Is Sterling Fan Ceiling Radiation Damper compatible with this bath fan? If so is that considered a fire damper?

Yes! The Sterling Ceiling Radiation Damper can be used with a bath fan like the ACiQ ANP80, provided the size and installation match the fan and the ceiling assembly requirements. However, it is not considered a fire damper, but rather a ceiling radiation damper designed to limit heat transfer and maintain a fire-rated ceiling assembly, not to stop flames like a true fire damper. If you have more questions, feel free to give us a call!