Fireplace Question

[u/Old-Discipline-2802]

My fireplace was having some issues, so I called a guy to check it out, and used a carbon monoxide detector and found that it was showing like 15-20 ppm coming from the fireplace. He said I should change the fireplace, but that’s just crazy expensive.

I wanted some help on like roughly how much would changing a wall inserted natural gas fireplace cost? I’m genuinely clueless and online shows no prices.

Also, is 15-20ppm dangerous? Like online says dangerous is 100-200 ppm, but the guy said it should say zero. I wanted to be safe but I don’t want to take unnecessary precautions.

Any help?

[u/Gouche]

If it's emitting that much then find the leak.