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NC-2009 IEQp1:Minimum IAQ Performance

Partially Occupied Warehouse

I am working on a project that has a 45,000 SF unconditioned warehouse and utilizes natural ventilation. A small portion of the warehouse is used for educational purposes, the majority is used for storage. Currently, the only operable windows are along the perimeter walls, however the majority of the space is not within 25 feet of these operable windows. The ceiling is 40 feet high. How would we comply with natural ventilation requirements in the central spaces? If operable skylights are added, the floor space would still be outside the 25 foot range. Is there an exemption for the portion of the warehouse that is used only for storage?

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Mon, 07/06/2015 - 22:07

Hi Annalise! I am afraid that if you are not able to provide natural ventilation meeting ASHRAE or CIBSE requirements you will need to implement mechanical ventilation. I would say you have to options: 1.I would try first with ASHRAE 62.1-2010, which gives you the requirements to design a space with cross ventilation (unlike ASHRAE 62.1-2007) 2.If you are not able to provide natural ventilation following (1) I would try with mixed-mode ventilation. As far as I know ASHRAE hasn't defined the requirements for this system yet, but it has been widely accepted and very efficient. According to ASHRAE 62.1 you need to provide 0 L/s•person PLUS 0.3 L/s•m2.

Mon, 07/06/2015 - 23:15

Hi Gustavo, Thank you for the response. I just came across a LEED Intepretation, #10144 that states "if the distance from windows or openings is more than 25 feet, is there an exhaust air fan located at the furthest distance from the windows that is inducing the outdoor air to flow through the space; is that exhaust fan flow equivalent to the outside airflow that would be required for the space if the Ventilation Rate Procedure were used?" If utilizing exhaust fans in spaces that are greater than 25 feet from operable windows, is there a requirement for the distribution of exhaust fans throughout the space that doesn't comply?

Wed, 07/08/2015 - 18:39

It depends on your floor plan. You will need to ensure that there are left no zones without ventilation (either rooms or corners in your warehouse).

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