Hello, I am trying to come up with a way to automaticaly control the air intake on my wood stove. Right now everything is manual. I have a thermostat set to run a fan at the intake to stoke the fire when the room temp gets too low. I want to add a damper that opens when the fan kicks in. I have a door lock solenoid from an old dodge van. I have wired it up and it will open the damper. A spring will keep the damper closed when the fan cuts out. My question is, is there a better way to accomplish this? My setup is running off a 12 volt battery charged by a solar panel, so efficiency is important. I am worried that the solenoid will waste too much power holding the damper open. I know it is probably not rated for continuous use, but it was free. Is there a bolt on intake damper/fan available for sale? I have been searching but maybe using the wrong words.