Dear All,
We are evaluating the possibility of certifying a high-rise residential building project that will be built in Portugal.
According to the web-based reference guide, requirements for naturally ventilated spaces imply that the minimum outdoor air opening and space configuration shall be compliant with the natural ventilation procedure from ASHRAE Standard 62.1–2010.
The natural ventilation procedure from ASHRAE 62.1-2010 only allows the exclusion of mechanical ventilation systems if “natural ventilation openings that comply with the requirements of Section 6.4 are permanently open or have controls that prevent the openings from being closed during periods of expected occupancy “.
The questions are the following:
- Is it mandatory to comply with the natural openings control described in ASHRAE 62.1-2010, or only with the portion related with minimum outdoor air opening and space configuration ?
- If yes, is there any alternative for residential buildings? Note that typically these residential projects rely solely on manually operable windows for the purposes of ventilation (mechanical ventilation is limited to air exhaustion in toilets and kitchen hood).
Thanks,
Casey Cullen-Woods
Associate, SustainabilityThornton Tomasetti
12 thumbs up
April 12, 2021 - 8:03 pm
In my experience, LEED will not accept manual openings regardless of the project typology. Trickle vents would need to be added, or pursue via mechanical ventilation path, which can be exhast only. But you will need bathroom and kitchen exhaust.
Dave Hubka
Practice Leader - SustainabilityEUA
LEEDuser Expert
495 thumbs up
April 12, 2021 - 9:04 pm
LEED Interpretation 10416 states that ASHRAE 62.1-2013 can be used in lieu of ASHRAE 62.1-2010.
ASHRAE 62.1-2013 Addendum a, and the corresponding ASHRAE 62.2-2013 Addendum g place all dwelling units with non-transient occupants under the scope of ASHRAE 62.2-2013. Therefore, should the project team choose to apply this approach, all residential dwelling units may be documented as complying with ASHRAE 62.2-2013, and all other spaces may be documented as complying with ASHRAE 62.1-2013.
62.2 is more straightforward because it has no requirement about where the OA comes from.
Hope this helps!