Entry Type ID Date Applicable Rating System Primary Credit Inquiry (LIs) Ruling (LIs) Related Addenda/LIs Related Resources Campus Applicable Internationally Applicable Country Applicability Reference Guide (Addenda) Page (Addenda) Location (Addenda) Description of Change (Addenda) "Reference Guide Correction" "100000103" "2010-04-14" "Commercial Interiors" "None" "None" "Green Interior Design and Construction, 2009 edition" "288" "13. Definitions, Breathing zone" "Replace the text with ""Breathing zone is the region within an occupied\nspace between 3 and 6 feet above the floor. Note that this definition\nvaries from that of ASHRAE 62.1-2007, which states that the breathing\nzone is between 3 inches and 6 feet from the floor, and 2 feet from the\nwalls as well as fixed air conditioning equipment.""" "Reference Guide Correction" "100000101" "2009-11-02" "Commercial Interiors" "None" "None" "Green Interior Design and Construction, 2009 edition" "283" "4. Implementation" "In the second line of the third paragraph, replace ""EA"" with ""IEQ"" so the text becomes ""...compliance with IEQ Prerequisite 2...""" "Rating System Correction, Reference Guide Correction" "100000100" "2010-04-14" "Commercial Interiors" "None" "minimum IAQ performance addenda 04/14/2010" "Green Interior Design and Construction, 2009 edition" " Rating System: 37, Reference Guide: 281" "Requirements" "Remove all section text and replace with new text as indicated in the supplemental documentation." "Reference Guide Correction" "100000102" "2009-11-02" "Commercial Interiors" "None" "None" "Green Interior Design and Construction, 2009 edition" "284" "Mechanically Ventilated Spaces" "In the third line of the first paragraph, replace the word ""rocedure"" with ""procedure"" so the text becomes ""...ventilation rate procedure is...""" "Global ACP" "100001528" "2012-10-01" "Commercial Interiors, Retail - Commercial Interiors" "None" "None" "X" "Green Interior Design and Construction, 2009 edition $ Green Interior Design and Construction, 2009 edition, updated June 2011 $ Retail Supplement to Green Interior Design and Construction, 2009 edition" "CI RS 37, Retail CI RS 35" "Case 1" "Add ""OPTION 1. ASHRAE Standard 62.1-2007 or Non-U.S. Equivalent"" directly under ""CASE 1. Mechanically Ventilated Spaces""" "Global ACP" "100001529" "2012-10-01" "Commercial Interiors, Retail - Commercial Interiors" "None" "None" "X" "Green Interior Design and Construction, 2009 edition $ Green Interior Design and Construction, 2009 edition, updated June 2011 $ Retail Supplement to Green Interior Design and Construction, 2009 edition" "CI RS 37, Retail CI RS 35" "Case 1" "Add ""Projects outside the U.S. may use a local equivalent to ASHRAE Standard 62.1-2007 for breathing zone minimum ventilation rates."" to the end of the first paragraph." "Global ACP" "100001530" "2012-10-01" "Commercial Interiors, Retail - Commercial Interiors" "None" "None" "X" "Green Interior Design and Construction, 2009 edition $ Green Interior Design and Construction, 2009 edition, updated June 2011 $ Retail Supplement to Green Interior Design and Construction, 2009 edition" "CI RS 37, Retail CI RS 35" "Case 1" "Add the following after the first paragraph: ""OR OPTION 2. CEN Standard EN 15251: 2007 Projects outside the U.S. may modify or maintain each outside air intake, supply air fan and/or ventilation distribution system to supply at least the outdoor air ventilation rate required by Annex B of Comit" "Global ACP" "100001531" "2012-10-01" "Commercial Interiors, Retail - Commercial Interiors" "None" "None" "X" "Green Interior Design and Construction, 2009 edition $ Green Interior Design and Construction, 2009 edition, updated June 2011 $ Retail Supplement to Green Interior Design and Construction, 2009 edition" "CI RS 37, Retail CI RS 35" "Case 1" "Replace ""ASHRAE Standard 62.1-2007 (with errata but without addenda)"" with ""the above standards"" in the last paragraph of the case." "LEED Interpretation" "10096" "2011-08-01" "New Construction, Core and Shell, Schools - New Construction, Retail - New Construction, Healthcare, Data centers - New Construction, Hospitality - New Construction, Commercial Interiors, Retail - Commercial Interiors, Existing Buildings, Schools - Existing Buildings, Retail - Existing Buildings" "This project is a renovation of an existing building on a university campus. This building is one of a series of buildings constructed in the early 1960\'s, and the University is attempting to maintain the character and cohesiveness of the campus by preserving the existing structures and facades. Preserving the buildings also contributes to our sustainable design efforts, but it has resulted in an issue with the prerequisite for indoor air quality. The basement and first floor levels are mechanically ventilated in accordance with ASHRAE 62.1, and do not present a problem. However, running ductwork to the upper floors did prove problematic, so the design team is relying upon natural ventilation for the second and third floors. After calculating the window ventilation areas, all but three of the rooms comply with ASHRAE 62.1 for natural ventilation. The three rooms in question obtain 74%, 77% and 78% of the required ventilation area for operable windows.\n\nIn order to meet University requirements and LEED Criteria all windows will be replaced with new, energy star models, to match the size and appearance of the existing windows. As previously mentioned, these new windows will generally provide 100% opening requirements, except in the three cases noted.\n\nIt is the University\'s intent, as the Authority Having Jurisdiction, to grant a waiver for the minimum ventilation requirement in only these three rooms, thereby permitting the maximum use of the facility, while maintaining the historic appearance of the building.\n\nThe University has therefore requested an interpretation from USGBC that this waiver for reduced ventilation requirements will be acceptable for obtaining LEED Certification for these facilities." "The applicant is requesting a waiver from the ASHRAE 62.1-2007 Section 5.1 natural ventilation prescriptive requirements for three rooms within the existing building. The new window areas are insufficient to meet the prescriptive requirements and are specified and installed per university requirements. ASHRAE 62.1-2007 exempts engineered natural ventilation systems when approved by the authority having jurisdiction. The natural ventilation system, as described, does not appear to be an engineered system. In this case, the prescriptive requirements could not be waived." "None" "None" "LEED Interpretation" "10144" "2011-11-01" "New Construction, Existing Buildings, Commercial Interiors, Core and Shell, Schools - New Construction, Retail - New Construction, Retail - Commercial Interiors, Healthcare" "How do naturally ventilated projects, such as high rise residential projects, that do not qualify with the requirements of the Ventilation Rate Procedure, or ASHRAE 62.1 Section 5.1, or CIBSE Applications Manual 10 meet IEQp1 for v2 and 2009 rating systems?" "For projects that do not qualify with the requirements of the Ventilation Rate Procedure, or ASHRAE 62.1 Section 5.1, or CIBSE Applications Manual 10, and are pursuing an engineered ventilation system (e.g. a combination of natural ventilation with mechanical exhaust, or some other means of assisting the outside airflow through the openings and circulating it through the occupiable space), the following expectations apply:Compliance when the local ventilation code governing the project is ASHRAE 62.1-2007 (or 2004 for LEED-v2 projects): We understand that many local jurisdictions would not be willing to provide confirmation that your engineered natural ventilation approach meets the intent of ASHRAE 62.1-2007. Therefore, in locations where ASHRAE 62.1-2007 is required for local ventilation code compliance, it would be sufficient to document that the plans and specifications that use the engineered natural ventilation approach have been approved by the local code authority in order to show compliance with EQ Prerequisite 1. The documentation required for EQp1 would include confirmation that all of the mandatory requirements of ASHRAE 62.1 have been met, a narrative describing the engineered ventilation modeling approach, evidence documenting that the plans have been approved by the local code authority, and some form of evidence that ASHRAE 62.1-2007 (or a later version of ASHRAE 62.1) is required for local building code compliance.Compliance when the local ventilation code governing the project can be documented to be at least as stringent as ASHRAE 62.1-2007 (or 2004 for LEED-v2 projects):If the local code requirements relative to ventilation are governed by an alternate code (any code other than ASHRAE 62.1-2007 (2004 for LEED-v2) or a later version of ASHRAE 62.1), then the project team must provide evidence that this alternate code is at least as stringent than ASHRAE 62.1-2007 (2004 for LEED-NCv2) in its entirety. If this documentation could be provided, then the approval of the local code authority would be sufficient to document compliance with the prerequisite requirements. Using this methodology, the documentation required for EQp1 would include documentation showing that the alternate code is at least as stringent than ASHRAE 62.1-2007 (2004 for LEED-v2) in its entirety, confirmation that all of the mandatory requirements of the alternate code have been met, a narrative describing the engineered ventilation modeling approach, and evidence documenting that the plans have been approved by the local code authority. Compliance when the local ventilation code governing the project cannot be documented to be at least as stringent as ASHRAE 62.1-2007: If the documentation described above cannot be provided, then, for purposes of LEED Certification, USGBC/GBCI would serve as the Authority Having Jurisdiction [since the local code authority does not have jurisdiction over ASHRAE 62.1-2007 (2004 for LEED-v2) or a ventilation standard of equivalent stringency]. In this case, the project team would be required to submit documentation showing that the intent of ASHRAE 62.1-2007 (2004 for LEED-v2) has been met with the project\'s engineered natural ventilation system. This documentation must clearly identify how the natural ventilation requirements stipulated in ASHRAE 62.1-2007 (2004 for LEED-v2) Section 5.1 have not been met (e.g. smaller operable window area, larger distance from operable windows or openings, etc.). The documentation must also clearly identify how the ventilation design has been engineered to meet the intent of ASHRAE 62.1 where the requirements of Section 5.1 have not been met. For example, if the distance from windows or openings is more than 25 feet, is there an exhaust air fan located at the furthest distance from the windows that is inducing the outdoor air to flow through the space; is that exhaust fan flow equivalent to the outside airflow that would be required for the space if the Ventilation Rate Procedure were used? If the window area is less than 4% of the floor area, is the space designed with cross-ventilation to ensure adequate airflow? Drawings and some calculations or air flow analyses will be required in addition to the narrative describing the engineered ventilation approach to justify this approach. For projects that have not yet entered the review process, it is highly recommended that this be provided in a project-specific credit interpretation request in order to achieve prior approval of the engineered natural ventilation approach rather than waiting until the system has been fully designed to pursue approval of this method.Below are some specific examples of the types of documentation that would be required if using this compliance approach; but these examples are not intended to apply to every possible engineered ventilation solution:For example, in high rise residential, the team must identify any occupiable spaces (excluding coat closets and entry vestibules) in the residential units that are more than 25 feet away from the operable windows, that are interior spaces with unobstructed free area from adjacent rooms that is less than 8% of the area of the interior room, or that have operable window openings that totals less than 4% of the total naturally ventilated floor area. A narrative and/or calculations should be provided explaining how mechanical ventilation or a combination of mechanical ventilation and natural ventilation are used to meet the ventilation requirements for those spaces. For spaces or portions of spaces that are ventilated using mechanical ventilation or a combination of mechanical and natural ventilation, the documentation must show compliance with the ventilation rates indicated in Table 6-1 of ASHRAE 62.1-2007 (2004 for LEED-v2) and the Ventilation Rate Procedure calculations indicated in Section 6.2, using appropriate values for zone air distribution effectiveness (Ez.)For high-rise residential projects attempting to show compliance for EQp1 using positively pressurized corridors that are provided with excess outdoor air [above ASHRAE 62.1-2007 (2004 for LEED-v2) minimum requirements] that is to be transferred into each living unit either via undercuts in the entry doors, transfer air grilles, or some other means, the project team must document that all mechanically ventilated spaces will meet the minimum ventilation requirements of ASHRAE 62.1-2007 (2004 for LEED-v2) Section 6.2. For projects utilizing bathroom or other exhaust to negatively pressurize the unit to draw in excess ventilation air from the corridors, if the primary makeup air source for the unit exhaust is designed to be provided through the apartment entrance/vestibule, the project team should sufficiently demonstrate that the makeup air is outdoor air and not relief air (or previously ""used"" outside air) from other occupied spaces in the building and that the exhaust operates continuously. Additionally, note that for the case of makeup air provided from the apartment entrance, the makeup air may substantially short-circuit the space requiring mechanical ventilation depending on the location of the air entry point and the exhaust grilles, and therefore an appropriate air distribution effectiveness (Table 6-2) must be considered (see example 6-H from the ASHRAE 62.1-2007 User\'s Manual - p. 6-20, where a zone air distribution effectiveness of 0.5 is utilized.)" "EQp1 nat vent LI" "None" "LEED Interpretation" "10165" "2012-04-01" "New Construction, Existing Buildings, Commercial Interiors, Core and Shell, Retail - New Construction, Retail - Commercial Interiors, Healthcare" "Can projects use the natural ventilation prescriptive dimensional requirements written in 62.1-2010, instead of those in ASHRAE 62.1-2007? This would allow some spaces to comply with the requirements where they may otherwise not if 62.1-2007 is applied. If so, are we required to comply with the standard as a whole? Applying the standard as whole would have serious implications for new construction or existing projects attempting to comply with the Natural Ventilation Procedure because in some instances mechanical ventilation systems would have to be installed to meet the prerequisite." "For LEED 2009 projects where ASHRAE 62.1-2007 is the applicable standard for compliance with IEQp1, project teams may substitute the geometric requirements of ASHRAE 62.1-2010 sections 6.4.1 through 6.4.2 in place of ASHRAE 62.1-2007 section 5.1.1.\n\n **Update October 1, 2013: This ruling also applies to EQp1 in LEED 2009 for Schools." "None" "None" "LEED Interpretation" "10247" "2012-10-01" "New Construction, Core and Shell, Schools - New Construction, Retail - New Construction, Healthcare, Commercial Interiors, Retail - Commercial Interiors, Existing Buildings" "We are meeting the IEQp1: Minimum Indoor Air Quality Performance with Option 2, CEN standards EN 15251:2007 and EN 13779:2007. The CEN standards provide minimum outdoor air requirements for most spaces but refer to local codes for certain specialty spaces such as parking garages. To meet the intent of the prerequisite, we propose using our local code requirements for garages, which is Teil 5 Garagen (“Section 5 – Parking Garages”) of the Verordnung über Bau und Betrieb von Sonderbauten - Nordrhein-Westfalen (“Local Law of North Rhine-Westphalia for the Construction and Operation of Specialty Buildings”), dated 17 November 2009 (SBauVO). To meet this local code, our design will use demand control ventilation with carbon monoxide (CO) detectors to limit the CO concentration. Is this approach acceptable?" "**Update 10/01/2014: Ruling has been reversed\n\n Yes, garage demand control ventilation is an acceptable ventilation approach for parking garages. This approach is acceptable for projects pursuing Option 2 (EN 15251 and EN 13779) of EQ Prerequisite Minimum Indoor Air Quality Performance as well as the hazardous exhaust requirements in EQ Credit Indoor Chemical and Pollutant Source Control. The demand control ventilation strategy must meet the following requirements:\n\n " "2122, 10402" "None" "X" "LEED Interpretation" "10248" "2012-10-01" "New Construction, Core and Shell, Existing Buildings, Retail - New Construction, Retail - Commercial Interiors, Commercial Interiors, Healthcare" "Our project is a mixed use facility with a combination of a high-rise (21-story) and mid-rise (6-story) residential apartment building. Our project utilizes all electric cooking appliances; there is no gas within the dwelling units. Table 6-4 of ASHRAE 62.1-2007 indicates 100 CFM of intermittent exhaust should be provided for residential kitchens. However, Table 6-4 also indicates that residential kitchen exhaust is Class 2 air, and ASHRAE 62.1-2007 section 5.17.3.2 indicates that Class 2 air can be re-circulated within the space. Please confirm that re-circulating kitchen hoods meet the IEQp1 prerequisite (which requires the 100 CFM of intermittent exhaust). We would also like to know if re-circulating hoods are acceptable for both mechanically ventilated and naturally ventilated apartments, since we may have both in our project. We believe re-circulated hoods should be acceptable to meet the exhaust requirements based on ASHRAE 62.1-2007 section 5.17.3.2, but wanted to confirm since this is a prerequisite." "The applicant is requesting confirmation that recirculating kitchen hoods meet the kitchen exhaust requirements of ASHRAE 62.1-2007 for IEQp1 in both mechanically and naturally ventilated kitchens. For mechanically ventilated kitchens, the exhaust rates listed in Table 6-4 of ASHRAE 62.1-2007 are by definition required to be discharged to outside the building (per Section 3 air, exhaust: air removed from a space and discharged to outside the building). Although recirculation of Class 2/3 air is permissible per section 5.17.3.2/5.17.3.3, the Table 6-4 exhaust requirements must still be provided (to outside the building) to meet the minimum requirements of Section 6 of ASHRAE 62.1-2007. Therefore recirculating hoods alone do not meet the exhaust requirements of Table 6-4 of the standard for mechanically ventilated kitchens. Additionally, LEED Interpretation 2208 (CIR ruling dated 6/25/2008) referenced in the inquiry, is indicated within the LEED Interpretation database as NOT applicable to the LEED NCv2009 rating system.\nIn regards to naturally ventilated kitchens, natural ventilation systems designed in accordance with Section 5.1 of the standard do not need to meet the mechanical ventilation (exhaust) requirements of Table 6-4. \n\nNote, the exhaust requirements of Table 6-4 were clarified by ASHRAE through addendum O, which states ""...exhaust requirements apply to all zones and/or systems regardless of the method used to determine minimum outdoor airflow rates (Ventilation Rate Procedure, IAQ Procedure, or Natural Ventilation Procedure)."" Projects have the option to follow the ASHRAE 62.1-2007 addendum but it is not required." "None" "None" "LEED Interpretation" "2043" "2008-02-12" "New Construction, Schools - New Construction, Commercial Interiors, Core and Shell, Existing Buildings" "Description We are planning to construct an apparel factory for LEED certification. The planned factory will have 1000 sewing machines and few finishing equipments among others. The entire space will be air conditioned to maintain ASHRAE comfort levels. The occupation density is 20-25 persons per 1000 square feet. Proposal Since there is no specified category in ASHRAE 62.1-2004 \'Ventilation for Acceptable Indoor Air Quality\' for apparel industry, we are proposing to use \'data entry\' category listed under office buildings which is similar (200W sewing machine with operator seated similar to data entry). This allows 5cfm per person with 0.06cfm per square feet. Please rule on the acceptability of this approach." "The CIR is asking for verification that they have selected the appropriate Occupancy Category for their project, given that it does not fall precisely within the categories listed in ASHRAE 62.1-2004. ASHRAE instructs that if the occupancy category for a proposed space or zone is not listed, the requirements for the listed occupancy category that is most similar in terms of occupant density, activities and building construction shall be used. It is up to the discretion of the design team to select the most appropriate alternative. It would be beneficial to the LEED reviewer if, included with the prerequisite submission, the applicant provides an explanation of their rationale for the selection. Applicable Internationally. " "None" "None" "X" "Form Update" "5000019" "2014-10-01" "New Construction, Core and Shell, Schools - New Construction, Retail - New Construction, Healthcare, Data centers - New Construction, Hospitality - New Construction, Warehouse and distribution centers - New Construction, Commercial Interiors, Retail - Commercial Interiors, Hospitality - Commercial Interiors, Existing Buildings, Schools - Existing Buildings, Retail - Existing Buildings, Data centers - Existing Buildings, Hospitality - Existing Buildings, Warehouse and distribution centers - Existing Buildings" "None" "Minimum Indoor Air Quality Performance Calculator" "New calculator for projects performing the ASHRAE 62.1 ventilation rate procedure calculations required for EQ Prerequisite Minimum Indoor Air Quality Performance. This optional calculator can be used for LEED 2009 and LEED v4 projects and is an alternative to the ASHRAE 62.1 62MZCalc and previous 100% outdoor air and single zone calculators."