We are working on a natural ventilated CS office building. The entire building is going to be natural ventilated with no AC. The bathrooms are the only areas with an air extraction system, but we haven´t been able to understand if this system belongs to a mechanical ventilation system?
The air extraction system simply take out the air from the bathrooms and transports it to the outside of the building.
Could anyone help us with this?
Thank You!
Luis Miguel Diazgranados
Green Factory125 thumbs up
November 23, 2011 - 6:28 pm
Regarding my question above, maybe some details will shed some light in our inquiry:
As I stated above, the only mechanical ventilation in the project will be an exhaust ventilation system in the bathrooms. The LEED online form's Table "Ventilation Rate Procedure" doesn't seem to be designed for exhaust systems, since it asks for information such as Rp, Ra, Ez and Ev that is not included in ASHRAE's Table 6-4 (the table to be followed by air exhaust systems, according to ASHRAE 62.1 paragraph 6.2.8).
The form doesn't seem to include a table specifically for exhaust systems. So, any idea on how should we proceed? Should we exclude this exhaust system from our calculations? Should we mark the Special Circumstances Box and upload our own table, using Table 6-4's information?
Once again, thanks for your help.
Dylan Connelly
Mechanical EngineerIntegral Group
LEEDuser Expert
472 thumbs up
January 10, 2012 - 3:19 pm
Luis,
You do not need to include the exhaust system in your calculations for this pre-req. Having an exhaust system does not count as Mechanical Ventilation for LEED purposes.
As a naturally ventilated building you must comply with ASHRAE Standard 62.1-2007, paragraph 5.1.
Luis Miguel Diazgranados
Green Factory125 thumbs up
January 11, 2012 - 11:43 am
Thanks for the answer Dylan, it's been really helpful.