Use Google to find several manufacturers. Get their technical data and guide specs, I've yet to see any manufacturer unwilling to share. Use one or more as a guide to create a generic spec for your use.
Fire dampers aren't motorized. they operate via a fusible link that closes the damper at a certain high temperature. Are you referring to smoke dampers?
Combo fire/smoke dampers are common. The smoke function works an actuator; the fire function melts a link that springs the dampers closed. There are a lot of misconceptions about these things.