Retail-NC-v4 EQc1: Enhanced indoor air quality strategies

  • Several strategies available under one credit

    This credit presents teams with several different strategies for protecting indoor air quality. Teams can pursue Option 1 or Option 2 independently (for one point each), or pursue both options for a total of two points. 

    The 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. strategies outlined in the LEED Reference Guide can be achieved with varying degrees of difficulty (and cost), depending on your project design and other sustainability and performance goals. Be sure to review and understand the requirements of each strategy within the context of your building before committing to a given option.

    What’s New in LEED v4

    • Portions of the following LEED 2009 credits have been combined into a single credit: EQc1: Outdoor Air Delivery Monitoring, EQc2: Increased Ventilation, and EQc5: Indoor Chemical and Pollutant Source Control.
    • USGBC added additional options for naturally ventilated spaces.
    • There is now additional guidance for warehouses, distribution centers, data centers, health care facilities, and residential projects.
    • USGBC no longer requires calculating the minimum pressure differential to meet the interior cross-contamination prevention requirements. However, the exhaust rates from the ventilation standard in EQp1: Minimum Indoor Air Quality Performance ventilation standard must be used. LEED now requires a minimum exhaust rate of 0.5 cubic feet per minute per square foot (2.54 liters per second per square meter), for spaces that do not have a requirement from this ventilation standard.
    • Teams have the option to use filtration media that meet CEN Standard EN 779–2002, Particulate Air Filters for General Ventilation, Determination of the Filtration Performance.

    FAQs

    Do I have to achieve Option 1 if I want to pursue Option 2?

    No, Option 1 and Option 2 are separate. You can pursue either option without earning the other, or both if you like. Achieving both options is worth 2 points total. To earn exemplary performanceIn LEED, certain credits have established thresholds beyond basic credit achievement. Meeting these thresholds can earn additional points through Innovation in Design (ID) or Innovation in Operations (IO) points. As a general rule of thumb, ID credits for exemplary performance are awarded for doubling the credit requirements and/or achieving the next incremental percentage threshold. However, this rule varies on a case by case basis, so check the credit requirements., you must earn Option 1 and earn Option 2 and incorporate an additional Option 2 strategy. 

    Has the pressure differential requirement of at least 5 pascals for LEED 2009 EQc5: Indoor and Chemical Source Pollutant Control been eliminated from the requirement of this credit?

    Yes, the pressure differential has been eliminated in LEED v4. See above.

  • EQ Credit 1: Enhanced indoor air quality strategies

    Intent

    To promote occupants’ comfort, well-being, and productivity by improving indoor air quality.

    Requirements

    Option 1. Enhanced IAQ strategies (1 point)

    Comply with the following requirements, as applicable.

    Mechanically ventilated spaces:

    A. entryway systems;

    B. interior cross-contamination prevention; and

    C. filtration.




    Naturally ventilated spaces:

    A. entryway systems; and

    D. natural ventilation design calculations.



    Mixed-mode systems:

    A. entryway systems;

    B. interior cross-contamination prevention;

    C. filtration;

    D. natural ventilation design calculations; and

    E. mixed-mode design calculations.




    A. Entryway systems

    Install permanent entryway systems at least 10 feet (3 meters) long in the primary direction of travel to capture dirt and particulates entering the building at regularly used exterior entrances. Acceptable entryway systems include permanently installed grates, grilles, slotted systems that allow for cleaning underneath, rollout mats, and any other materials manufactured as entryway systems with equivalent or better performance. Maintain all on a weekly basis.

    B. Interior cross-contamination prevention

    Sufficiently exhaust each space where hazardous gases or chemicals may be present or used (e.g., garages, housekeeping and laundry areas, copying and printing rooms), using the exhaust rates determined in EQ Prerequisite Minimum Indoor Air Quality Performance or a minimum of 0.50 cfm per square foot (2.54 l/s per square meter), to create negative pressure with respect to adjacent spaces when the doors to the room are closed. For each of these spaces, provide self-closing doors and deck-to-deck partitions or a hard-lidLow-impact development: an approach to managing rainwater runoff that emphasizes on-site natural features to protect water quality, by replicating the natural land cover hydrologic regime of watersheds, and addressing runoff close to its source. Examples include better site design principles (e.g., minimizing land disturbance, preserving vegetation, minimizing impervious cover), and design practices (e.g., rain gardens, vegetated swales and buffers, permeable pavement, rainwater harvesting, soil amendments). These are engineered practices that may require specialized design assistance. ceiling.

    C. Filtration

    Each ventilation system that supplies outdoor air to 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. must have particle filters or air-cleaning devices that meet one of the following filtration media requirements:

    • minimum efficiency reporting value (MERVMinimum Efficiency Reporting Value (MERV) rating is an American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) measurement scale which rates the effectiveness of air filters. ) of 13 or higher, in accordance with ASHRAE Standard 52.2–2007; or
    • Class F7 or higher as defined by CEN Standard EN 779–2002, Particulate Air Filters for General Ventilation, Determination of the Filtration Performance.
  • [East Asia ACP: Filtration Media]
  • Replace all air filtration media after completion of construction and before occupancy.

    D. Natural ventilation design calculations

    Demonstrate that the system design for occupied spaces employs the appropriate strategies in Chartered Institution of Building Services Engineers (CIBSE) Applications Manual AM10, March 2005, Natural Ventilation in Non-Domestic Buildings, Section 2.4. [Latin America ACP: Engineered Natural Ventilation Systems]

    E. Mixed-mode design calculations

    Demonstrate that the system design for occupied spaces complies with CIBSE Applications Manual 13–2000, Mixed Mode Ventilation.

    Option 2. Additional enhanced IAQ strategies (1 point)

    Comply with the following requirements, as applicable.

    Mechanically ventilated spaces (select one):

    A. exterior contamination prevention;

    B. increased ventilation;

    C. carbon dioxide monitoring; or

    D. additional source control and monitoring.



    Naturally ventilated spaces (select one):

    A. exterior contamination prevention;

    D. additional source control and monitoring; or

    E. natural ventilation room by room calculations.


    Mixed-mode systems (select one):

    A. exterior contamination prevention;

    B. increased ventilation;

    D. additional source control and monitoring; or

    E. natural ventilation room-by-room calculations.



    A. Exterior contamination prevention

    Design the project to minimize and control the entry of pollutants into the building. Ensure through the results of computational fluid dynamics modeling, Gaussian dispersion analyses, wind tunnel modeling, or tracer gas modeling that outdoor air contaminant concentrations at outdoor air intakes are below the thresholds listed in Table 1 (or local equivalent for projects outside the U.S., whichever is more stringent).

    Table 1. Maximum concentrations of pollutants at outdoor air intakes

    Pollutants Maximum concentration Standard
    Those regulated by National Ambient Air Quality Standards (NAAQS) Allowable annual average

    OR

    8-hour or 24-hour average where an annual standard does not exist

    OR

    Rolling 3-month average



    National Ambient Air Quality StandardsThe level of pollutants prescribed by regulations that are not to be exceeded during a given time in a defined area. (EPA) (NAAQS)



    B. Increased ventilation

    Increase breathing zoneThe breathing zone is the region within an occupied space between 3 and 6 feet above the floor and more than 2 feet from walls or fixed air-conditioning equipment. (AHSRAE 62.1–2007) outdoor air ventilation rates to all occupied spaces by at least 30% above the minimum rates as determined in EQ Prerequisite Minimum Indoor Air Quality Performance.

    C. Carbon dioxide monitoring

    Monitor CO2 concentrations within all densely occupied spacesAreas with a design occupant density of 25 people or more per 1,000 square feet (40 square feet or less per person).. CO2 monitors must be between 3 and 6 feet (900 and 1 800 millimeters) above the floor. CO2 monitors must have an audible or visual indicator or alert the building automation system if the sensed CO2 concentration exceeds the setpoint by more than 10%. Calculate appropriate CO2 setpointsSetpoints are normal operating ranges for building systems and indoor environmental quality. When the building systems are outside of their normal operating range, action is taken by the building operator or automation system. using methods in ASHRAE 62.1–2010, Appendix C.

    D. Additional source control and monitoring

    For spaces where air contaminants are likely, evaluate potential sources of additional air contaminants besides CO2. Develop and implement a materials-handling plan to reduce the likelihood of contaminant release. Install monitoring systems with sensors designed to detect the specific contaminants. An alarm must indicate any unusual or unsafe conditions.

    E. Natural ventilation room-by-room calculations

    Follow CIBSE AM10, Section 4, Design Calculations, to predict that room-by-room airflows will provide effective natural ventilation. [Latin America ACP: Engineered Natural Ventilation Systems]

    Alternative Compliance Paths (ACPs)

    East Asia ACP: Filtration Media

    Projects in East Asia may use filtration media classified as high efficiency (高中效过滤器) or higher as defined by Chinese standard GB/T 14295-2008 (空气过滤器).

    Latin America ACP: Engineered Natural Ventilation Systems

    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).

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Jul 26 2017
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