Sealing drafty gas fireplace (crosspost)
I also posted this on the FP forum earlier but I thought it might be a good idea to ask here as well.
I have a gas fireplace that has a pretty significant breeze coming from the bottom vent area when the north wind blows.
Here's the problem (click to enlarge):
This does not lead directly outdoors. The breeze seems to come through the direct-vent chimney, around the back of the fireplace and out this hole. What can I safely use to seal around this gas pipe under my fireplace? Thanks!