No fusible link, but that is a great idea, and I will probably add it. No damper, as right next to the fan is the 1/4 inch plywood for the attic stairs, which may also be considered a weak point for fire. I see the Solar Guys have a similar setup (above), I would suggest going with them.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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