I have a wood stove in the basement which has backdraft issues when not in use. It shares a chimney with an upstairs fireplace. Behind the wood stove are two ash cleanouts, one for the upstairs fireplace and one for the stove. The cleanout door is about 4ft below where the stovepipe enters the wall/chimney. So my question is, can I install a top-mount damper and run the chain down to the ash cleanout? I can then open/close the damper through the ash cleanout door and solve my backdraft issues when the stove is not in use?