I don' t think heat is an issue. these would replace the 2 I have there now. I also have the more common 14" clear one in mine but the old metal ones have a spring loaded pull chain thingy that hangs in your face.... I would look at a crank or slide bar? Guessing now that there's not much demand for them. just thought it would be nice to have a better mechanism that the chain or even a solar
powered exhaust fan.
They sound like they would be great for light blocking... but...
wouldn't they get a bit warm up there?