a premium member, log in here.)

What if our systems do not meet the required outside air when systems are tested at worst-case conditions?

The answer to this question is available to LEEDuser premium members. Start a free trial »

(If you're already a premium member, log in here.)

Our system cannot provide enough outdoor air due to design limitations. What should we do?

The answer to this question is available to LEEDuser premium members. Start a free trial »

(If you're already a premium member, log in here.)

My building has 80 AHUs providing ventilation to building spaces. Do I have to do the ventilation calculations and conduct outdoor air measurements for each one?

The answer to this question is available to LEEDuser premium members. Start a free trial »

(If you're already a premium member, log in here.)

What if after our Preliminary Review we have to revise the ventilation rate procedure calculations and find that we need to make corrections to the system in order to meet the prerequisite? Can we redo the outside air testing after making corrections? Would we need to update the performance period for all credits accordingly?

The answer to this question is available to LEEDuser premium members. Start a free trial »

(If you're already a premium member, log in here.)

Our building has a single fan that supplies outside air to multiple AHUs. Do we need to perform outside air testing at the supply fan or at all AHUs?

The answer to this question is available to LEEDuser premium members. Start a free trial »

(If you're already a premium member, log in here.)

We have a VAV system where single AHUs serve multiple zones. Do we need to take outside air measurements at each VAV box?

The answer to this question is available to LEEDuser premium members. Start a free trial »

(If you're already a premium member, log in here.)

See all forum discussions about this credit »

Addenda

4/9/2019Updated: 4/9/2019
Rating System Correction
Description of change:
Add the following language as a second paragraph "For spaces with mechanical exhaust, test and confirm proper operation of the exhaust systems as outlined in the current facilities requirements and operations and maintenance plan."
Campus Applicable
No
Internationally Applicable:
No
See all forum discussions about this credit »

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WSP - Built Ecology
Senior Sustainability Manager

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

Requirements

Maintain the ventilation system equipment and associated components based on Table 8.2 of ASHRAE 62.1-2016. Include information on ventilation system operation and preventative maintenance in the current facilities requirements and operations and maintenance plan required for compliance with EA prerequisite Energy Efficiency Best Management Practices.

For spaces with mechanical exhaust, test and confirm proper operation of the exhaust systems as outlined in the current facilities requirements and operations and maintenance plan.

Ventilate the project spaces mechanically or naturally as follows:

For mechanically ventilated spaces, measure the total quantity of outdoor air delivered and verify the results are within 10 percent of the rates outlined in the current facilities requirements and operations and maintenance plan. Measurements shall quantify the amount of outdoor air for each air handling unit serving the project. Measurements taken within five years prior to project submission are acceptable. The rates must meet the following minimum requirements for each air handling unit:

In I-P units:
Minimum outdoor air rate in cfm = 0.06 cfm/sf x gross building area (in sf) + people outdoor air rate from Table 1 (cfm/person) x building occupancy

In SI units:
Minimum outdoor air rate in L/s = 0.3 L/s*m2 x gross building area (in m2) + people outdoor air rate from Table 1 (L/s per person) x building occupancy

Table 1. People outdoor air rate
Occupancy category* People outhoor air rate
cfm per person L/s per person
Auditorium seating area Libraries Office space Places of religious worship 5 2.5
Mall common areas Museums 7.5 3.8
Classrooms Daycare General manufacturing 10 5
Health club/aerobics 20 10

*For additional occupancy categories, see Table 6.2.2.1 of ASHRAE 62.1-2016

Alternatively, the rates may meet the Ventilation Rate Procedure outlined in Section 6.2 of ASHRAE 62.1 editions 2016, 2013, 2010, or 2007.

For naturally ventilated spaces, meet the minimum requirements in Table 2:
Table 2. Minimum opening location and size requirements for naturally ventilated spaces*
Opening type Location of opening Size of opening
Maximum distance from operable openings** Minimum opening area***
Single side opening 2 x ceiling height 4% of floor area
Double side opening 5 x ceiling height 4% of floor area
Corner opening 5 x ceiling height (along a line drawn between the two openings that are farthest apart.; for floor area outside line, comply with single side opening)  4% of floor area

*Adopted from Section 6.4.1 of ASHRAE 62.1-2016
**For ceilings that are increasing in height as distance from the openings is increased, the ceiling height shall be determined as the average height of the ceiling within 6 m (20 ft) from the operable openings.
***If the window is covered with louvers, insect screens, or otherwise obstructed, the openable area must be based on the free unobstructed area through the opening.

Multifamily

For all common areas in the building, meet requirements above.

For residential units, have an operable window in each bedroom with the total openable window area a minimum of 4% of the room floor area or meet the following minimum requirements for the entire unit:

In I-P units:
Minimum outdoor air rate in cfm = 0.03 cfm/sf x dwelling unit floor area (in sf) + 7.5 cfm/person x (number of bedrooms + 1)

In SI units:
Minimum outdoor air rate in L/s = 0.15 L/s*m2 x dwelling unit floor area (in m2) + 7.5 cfm/person x (number of bedrooms + 1)

In each full bathroom, have either an exhaust fan that vents directly to the outdoors or an operable window.

Europe ACP: Arbeitsstaettenrichtlinie ASR 5
Projects in Europe may use Arbeitsstaettenrichtlinie ASR 5 or ASR A3.6 as a local equivalent to ASHRAE Standard 62.1-2010, natural ventilation procedure.
India ACP: Mechanically Ventilated
Projects in India may meet the following as a local equivalent to ASHRAE 62.1-2010:
  • For single-zone and 100% outside air systems, National Building Code of India 2005 (NBC 2005) Table 4-air rate requirements in lieu of ASHRAE 62.1-2010 ventilation rate procedure. Only certain space types are eligible.
  • Central Pollution Control Board (CPCB), National Ambient Air Quality Standards in lieu of ASHRAE 62.1-2010, Section 4.
  • NBC 2005 Part 8, section 3, clause 3.2, with additional parameters, in lieu of ASHRAE 62.1-2010, Minimum Requirements, Sections 5-7.
India ACP: Naturally Ventilated NBC
Projects in India may use NBC 2005 Part 8, Section 1, clauses 5.2.1-5.6 and Appendix A: Design for Natural Ventilation from Handbook on Functional Requirements of Buildings (other than Industrial Buildings), also known as SP 41, 1987 as a local equivalent to ASHRAE Standard 62.1-2010, natural ventilation procedure.
India ACP: Naturally Ventilated CPCB
Projects in India may compare outdoor air quality with the CPCB National Ambient Air Quality Standards in lieu of the U.S. national air quality standards as required in ASHRAE Standard 62.1-2010, Section 4.

In the end, LEED is all about documentation. LEEDuser’s Documentation Toolkit, for premium members only, saves you time and helps you avoid mistakes with:

  • Calculators to help assess credit compliance.
  • Tracking spreadsheets for materials purchases.
  • Spreadsheets and forms to give to subs and other team members.
  • Guidance documents on arcane LEED issues.
  • Sample templates to help guide your narratives and LEED Online submissions.
  • Examples of actual submissions from certified LEED projects.

How do I find whether my project is located in a non-attainment area for particulate matter or exceeds the prerequisite ozone requirements?

The answer to this question is available to LEEDuser premium members. Start a free trial »

(If you're already a premium member, log in here.)

The outdoor air intake for our ventilation system is not accessible, and it’s not possible to measure the outdoor airflow directly. How can we determine the outdoor airflow for this system?

The answer to this question is available to LEEDuser premium members. Start a free trial »

(If you're already a premium member, log in here.)

What if our systems do not meet the required outside air when systems are tested at worst-case conditions?

The answer to this question is available to LEEDuser premium members. Start a free trial »

(If you're already a premium member, log in here.)

Our system cannot provide enough outdoor air due to design limitations. What should we do?

The answer to this question is available to LEEDuser premium members. Start a free trial »

(If you're already a premium member, log in here.)

My building has 80 AHUs providing ventilation to building spaces. Do I have to do the ventilation calculations and conduct outdoor air measurements for each one?

The answer to this question is available to LEEDuser premium members. Start a free trial »

(If you're already a premium member, log in here.)

What if after our Preliminary Review we have to revise the ventilation rate procedure calculations and find that we need to make corrections to the system in order to meet the prerequisite? Can we redo the outside air testing after making corrections? Would we need to update the performance period for all credits accordingly?

The answer to this question is available to LEEDuser premium members. Start a free trial »

(If you're already a premium member, log in here.)

Our building has a single fan that supplies outside air to multiple AHUs. Do we need to perform outside air testing at the supply fan or at all AHUs?

The answer to this question is available to LEEDuser premium members. Start a free trial »

(If you're already a premium member, log in here.)

We have a VAV system where single AHUs serve multiple zones. Do we need to take outside air measurements at each VAV box?

The answer to this question is available to LEEDuser premium members. Start a free trial »

(If you're already a premium member, log in here.)

4/9/2019Updated: 4/9/2019
Rating System Correction
Description of change:
Add the following language as a second paragraph "For spaces with mechanical exhaust, test and confirm proper operation of the exhaust systems as outlined in the current facilities requirements and operations and maintenance plan."
Campus Applicable
No
Internationally Applicable:
No

LEEDuser expert

Ben Stanley

WSP - Built Ecology
Senior Sustainability Manager

See all LEEDuser forum discussions about this credit » Unsubscribe from discussions about EBOM-v4.1 EQp1