This prerequisite establishes a baseline for providing a minimum amount of outdoor air to buildings in order to maintain good indoor air quality and keep occupants comfortable and healthy.
The referenced standard is ASHRAE 62.1-2010, which is a newer version than that referenced in LEED 2009. ASHRAE 62.1-2010 is often more stringent than local building codes, although it is not likely to entail any added costs.
The prerequisite has different compliance paths for mechanically ventilated and naturally ventilated spaces, and you may need to follow both paths for the same building on a space-by-space basis. In fact, teams should beware that ASHRAE 62.1-2010 effectively prohibits natural ventilation via operable openings as a stand-alone strategy. This is because the standard requires spaces to be mechanically ventilated whenever the operable windows are closed. Multifamily residential buildings may be most impacted by this type of scenario.
If the building relies on the fans for daily ventilation, it is considered a mechanically ventilated building.
Local codes may be used to meet the prerequisite if you can show equivalency with Sections 4 through 7 of ASHRAE Standard 62.1-2010. Alternatively, international projects can choose to comply with the minimum requirements of Annex B of CEN Standard EN 15251–2007, and meet the requirements of CEN Standard EN 13779–2007 excluding Sections 7.3, 7.6, A.16, and A.17.
To contribute to the comfort and well-being of building occupants by establishing minimum standards for indoor air quality (IAQIndoor air quality: The quality and attributes of indoor air affecting the health and comfort building occupants. IAQ encompasses available fresh air, contaminant levels, acoustics and noise levels, lighting quality, and other factors.).
Meet the requirements for both ventilation and monitoring.
For mechanically ventilated spaces (and for mixed-mode systems when the mechanical ventilation is activated), determine the minimum outdoor air intake flow for mechanical ventilation systems using the ventilation rate procedure from ASHRAE 62.1–2010 or a local equivalent, whichever is more stringent.
Meet the minimum requirements of ASHRAE Standard 62.1–2010, Sections 4–7, Ventilation for Acceptable Indoor Air Quality (with errata), or a local equivalent, whichever is more stringent.
Projects outside the U.S. may instead meet the minimum outdoor air requirements of 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; and meet the requirements of CEN Standard EN 13779–2007, Ventilation for nonresidential buildings, Performance requirements for ventilation and room conditioning systems, excluding Section 7.3, Thermal environment; 7.6, Acoustic environment; A.16; and A.17.
For naturally ventilated spaces (and for mixed-mode systems when the mechanical ventilation is inactivated), determine the minimum outdoor air opening and space configuration requirements using the natural ventilation procedure from ASHRAE Standard 62.1–2010 or a local equivalent, whichever is more stringent. Confirm that natural ventilation is an effective strategy for the project by following the flow diagram in the Chartered Institution of Building Services Engineers (CIBSE) Applications Manual AM10, March 2005, Natural Ventilation in Nondomestic Buildings, Figure 2.8, and meet the requirements of ASHRAE Standard 62.1–2010, Section 4, or a local equivalent, whichever is more stringent. [Europe ACP: Arbeitsstaettenrichtlinie ASR 5] [Latin America ACP: Engineered Natural Ventilation Systems]
The indoor air quality procedure defined in ASHRAE Standard 62.1–2010 may not be used to comply with this prerequisite.
For mechanically ventilated spaces (and for mixed-mode systems when the mechanical ventilation is activated), monitor outdoor air intake flow as follows:
For naturally ventilated spaces (and for mixed-mode systems when the mechanical ventilation is inactivated), comply with at least one of the following strategies.
In addition to the requirements above, if the project building contains residential units, each dwelling unit must meet all of the following requirements.
Cities in Canada that have been proven to have an average radon concentration of 4 pCi/L (150 Bq/m3) or less through testing in accordance with the Health Canada Guide for Radon Measurements in Dwellings (with a minimum of 50 tests) are considered equivalent to EPA Radon Zone 2, and therefore are exempted from the radon requirements of this prerequisite.
Projects in Europe may use Arbeitsstaettenrichtlinie ASR 5 as a local equivalent to ASHRAE Standard 62.1-2010, natural ventilation procedure.
Projects in Latin America may follow the Verification Protocol for Engineered Natural Ventilation Systems in Equitorial Climates and receive a design review and approval from the Colombian Professional Association of Air-conditioning, Ventilation and Refrigeration (ACAIRE).
The Minimum Indoor Air Quality Performance Calculator can be used for projects using ASHRAE 62.1 to comply with LEED BD+C, ID+C and O+M EQ Prerequisite Minimum Indoor Air Quality Performance, EQ Credit Increased Ventilation, and EQ Credit Enhanced Indoor Air Quality Strategies, Option 2, Strategy B: Increased Ventilation, as well as LEED Homes and Multifamily Midrise EQ Prerequisite Ventilation. The calculator accommodates all ventilation types (multiple zone, single-zone, 100% outside air) in one spreadsheet. Assumptions for occupancy categories are from ASHRAE 62.1-2010 (for LEED v4 projects) and ASHRAE 62.1-2007 (for LEED 2009 projects).
In the office the air (cold in summer, warm in winter) is both wall supplied and ceiling supplied. The air is exhausted from the WCs. From the offices the air passes through the doors and through a corridor. Which value is appropriate for the Zone Air Distribution Effectiveness?
Your worst case scenario is heating mode with warm air supplied from the ceiling. Therefore, your Ez will be 0.8.
Indirect measurements such as temperature or current transducers are not allowed for VAVVariable Air Volume (VAV) is an HVAC conservation feature that supplies varying quantities of conditioned (heated or cooled) air to different parts of a building according to the heating and cooling needs of those specific areas. systems, but is it allowable to measure the pressure difference over the fan and calculate outdoor air volume from that which has been approved manner in previous LEED versions? Or does it have to be a separate meter?
VAVVariable Air Volume (VAV) is an HVAC conservation feature that supplies varying quantities of conditioned (heated or cooled) air to different parts of a building according to the heating and cooling needs of those specific areas. systems need a way to measure outdoor airflow under varying load conditions. Typically that is done with an airflow station, directly measuring outdoor airflow. If you have an alternative approach and you can demonstrate it provides the same result it should be acceptable.
Pre-LEED, projects often only monitored damper position to maintain a fixed percentage of outdoor air. The problem with that approach is that if the VAV system was operating at 50% load, you'd also end up reducing ventilation by 50%. So you need to make sure your approach adjusts and is accurate at part load.
Art classrooms are considered both in Tab. 6-1 and in Tab. 6-4. If we respect Tab. 6-4, could we avoid the verification of Tab. 6-1 (i.e. could we avoid the outdoor air supply)?
Why you would want to do that?
My reading of 62.1-2010 is that you must meet both requirements. And what goes out must be replaced somehow.
I would like to know if it is mandatory to comply with minimum exhaust rates indicated in TTABLE 6-4 Minimum Exhaust Rates from ASHRAE 60.1 -2010.
We think that the exhaust rate for each private toilet room (25 cfm/unit) is excessive for the areas we are considering and may cause discomfort in this area.
Thank you in advance!
You are required to "meet the minimum requirements of ASHRAE Standard 62.1–2010, Sections 4–7". That includes the exhaust requirements of Table 6-4.
Thank you Christopher. I am still having trouble to understand what rate to use. We are designing an office building with restrooms having 2 or more WC. So if using exhaustion in a non continuous system operation we would need a 50 cfm rate, considering this is a private usePrivate use applies to plumbing fixtures in residences, apartments, and dormitories, to private (non-public) bathrooms in transient lodging facilities (hotels and motels), and to private bathrooms in hospitals and nursing facilities.. Am I correct? We think this might be to excessive for the volume of the restroom, maybe we might need to adjust the height. Thank you
Public toilets are required to have continuous exhaust (Note E only applies to private toilet rooms). Although ASHRAE 62 does not explicitly define the terms, In an office building I would expect the toilet rooms to be public unless they are part of some individual's private office. A toilet room that serves an entire company, for example, would be "public" even if you couldn't come in off the street to use it.
I can't imagine 50 CFM per fixture being excessive.
For a Multi-Fam Highrise, the corridors will be heated with a ducted roof-top gas furnace split dx system will be installed. No other combustion equipment nor combustion appliances will be located in the corridors or in the Res dwellings. Do the roof-top ducted gas-heat units for the corridors trigger the requirement for CO sensors to be located on each floor and in each Res dwelling?
ASHRAE 62.1-2010 does not address CO sensors, but the LEED BDC Reference Guide does include special language for CO sensors in residential buildings. By my reading of the RG, Carbon Monoxide sensors must be installed on each floor of the residential units regardless of HVAC system type.
This is in line with other building and life safety codes that are concerned about preventing deaths from things like indoor grilling, or indoor use of generators (both surprisingly common).
Our project is mechanically ventilated by 100% OA constant volume enthalpy heat recovery ventilator. Regarding monitoring, according to LEED reference guide, in our case, monitoring by current transducer on the supply fan, an air flow switch, or similar monitoring device is acceptable. In order to meet the requirement, is it OK to monitor just the ventilation fan is operated or not, or is measurement required? Any comment would be appreciated.
If it is constant volume you should be fine with a balancing report and fan status. You don't need ongoing airflow measurement.
Hello - I am working on a new construction VA Medical Center that has been designed using the ventilation rates in ASHRAE Standard 170-2008 as per the v4 NC-Healthcare. Can we still qualify for this prerequisite under NC BD+C, since we clearly meet the "minimum requirements" of 62.1? The difference is that we did not determine the minimum outdoor air intake flow using the 62.1 ventilation rate procedure. We used 170. We would prefer to use NC BD+C for this project. Thank you.
Seems logical that you could use 170 as an ACP to 62.1. Might want to submit an inquiry, now, and confirm.
We have several high rise residential projects that use a several conditioning and ventilation system. Typically the dwelling units are ventilated using whole house exhaust and permanent openings in the windows. The units also have operable windows, but not all of the floor area will comply with natural ventilation requirements. I assume this would be considered a 100% outside air system - but none of the monitoring options seem to apply. What would be an acceptable monitoring method for an exhaust based ventilation system?
If the exhaust system is drawing in the ventilation air, could you install monitoring per the guidance on the second bullet point for constant volume systems? Install a current transducer on the supply fan, an
airflow switch, or similar monitoring device?
Only in this case, the monitoring device would be installed on the exhaust fan. I haven't seen this type of strategy implemented on a project yet and would be curious to see what others would suggest.
I don't see why that would not work, but since it is not a compliance path mentioned under mechanical ventilation, I was wondering if they were deliberately trying to exclude exhaust induced ventilation. ASHRAE 62.1-2010 clearly allows it though.
I received clarification yesterday from a LEED reviewer that a monitoring device on the exhaust fan would be acceptable - as required for a CV system. I am not sure how we will do this, since we don't have a central control system for the dwelling unit fans. We are researching some options, but if anyone has any ideas, we would love to hear about it.
Also, the reviewer directed us to LI #10416 that allows the use of ASHRAE 62.1-2013 in lieu of 2010. However, addendum 'a' revises the scope of the standard to exclude non-transient residential occupancies. ASHRAE 62.2-2013 has a corresponding addendum "g" which revises the scope of that standard to ALL residential buildings - including high rise. Base on this ruling and the addenda, ASHRAE 62.2-2013 may be used for v2009 and v4 multifamily high-rise projects for dwelling unit ventilation compliance.
We are working on a project where the ozone levels exceed the most recent three year average, so we must include air-cleaning devices for ozone. Does anybody have any guidance for this requirement? Should they be integrated in the AHU1.Air-handling units (AHUs) are mechanical indirect heating, ventilating, or air-conditioning systems in which the air is treated or handled by equipment located outside the rooms served, usually at a central location, and conveyed to and from the rooms by a fan and a system of distributing ducts. (NEEB, 1997 edition)
2.A type of heating and/or cooling distribution equipment that channels warm or cool air to different parts of a building. This process of channeling the conditioned air often involves drawing air over heating or cooling coils and forcing it from a central location through ducts or air-handling units. Air-handling units are hidden in the walls or ceilings, where they use steam or hot water to heat, or chilled water to cool the air inside the ductwork.? Or could they be placed directly in the room?
I think that filtration utilizing activated carbon and installed at the AHU1.Air-handling units (AHUs) are mechanical indirect heating, ventilating, or air-conditioning systems in which the air is treated or handled by equipment located outside the rooms served, usually at a central location, and conveyed to and from the rooms by a fan and a system of distributing ducts. (NEEB, 1997 edition)
2.A type of heating and/or cooling distribution equipment that channels warm or cool air to different parts of a building. This process of channeling the conditioned air often involves drawing air over heating or cooling coils and forcing it from a central location through ducts or air-handling units. Air-handling units are hidden in the walls or ceilings, where they use steam or hot water to heat, or chilled water to cool the air inside the ductwork. might be the way to go. Here's a link to a study that supports activated carbon filtration as an effective method to remove ozone. http://www.osti.gov/scitech/biblio/1050670/
Thank you very much Ben! I think I missed the reply notification but this helps so much!
We are certifing a project with two buildings, the first is an offices, the second is a warehouses to rent in Spain.
The question is for the warehouse, this warehouse is not conditioned and the spain law (and UE) doesn't require ventilation for this type of buildings.
We don't Know the use, because it is for rent.
The question is:
To meet the crèdit -Minimum Indoor Air Quality Performance- and Leed V.4
does warehouses require ventilation? and if the answer is yes, with natural ventilation is it enough? or require mechanical ventilation?
Yes, for sure the warehouse needs to be ventilated.
The warehouse can be either naturally or mechanically ventilated, it's your call.
If the space is going to be rented and the ventilation is beyond your project's scope of work, you have to demonstrate how this requirement will be enforced, typically by means of a binding clause in the tenant lease agreement.
A project is provided with perimeter induction units with internal coils for cooling and heating. Central dedicated 100% outdoor air handling unit feeds the induction units with fresh air, and the perimeter units induce own space return. So, for the induction unit, fraction of local recirculation air the is representative of system RA is 0. i.e. Er = 0.
Also, even though the induction unit has own coils for cooling and heating, they are for conditioning space returns only because it intakes fresh air from central DOAS which already conditioned.
If that is the case, do I need to prepare separate 62.1 calculation sheets for each perimeter unit because it has own coils assuming they are as individual ventilation system?
Or, I assume the induction unit coils as separate coils for space return only and does not affect space ventilation. So, how about ignoring the space coils and prepare one calculation sheet from a point of view of central DOAS only because it provides all the fresh air to perimeter units?
Did you confirm the appropriate approach for this situation?
Normally, the system level is defined to be the point at which outdoor air is mixed with return air. In this case it sounds like that would be at each individual induction unit.
But, maybe if you only considered the primary airflow (outdoor air) at the DOAS and the induction units in the calculation and did not account for the local recirculated air, you might be able to set it up as a single system.
I'd confirm the approach with GBCIThe Green Building Certification Institute (GBCI) manages Leadership in Energy and Environmental Design (LEED) building certification and professional accreditation processes. It was established in 2008 with support from the U.S. Green Building Council (USGBC). before finalizing the documentation.
Multiple identical RTUs combined with plenum ducts serve a whole building.
How can I prepare 62.1 MZcal?
Can I add up cfm of all RTUs and assume it like one system using one sheet?
Or, separate sheet for each RTU is required? But it is unclear how to split spaces per each RTU because combined RTUs feed all spaces together.
In my experience, if the RTUs deliver supply air to a common plenum or duct, they can be considered a single system for this prerequisite.
In Europe which parameters shall be considered to establish whether the site is non-attainment area for PM2.5?
I have found this:
The annual standard for PM2.5 is met whenever the 3 year average of the annual mean PM2.5 concentrations for designated monitoring sites in an area is less than or equal to 15.0 µg/m3. The 24 hour standard for PM2.5 is met whenever the 3 year average of the annual 98th percentile of values at designated monitoring sites in an area is less than or equal to 35 µg/m3.
In addition to air quality data, EPA guidance on the PM2.5 designations process also discusses other important factors, including emissions of pollutants that lead to PM2.5 formation, population, commuting patterns, and expected growth, that states should evaluate in order to determine whether a county is a likely contributor to the area’s air quality problem.
In a office building that is occupied by a private firm how shall be considered the toilets according to Table 6.4 of ASHRAE 62.1-2010?
Private, since the property is private?
Does it depend on the number of WCs? Or on the people who can use the toilets?
I have read better the notes in ASHRAE 62.1: I think that if in the room there is more than one WC the toilet shall be considered public.
Is the monitoring of mechanical ventilation always mandatory or do exceptions exist?
e.g, is it mandatory also if there is no recirculation (100% outdoor air)?
Projects do not have to have outdoor airflow monitoring devices installed to earn the prerequisite. The required measurements can be taken once during the performance period with the proper equipment.
Ben, you might be a little confused here. There is no performance period in the BD+C rating systems. Also, I believe that the monitoring equipment must be permanently installed. Taking measurements once (e.g. during air balancing) would not meet the intent of the credit.
Your right Adam, I was thinking of existing buildings rather than NC. Thanks for clarifying
Table 6.4 of ASHRAE 60.1-2010 states that parking garages that don't have walls that are at least 50% open to the outside shall have mechanical air extraction (exhaust ventilation). Can jet fans be used instead of a ducted extraction system (ductwork)?
Is your parking located in a basement or above grade? If your parking is above grade, what is the percentage open to the outside that you could have?
One more question: where are you planning to locate the jet fans?
If all your walls have no openings and you install jet fans, they will only move the air but they will not introduce outside air. It will not be accepted.
And if the project team will develope a simulation (e.g. CFD) that demonstrates that the ventilation rate is higher than the rate requested by Table 6.4 of ASHRAE 60.1-2010?
Does anyone know a definition for "single supply system". I've looked it up in ASHRAE 62.1 and ASHRAE's Manual and I wasn't able to find it.
Gustavo, can you provide more context to the question? I'm not sure about a single supply system.
It is not about a specific project. When doing a ventilation calculator I was wondering in which cases I should select this option.
I see. The ASHRAE 62.1 2007 user manual has a definition of sorts. See example 6-I if you have access to that.
Here's a shorthand for how the single zone system is defined there.
A (single) zone requires that each space within the zone have similar occupant and building outdoor air rates, similar occupant density, and similar zone primary airflow rates.
In one of our projects, the client is willing to have open spaces with high flexibility. In these open spaces, “boxes in the box” for copy rooms will be created. As the location of these boxes is flexible, the mech engineering cannot run any exhaust duct. He is suggesting the use of an active charcoal carbon filter with a fan to exhaust the air from the copy rooms to the open spaces. The contaminants would be filtered before the air is transfered and then exhausted through return ducts in the open spaces.
Has anyone had experience with this? We don’t find anything about this topic in ASHRAE 90.1.
Thanks for your help!
My suggestion would be that you select "low volume" printers as defined by LEED. This would make it so you don't need exhaust at all. Then as a bonus add the carbon filters anyway to improve air quality.
You could also get creative with a long common header exhaust duct that could be easily tapped into anywhere along a run.
I don't know how to interpret the following section of ASHRAE 62.1-2010:
"22.214.171.124. Double side openings. For spaces with operable openings on two opposite sides of the space, the maximum distance from the operable openings is 5H, where H is the ceiling height"
Option 1-the distance between the two walls is 5H, (i.e. the air travels a distance of 5H)
Option 2-the ventilated area is 5H from each opposite wall (i.e. the distance between the two walls can be a maximum of 10H)
Based on the language in 126.96.36.199 I think it means that the maximum distance between the two sides if 5H. I haven't seen this tested on a project though. Would be interested if others have a different opinion.
Thanks Ben, I agree with you. The project is begining construction phase, so I am afraid I will not have an outcome until late next year.
Can anyone provide me with a definition or point me towards how LEED v4 defines a dwelling unit? I have a dormitory project and am trying to interpret the Resi Only requirements for v4. As an example, if the residential units where the students have a common room and a bed room but no combustible equipment, it doesn't make sense to install CO monitors.
I am looking for the same answer but for hotel rooms - are these considered residential by LEED v.4?
See p. 8 of ASHRAE 90.1-2010 for the definition of dwelling unit and p. 15 for the definition of residential.
The dwelling units are a particular kind of residential space.
When we have a Naturally Ventilated Space, we can use an alarm to indicate that the openings are close.
Someone know if I can use an light alarm? or I must use an sound alarm?
Dear, I have one more question, please.
In ASHRAE 62.1-2010 section 6.4.1 there is an explantion about floor area to be ventilated. I didn't understand how calculate the area if there is only the number of distance. For example, to Single Side Opening the floor area to be ventilated would be 2H*(opening width)?
This is saying that only the space within a distance of 2H from the openings can be considered to be naturally ventilated. H is the floor to ceiling height. If you have an 8 ft. ceiling, and a wall with openings, only the space within 16' of those openings can be considered ventilated from those openings. Spaces deeper than that would not comply with the natural ventilation.
I'm developing a small project LEED v4. We don't want to use HVAC system, just natural ventilation.
But I am with big difficults to understand how I can provide a documantion demonstrating that natual ventilation is an effective strategy, following the flow chart of CIBSE AM10 (figure 2.8).
Does someone have a sample? Or any materials that can help me?
In the IEQp1 calculation form, provided by USGBC for using in LEED v4, in the Occupancy Category pull-down menu, there is nothing related to equipment rooms, non-occupied stores and similar spaces which belong to Non-regularly occupied spacesEnclosed space intended for human activities, excluding those spaces that are intended primarily for other purposes, such as storage rooms and equipment rooms, and that are only occupied occasionally and for short periods of time. Occupied spaces are further classified as regularly occupied or nonregularly occupied spaces based on the duration of the occupancy, individual or multioccupant based on the quantity of occupants, and densely or nondensely occupied spaces based on the concentration of occupants in the space.. The only one listed is Corridor. In the previous LEED version, in this spreadsheet there was an option "Other (specify)" where any non listed space could be entered. In this form such option do not exists. I've been asking via LEED Online - "Feedback" two days ago, but there's no answer and my question is:
How to enter such spaces in the IEQp1 spreadsheet calculator?
You're right, these spaces are still in the standard but not in the calculator. Weird! Please come back and let us know when you get a response from GBCIThe Green Building Certification Institute (GBCI) manages Leadership in Energy and Environmental Design (LEED) building certification and professional accreditation processes. It was established in 2008 with support from the U.S. Green Building Council (USGBC).--I'm curious to know if they were intentionally left out.
In the meantime, I think you have two options:
1. Include these spaces in the calculator as Corridors, since the required ventilation rates are the same, and provide a narrative explaining the additional space types that have been included this way.
2. Enter just the potentially critically zones into the calculator. Then you won't have to enter these ones, as they're not likely to be critical since they're non-occupied. To do this, you should select "No" under the "All zones are included in the VRP calculation" box at the top of the sheet for the system, and follow the instructions in the ASHRAE 62.1 User Manual for identifying critical zones.
That was the reply from GBCIThe Green Building Certification Institute (GBCI) manages Leadership in Energy and Environmental Design (LEED) building certification and professional accreditation processes. It was established in 2008 with support from the U.S. Green Building Council (USGBC).:
Thank you for your inquiry regarding IEQp - Minimum Indoor Air Quality Performance. I apologize for the delay in responding to your inquiry; we are currently experiencing a high volume of technical questions and appreciate your patience.
All occupiable spaces, regularly or non-regularly occupied, must be provided with ventilation in accordance with ASHRAE 62.1.
The definition of 'occupiable' is as follows: "an enclosed space intended for human activities, excluding those spaces that are intended primarily for other purposes, such as storage rooms and equipment rooms, and that are only occupied occasionally and for short periods of time."
Please note that if an exact occupancy is not listed, the most similar occupancy in terms of occupants and air contamination from materials, equipment, etc. should be selected.
Please also note that Data Centers should be classified as active storage or office for purposes of IEQp Minimum Indoor Air Quality Performance (ASHRAE 62.1-2010).
I hope that helps, but if you have any further questions or concerns about this inquiry, please feel free to respond directly to this email. For any new inquiries, please contact us at http://www.gbci.org/org-nav/contact/Contact-Us/Project-Certification-Que....
LEED Specialist, LEED AP O+M, PMP
Green Building Certification Institute
2101 L Street NW, Suite 500
Washington, DC 20037
There is no 62MZ calculator in version 4 LEED here:
Is there a new 62MZ calculator in version 4 LEED? or where to find it ?
Since the LEED 2009 calculator doesn't work any more, we need to find it to calculate multi-zone Minimum Indoor Air Quality in current project.
The Above Calculator is correct
1.is it possible to use this calculator instead of 62MZCalc in IEQ p1
Hi BEE and Sengathir,
You can use the new USGBC Minimum IAQIndoor air quality: The quality and attributes of indoor air affecting the health and comfort building occupants. IAQ encompasses available fresh air, contaminant levels, acoustics and noise levels, lighting quality, and other factors. Performance Calculator for both v2009 and v4 projects. As Dylan mentioned below, the old 62MZCalc, which is still available to download, can only be used for v2009 projects because it's based on ASHRAE 62.1-2007.
Can a mechanically conditioned space be naturally ventilated?
I mean, is this combination allowed by ASHRAE 62.1-2010 and ASHRAE 55-2010?
You shouldn't have a problem here as long as the ventilation meets the requirements of ASHRAE 62.1-2010 Section 6.4 (or is an approved engineered natural ventilation system), and the conditioning systems are able to meet ASHRAE 55. The two standards are really looking at separate performance components. I'd be sure to mark the correct option consistently on the credit forms and provide a section of the systems narrative explaining that the ventilation and conditioning are independent of each other just to make sure it's clear to the reviewer.
Will compliance with the ASHRAE 62.1-2013 standard be acceptable for LEED v4 projects (even though the credit currently references ASHRAE 62.1-2010)? Where would the USGBC include an interpretation or clarification like this on their website?
If you double-check the ventilation rates for each of the spaces in your project in both the 2010 and 2013 versions of the standard, and they're the same or more stringent in 62.1-2013, then you should be able to meet the requirements.
You can always check current interpretations on the Credit Library page (http://www.usgbc.org/credits), but there's not much there yet for v4! If the situation for your project ends up being tricky, I would use the Contact Us form on the USGBC website or even submit a CIRCredit Interpretation Ruling. Used by design team members experiencing difficulties in the application of a LEED prerequisite or credit to a project. Typically, difficulties arise when specific issues are not directly addressed by LEED information/guide for confirmation.
I've found another buggy in this calculator. In worksheet 'SZU', the column 'L' doesn't make the calculation to find 'Voz', always is empty. Did another user find this error?
Has this calculator been changed for use in NC-v4 EQp1 versus the one used in LEED 2009?
For new construction, are there any other prerequisites or credits that require the use of this tool in the submission process?
LEEDv4 uses the new ASHRAE ventilation code so the LEED 2009 calculator doesn't work any more.
You can download the new form here:
There are some issues with it still - hopefully the USGBC will be updating it in the near future. For example - adding/subtracting lines is buggy and nearly impossible even with macros enabled, it also doesn't do the +30% calc for you.
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