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NC-2009 IEQp1:Minimum IAQ Performance

Enclosed space and 62.1 compliance

I am confused with the definition of the enclosed space. For instance, will a factory with the large area of a solid roof and metal grill (and from outdoor can flow in and out freely) count as an enclose space and need to comply with 62.1. Another case is an atrium with roof but have no door and have some openning under the roof (the air can flow freely). Will it count as an enclose space and need to comply with 62.1. Thanks

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Rudolph Carneiro
HVAC consultant
Optimized Systems
LEEDuser Basic Member
19 thumbs up

Wed, 10/02/2013 - 15:58

Definition of enclosed space from ASHRAE 90.1: a volume substantially surrounded by solid surfaces such as walls, floors, roofs, and openable devices such as doors and operable windows. Check out the difnition of "occupiable space" in ASHRAE 62.1 also.

Wed, 10/02/2013 - 16:36

Thanks The term "substantially" seems subjective. For instance, if we have a solid roof and have 1 wall but three sides are open. What will fit this definition? is it enclosed or not? What if the rest are attached with metal grills and the air can easily pass around? Will it be enclosed?
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Rudolph Carneiro
HVAC consultant
Optimized Systems
LEEDuser Basic Member
19 thumbs up

Wed, 10/02/2013 - 16:59

Well, if you have only 1 wall and a solid roof, then you would definitely comply with the natural ventilation requirements of section 5.1 in 62.1. The same applies to the factory. The free area of the grills are what would be used to caculate the 4% free area requirement of section 5.1. If you do have a substantially surrounded space with ventilation grills on the roof, and you cannot comply with the openings requirements of section 5.1, then maybe you might be able to comply utilizing stack effect calculations.

Mon, 10/07/2013 - 13:16

If that is the case, what about the hotel balcony (outdoor) , open terrace, open court. I think these are not enclosed space. it seems strange if i have to apply 62.1 section 5.1 to these space. Am I right?
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Rudolph Carneiro
HVAC consultant
Optimized Systems
LEEDuser Basic Member
19 thumbs up

Mon, 10/07/2013 - 13:42

Yes. If they are obviously not substantially surrounded, I would not consider them.

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