(You might be looking for Smoke Vents.)

Skylight system with acrylic domes and aluminum framing.

Barrel Vaulted flat end skylight on a built-up roof.

Useful Links:

1. General: See this great introductory article on skylights. Available on the website of the US Department of Energy.

2. General: "Why I Hate, Hate, Hate Skylights" by Erik North. Food for thought. Heat loss and condensation issues. Available on the Green Building Advisor site.

3. Technical: For an in-depth introductory technical article about skylights, see this page at the Whole Building Design Guide site, which is maintained by the National Institute of Building Sciences. It's a very good page.

4. Technical: "Performance of Tubular Daylighting Devices" is a detailed article from 2014 available on the National Research Council Canada website. Well worth reading if you're interested in or considering these energy-saving devices.

5. TechnicalSee this Product Data Sheet for the technical characteristics of prefabricated skylights at the Bristolite websiteThis is only an example and other products and brands may be different.

6. Technical: Another article worth taking a look at is "Daylighting" on the Whole Building Design Guide site. The article covers much more than skylights, but it helps you understand skylights better by putting them into a broader context.

7. ManufacturersSee here for a list of skylight manufacturers.