Seal between vent pipe and wall thimble?

[sc204]

First post here. I am installing a direct vent 0 clearance fireplace by Empire. It uses 8 / 5 duravent venting. I am using the reccomended wall thimble through a wood framed wall. My question is do you seal the junction of the outer pipe and the thible opening? I can see a little light penetration from the inside.
Thanks for helping.

 

[DAKSY]

You can use tape gasket to seal this area. It will prevent cold air penetration through that gap. Simply wrap the vent pipe where it enters the wall thimble.

 

[sc204]

Can I get away with a high temp silicone sealer? Can't imagine the outer pipe getting that hot.

 

[DAKSY]

Yes. RTV will work. We used tape gasket because it’s less expensive. Your call.