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Mall entrance infiltration modeling for LEED compliance

asked 2023-03-14 15:30:39 -0500

jferamo89's avatar

updated 2023-03-17 09:03:05 -0500

Hi there,

I am currently carrying out an energy modeling for a shopping mall. There are several entrances with vestibules. I was wondering if it would be required to account for the infiltration through the entrances, since it will have a high traffic. Have any of you faced this issue before? do you think this is required for LEED minimum energy performance credit compliance (ASRAE 90.1)? Sadly I could not find much information about it, and whether is necessary to account for this for not.


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@jferamo89 this question seems very similar to your other post. Can I close the other post if it is a duplicate?

Aaron Boranian's avatar Aaron Boranian  ( 2023-03-17 09:45:15 -0500 )edit

Hi Aaron. Certainly. Close the other post, please. Thanks.

jferamo89's avatar jferamo89  ( 2023-03-17 10:08:49 -0500 )edit

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answered 2023-03-14 21:45:12 -0500

Keigo's avatar

updated 2023-03-17 09:07:50 -0500

  • LEEDv4: ASHRAE90.1-2010 Appendix G. How to calculate infiltration is not clearly described.
  • LEEDv4.1: ASHRAE90.1-2016 Appendix G. How to caululate infiltration is clearly described as shown below.

    image description

    I75Pa is 2.03L/s·m2. (FYI, it is changed to 3.0L/s·m2 in ASHRAE90.1-2019.)

    image description

Normally, I calculate IAGW for both LEEDv4 and LEED v4.1.

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Hi Keigo,

Thanks for the input. However, I was referring to the entrance infiltration through the doors. I assume this is normally not considered, and acceptable for LEED compliance. Is this correct?


jferamo89's avatar jferamo89  ( 2023-03-16 09:19:04 -0500 )edit

The above methodology takes into account all the infiltration from envelope including windows and doors. And you are talking about LEED compliance. Then, you need to follow it.

If I may add one thing, below is an excerpt from ASHRAE90.1-2016 User's Manual:

Credit may not be gained for reduced infiltration in the proposed building without substantiation by physical testing of the constructed building. When the leakage of the constructed building has been measured following ASTM E779, the standard leakage rate used for the proposed building model may be reduced using the measured value.

Keigo's avatar Keigo  ( 2023-03-16 11:36:14 -0500 )edit

answered 2023-03-14 18:05:51 -0500

obuchely's avatar


The infiltration must be the same in the baseline and proposed model.

Try to calculate a sensible infiltration air flow and use the same for both cases.

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Asked: 2023-03-14 15:30:39 -0500

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Last updated: Mar 17