Vogelzang Anti-Backdraft Damper - Model# AD-8 Reviewhttp://tinyurl.com/pedw9ru Vogelzang Anti-Backdraft Damper - Model# AD-8 Aids in starting the stove to get the draft going faster. Installation is fast and easyPrevents back draft from returning to the furnace plenumHighly recommended for proper furnace installationSpring activated for proper functioningEasy installation
