Cold air issues from the bottom of direct vent fireplace can usually be eliminated by checking underneath.
Direct vent fireplace cold air.
Direct vent fireplaces are a type of vented gas fireplace that does not use air from inside the home to operate.
The sealed combustion chamber is always seperate from the box you frame in.
Plug the holes with rokwool insulation or high temp caulk.
The bad news is if the fireplace installer does not take care to insulate the fireplace install correctly it will let in a great deal of cold air when dormant.
That absolute cheapist worst designed direct vent fireplaces should not have cold air coming out of them.
A direct vent fireplace does a great job pulling 100 of its combustion air from the outside and dumping the exhaust back outside as well.
If you have not had the original installer over to look at the problem i would try that first.
The chimney cap buying guide and the chimney pipe buying guide will help you find out what your options are and how.
We have several resources to help.
Fireplace air vent installation can sometimes be difficult to figure out which air intake vent kit is right for you.
Where the controls are located there are usually gas line knockouts holes on the left and right side.
This should stop the problem.
They can be vented both horizontally and vertically.
They feature a firebox sealed with tempered or ceramic glass and use a dual purpose vent that both vents exhaust to and pulls combustion air from the outdoors.
The good news is that direct vent gas fireplaces unlike vented gas logs generate heat efficiently when running.
If the damper is not closed after use they can also let cold air into the house.
Traditional fireplaces with dampers wide open pull the warm air out of your house when in use.