can I cut down a ceiling support box

[Notsure04]

New to this website and wondering if I can cut a ceiling support box that is too tall so that it will fit. Im installing a wood stove in my sunroom and it has a low slope roof total thickness of the ceiling is about 6 inches. So would I be able to cut a support box down to a shorter size so it dosent stick out so much hoping to cut it down to 9 inches so it only sticks out about 3 inches. Hope you can help thanks

 

[bholler]

New to this website and wondering if I can cut a ceiling support box that is to tall so that it will fit. Im installing a wood stove in my sunroom and it has a low slope roof total thickness of the ceiling is about 6 inches. So would I be able to cut a support box down to a shorter size so it dosent stick out so much hoping to cut it down to 9 inches so it only sticks out about 3 inches. Hope you can help thanks

Refer to the manufacturers instructions. If it doesn't say call them. I work with ventis and it is allowed with their system. But you need to check for the one you are using

 

[Notsure04]

Actually just did some more research and I did find out that I can cut my support box down. Thank you for the help