I found the video about meeting the ventilation prerequisite very useful. I still have some questions that I hope can help other project teams:
1.Can we perform the VRP calculation including only the critical zone (meeting rooms) and disregarding other non-critical spaces?
2.If a system does not comply with ASHRAE 62.1-2010 because small VAV-boxes were installed and they do not provide the OA rates required by the calculator, does the project fall under the Case 2? Can the project comply with the prerequisite just measuring the outdoor air provided by the UMA and providing 10 cfm/person?
3.Is tenant ductwork a required documentation for certification? Many times, the false ceilings is inaccesible and the plans cannot be drawn up.
4.Natural ventilation is no longer accepted as the only means of ventilation. Does it also apply to bathrooms? Does a naturally ventilated bathroom need an exhaust fan?
Thank you!
Ben Stanley
Senior Sustainability ManagerWSP - Built Ecology
LEEDuser Expert
250 thumbs up
August 28, 2017 - 7:17 pm
Hi Gustavo,
I'm guessing you've solved for these issues but in case relevant for others, here are some thoughts.
1. Yes, the VRP calculation for a mulit-zone system can be completed by including only the potentially critical zones in the calculator. But, just make sure that you set up the calculator to account for the total floor area and occupants served by the whole system, not just the critical zone.
2. Yes, I believe you could still show compliance by providing at least 10 cfm per person at the system level.
3. There's leniency for this with existing building projects where full tenant HVAC plans are not required.
4. I don't think that operable windows alone would comply with a v4 project given the ASHRAE language for exhaust systems and natural ventilation. But, it would be a good idea to check with GBCI on the building's specific situation before making a conclusion.