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Ventless gas fireplace causing mantel to get too hot

Posted on 1/23/26 at 8:09 pm
Posted by cubsfan5150
NWA
Member since Nov 2007
18219 posts
Posted on 1/23/26 at 8:09 pm
New house (to me). I have a ventless fireplace and it’s causing the mantel to overheat and shrinking the seam caulk on wood. I’m afraid that if I continue to use it, the heat will cause the wood to warp.

Would a heat deflector fix the issue?

There is no fan.
This post was edited on 1/24/26 at 9:00 am
Posted by Ricardo
Member since Sep 2016
6321 posts
Posted on 1/23/26 at 9:13 pm to
I think your instincts are right. Ventless fireplaces make the area right above very hot. The heat deflector would probably be the easiest way to deal with the issue. Amazon has some pretty easy to install ones.
Posted by Spankum
Miss-sippi
Member since Jan 2007
61259 posts
Posted on 1/23/26 at 9:54 pm to
There is no easy answer to this. I’ve simply turned down the flame height on mine.


ETA: I think we’d be best off to create a gap between the mantle and the wall to let heat flow upwards.
This post was edited on 1/23/26 at 10:05 pm
Posted by cubsfan5150
NWA
Member since Nov 2007
18219 posts
Posted on 1/24/26 at 12:56 pm to
Did you add a heat deflector?
Posted by Spankum
Miss-sippi
Member since Jan 2007
61259 posts
Posted on 1/24/26 at 1:45 pm to
quote:

Did you add a heat deflector



No, I have not. Honestly never seen any kind of heat deflector for that application
Posted by 2 Jugs
Saint Amant
Member since Feb 2018
2326 posts
Posted on 1/24/26 at 5:52 pm to


There are minimum allowable distances that should be followed. Find the make/model of your fireplace and look up the manual.
Posted by TheDude854
Member since May 2019
394 posts
Posted on 1/25/26 at 9:27 am to
I put an airbar fan (basically a long, thin fan) on my mantle, right at the edge, with it blowing slightly down. That was the easiest and cheapest solution.

LINK
Posted by magicman534
The dirty dell
Member since May 2011
1833 posts
Posted on 1/25/26 at 9:34 am to
I think it’s common with those. I opted for a vented fireplace and sacrificed the heat when we built. My neighbor with a ventless ruins his TV above the fireplace every time he turns it on.
Posted by Ricardo
Member since Sep 2016
6321 posts
Posted on 1/25/26 at 9:40 am to
Neighbor should consider a heat deflector and/or fan to direct the heat away from the TV.
Posted by mamagreg
Member since Jul 2007
281 posts
Posted on 1/25/26 at 1:44 pm to
Heat deflector is your answer. I have one.
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