

Close the outside-air duct when the fire is out. This register drops inline into the 4" fresh air intake pipe of an Osburn wood fireplace and puts an airtight damper on a wall knob: open while the fireplace runs, closed when it is cold so no outdoor air leaks into an airtight house. The kit is the damper pipe with cable and mechanism, the wall plate, indicator and knob, and the screws; the insulated intake pipe and clamps are not included. Fits the Everest III's 4" intake on either side, and the Stratford II. $280.