Hi yes you can get a longer vent pipe for this most local home improvement stores sell this.
If yours doesn't have one you will need to contact a fireplace store for this local to you.
The pipe they all may have will be the correct dimensions except for that you will likely need to cut the length to fit your particular application.
In any case, I will stick with you until this is complete.
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Hi yes they should be able to help, but usually even many hardware stores should be abl to get that pipe for you;)
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