[Highland Park] pellet stoves

Hi Neighbors, Wondering if any of you who have pellet stoves would be willing to talk to us about how you have them vented out of your house. We have a pellet stove, but apparently the manufacturer's instructions do not mesh well with the City of Pgh. codes. Making it impossible to have it installed . We do not have a working chimney so we can not go that route. Please let me know if you have any experience with this. Thanks for your help! Erin and Rad