Hi,
I have a question about something in the flu of a gas fireplace. This looks like insulation to me which would be bad, but it may be something else? This gas fireplace does not have s way to close the flu. Is this something else and if so is this a common practice for gas fire places that have a flu that doesn't close?
![insulation in gas flue insulation in gas flue](https://www.hearth.com/talk/data/attachments/320/320974-aa7b39c2519b3cdfadafd7a3ed11af5e.jpg)
I have a question about something in the flu of a gas fireplace. This looks like insulation to me which would be bad, but it may be something else? This gas fireplace does not have s way to close the flu. Is this something else and if so is this a common practice for gas fire places that have a flu that doesn't close?
![insulation in gas flue insulation in gas flue](https://www.hearth.com/talk/data/attachments/320/320974-aa7b39c2519b3cdfadafd7a3ed11af5e.jpg)