What is the difference between roof windows, sky windows and skylights?

Not a whole lot. Some manufacturers use the term “roof window” to describe a relatively large skylight placed low enough that you can see out to the landscape. I guess if you can see only sky, it’s a skylight, but if you can see sky and land, you call it a roof window. Roof windows are generally big enough to qualify as means of egress in case of a fire. That’s seldom...
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