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Hey Ed, How Are Intermittent Loads Such as a Range Hood Accounted For Manual J?


In This Edition of “Hey Ed,” Ed Discusses How Intermittent Loads Such as a Range Hood Are Accounted For Manual J

Hey Ed, how are intermittent loads such as a range hood accounted for in Manual J? Intermittent loads are a very good topic as of late. I've heard a lot of people asking questions specifically about how do they include the ventilation from a flow hood. How do they include the ventilation air or the makeup air that is brought in to take care of the air that's getting ventilated out of the house. The specific word that you used is intermittent and manual J doesn't take it into account. It by definition is intermittent. The idea that we're going to be using that ventilation on a design day, chances are pretty slim and if we do have an intermittent load that is large enough to truly impact the gain or loss on the structure, that's a poignant conversation we have to have with the occupant to dissuade them from operating those loads when it's really hot or really cold out because we're not going to put additional capacity for our heating and cooling equipment to make up for the additional gain or loss that those intermittent loads can cause and that's the way I see it.

In This Edition of “Hey Ed,” Ed Discusses How Intermittent Loads Such as a Range Hood Are Accounted For Manual J

Ed Janowiak is the Manager of HVAC Design Education at ACCA.


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