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) "LEED Interpretation" "1897" "2007-09-05" "Homes, Mid-rise" "One of our builders cannot find an Energy Star rated bath exhaust fan that also has a one-hour fire rating (the fire rating is for the entire unit assembly of fan/housing/duct attachment). This is multifamily of course, where one-hour and two-hour fire separations between units and floors are a major code issue.\n\nUpdate: You can buy a fan that has a fire-rated damper built in, but none of the usual suspects (Panasonic, Broan, NuTone) make one that is Energy Star. You can still install an Energy Star fan but have to separately design/engineer/build fire-rated dampers inside the exhaust ducts. I\'m working with the builder and his HVAC/Plumbing team to figure out what the additional cost of this would have been. \n" "There are products by some of the major companies, including Panasonic and Broan, that are available with fire dampers and ENERGY STAR rated fans. This requirement should be achievable for multi-family. Any multi-family projects that make a good-faith effort to find this equipment and cannot should submit a CIR. Updated 10/1/13 for rating system applicability. " "None" "None" "X" "LEED Interpretation" "1912" "2007-10-25" "Homes, Mid-rise" "This is a large multi-family project. This project is planning to meet IEQ 4.1 with continuous bathroom exhaust. However, the project team will not create exhaust pentrations for each kitchen because of the exceptional cost. They plan to use recirculating kitchen hoods, and they can plan to increase the bathroom exhaust to a higher air flow (i.e. 45 CFM higher). The kitchen is located within 10 feet of the air handler, which should increase air exchange in the kitchen. Can this approach pass for IEQ prerequisite 5.1?" "Recirculating kitchen fans do not help to meet this prerequisite because they do not provide ventilation air or remove humidity or pollutants from the home.\n\nIt is possible to meet the requirements without ductwork to the exterior walls. This can be achieved by providing ductwork through the attic/roof, which can also facilitate combining all the exhaust ductwork (for all units, including bathroom and kitchen), and using multi-port exhaust fan systems for cost savings. Such systems only require proper radiant dampers to meet fire codes if the ducts are designed properly and are small, thick metal ducts. Updated 10/1/13 for rating system applicability. " "None" "None" "LEED Interpretation" "2278" "2008-08-01" "Homes, Mid-rise" "In some cases the kitchen exhaust rate is hard or impossible to test because the flow hood is an awkward shape. How should this be handled?" "There are a few options in a case like this:\n1) don\'t give the project team credit - this is not a prerequisite;\n2) test the exhaust from the exterior of the home, if it\'s accessible;\n3) jury-rig the test using cardboard to block off most of the range hood and create a calibrated opening that can be used to test flow rate w/ a balometer. Many raters will have a custom box made from ductboard. \n\nThere are also some more sophisticated testing tools that could be used, but they are expensive and it\'s unusual for a rater to have the equipment and/or be familiar with how to use it. Updated 10/1/13 for rating system applicability. " "None" "None" "LEED Interpretation" "2322" "2008-09-17" "Homes, Mid-rise" "If the kitchen exhaust rate is impossible to test because the hood is an awkward shape, is it possible for a project team to earn 1/2 point in EQ 5.3 for testing and verifying the flow rate in the bathrooms?" "No, this credit can only be earned if all of the kitchen exhaust and bathroom exhaust systems are tested and verified, as per the credit requirements. There is no partial credit. Updated 10/1/13 for rating system applicability. " "None" "None" "LEED Interpretation" "2413" "2008-11-19" "Homes, Mid-rise" "It is clear that EQ 5.1 includes half-baths, however what about EQ 5.2? For example, if the project is trying to earn credits for EQ5.2 and installs occupancy-sensored fans in each of the bathrooms, can the fan in the half-bath only be manual, or does it also have to follow the requirements of EQ5.2?\n\nAs I mentioned before, because ""half-bath"" is not specifically called out in EQ 5.2, and because there is no significant humidity source in a half-bath (and EQ 5.2 deals primarily with humidity and moisture), I would guess that the example above would still meet EQ 5.2." "EQ 5.2 can be earned if the requirements are met for all bathrooms with showers and/or bathtubs. Updated 10/1/13 for rating system applicability. " "None" "None" "X" "LEED Interpretation" "2525" "2009-03-18" "Mid-rise" "Can the local exhaust requirement be met with operable windows in the bathrooms? ASHRAE Std. 62.1 includes an exemption based on operable window area." "No. As per the Mid-rise Pilot Guidelines, mechanical exhaust is required in all cooking areas and bathrooms Updated 10/1/13 for rating system applicability." "None" "None" "LEED Interpretation" "2596" "2009-08-24" "Homes, Mid-rise" "According to ASHRAE Std. 62.2, the kitchen ventilation requirement can be met with continuous ventilation that meets 5 kitchen ACH. In some small units, the kitchen is open to a much larger room. In this case, how do we define the kitchen ACH?" "ASHRAE 62.2 is unclear on how to define the kitchen area, so Green Raters and project teams are granted discretion when defining the kitchen area. Updated 10/1/13 for rating system applicability. " "None" "None" "LEED Interpretation" "2695" "2009-10-31" "Homes, Mid-rise" "The specific requirements for EQ 5.2 seem unclear. Please clarify for a) if the occupancy sensor must be located in a specific place, and for a), b) and c) how long the fan must operate after the system has been activated." "Occupancy sensors should be placed in a location such that the exhaust fan is triggered when the toilet or shower are used. Applicable Internationally.\n\nWhen triggered, bathroom exhaust fans should operate for at least 20 minutes. Project teams are advised to set the time to be longer for small fans or large bathrooms, but it\'s not part of the credit requirement.\n Updated 10/1/13 for rating system applicability. " "None" "None" "X" "LEED Interpretation" "5351" "2009-08-25" "Homes, Mid-rise" "EQ 5.1 requires kitchen exhaust that ""meets the requirements of Section 5 of ASHRAE Std. 62.2-2007."" It also requires that ""exhaust air to the outdoors..."" ASHRAE Std. 62.2, Section 5.1 includes an exception for alternative ventilation design methods if approved by a licensed design professional, and several projects have pushed back that this grants them the discretion to install recirculating kitchen exhaust fans. \n\nPlease clarify: is a recirculating kitchen exhaust fan ever an acceptable strategy for satisfying EQ 5.1, if signed-off by an engineer? " "EQ 5.1 cannot be satisfied with a recirculating fan. The exception in ASHRAE Std. 62.2, Section 5 allows alternative methods for achieving the required exhaust rates; a recirculating fan provides no exhaust and cannot achieve the flow rates in EQ 5. Updated 10/1/13 for rating system applicability. " "None" "None" "LEED Interpretation" "5400" "2009-08-03" "Homes, Mid-rise" "Table 5.1 for intermittent local ventilation exhaust airflow rates includes the following requirement: 100 CFM, with the note ""vented range hood required if fan flow rate is less than 5 kitchen ACH."" How should we interpret this - how are ACH calculated for intermittent systems? Does this mean that a project could have intermittent ventilation in the kitchen that is not a range hood?" "As written, the Standard (and LEED for Homes) requires local exhaust in the kitchen that meets the following: \n Updated 10/1/13 for rating system applicability. " "None" "None"