We are working on a residential project that is being certified v4 BD+C (not midrise). There is continuous exhaust in the bathroom of each dwelling unit, and the exhaust cfm is high enough to meet the requirements of 62.1-2010 Table 6-4 for the bathroom and kitchen combined. Does the kitchen also need to have an exhaust hood, or is it sufficient to exhaust it through the bathroom? This seems to meet the intent of 62.1-2010 since the two spaces are part of the same zone, classified as "Dwelling Unit" per Table 6.1.
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Dionisio Franca
DirectorWoonerf Inc.
30 thumbs up
January 9, 2018 - 8:43 pm
Vicky,
You may get a review comment asking you to consider the kitchen as a kitchenette or commercial kitchen. Do you have a non-exhausting type hood in order to clean the food smell over the cooker? I wonder why there is no exhaust in the kitchen.
Sherman Aronson
Sr. AssociateBLT Architects
4 thumbs up
January 22, 2020 - 5:39 pm
Larissa Oaks - similar issue - June 18, 2018 - 5:20 pm
LEED v4 considers kitchen exhaust in residences as an important (and required) design element to allow occupants to remove contaminants and extra moisture generated from cooking activities, directly to the outdoors. This is a requirement in both the BD+C (per ASHRAE 62.1) and Homes (per ASHRAE 62.2) rating systems. Note that recirculating hoods do not meet the ASHRAE definition of exhaust.
Transferring kitchen contaminants through the living space to exhaust via the toilet/dryer exhaust is non-compliant with the standard because the class 2 kitchen exhaust air (see Section 5.16.1 and Table 6-4 regarding residential kitchen exhaust air classification in ASHRAE 62.1-2010) in most cases must pass through other living space (class 1) before finding its way to the bathroom to be exhausted. It additionally would be challenging to claim that the required volume of air is transferred directly from the kitchen (as opposed other spaces within the unit) unless there existed a situation where the bath was immediately adjacent to the kitchen, and the path of makeup air for the bathroom exhaust pulled exclusively through the kitchen. That would be a case where the class 2 air transferred to a class 2 space.
David Posada
Integrated Design & LEED SpecialistSERA Architects
LEEDuser Expert
1976 thumbs up
January 22, 2020 - 7:53 pm
I agree with Sherman.
For reference in some jurisdictions we have seen LEED Homes Midrise projects (following ASHRAE 62.2) be approved when there is a recirculating range hood over the kitchen stove and ducted exhaust in the kitchen area itself in addition to the bathroom exhaust, but haven't ever seen exhaust from only the bathroom.