I dont know what brand of zero clearance fireplace you are considering but most home improvement stores sell Temco brand. Ive never put one in a mobile home but have several in the house I am building in Missouri. We have a metal roof on the house. We used double wall chimney all the way to the top and outside.
You will have to buy a seperate kit that gives you the ceiling thimble and all the extra flashing and capping for the roof. Id just be careful there is no flammable
material anywhere near the chimneys and you should be okay. If you go to this
page you can see some pics of the installation of one of the fireplaces in our house: http://www.geocities.com/missourijournal/MISSOURIJOURNAL16.html
Good luck.
You will have to buy a seperate kit that gives you the ceiling thimble and all the extra flashing and capping for the roof. Id just be careful there is no flammable
material anywhere near the chimneys and you should be okay. If you go to this
page you can see some pics of the installation of one of the fireplaces in our house: http://www.geocities.com/missourijournal/MISSOURIJOURNAL16.html
Good luck.