# PDD Practice Exam Form 1 Question 12 - Sun Space vs. Isolated Gain

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**Created:** [February 13, 2024, 12:30am UTC](https://community.blackspectacles.com/t/pdd-practice-exam-form-1-question-12-sun-space-vs-isolated-gain/5627 "2024-02-13T00:30:48Z")\
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**Author:** ![J.Jian](https://blackspectacles.com/uploads/images/7.png) [@J.Jian](https://community.blackspectacles.com/u/J.Jian)\
**Post date:** [February 13, 2024, 12:30am UTC](https://community.blackspectacles.com/t/pdd-practice-exam-form-1-question-12-sun-space-vs-isolated-gain/5627/1 "2024-02-13T00:30:48Z")

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An architect is designing a passive solar building. This particular design uses a nearby south-facing slope. The slope will have a specially designed collector where air will be warmed by the sun and then rise to serve as the heat for the building. Cooler air will simultaneously be pulled from a chamber below the floor, creating a convection loop.

What is this type of passive solar system called?  
The correct answer is Isolated Gain.  
What is the difference between sun space vs isolated gain? I googled the definitions and learned that sun space is a form of isolated gain. Can anyone help to clarify?