I’m about to line and insulate my masonry chimney flue. I am setting up for a Blaze King Boxer 24, and have followed the criteria in its manual.
We have opened the flue at the correct height and will be using a two-part tee with a separate snout.
In a test fitting, the snout protrudes a long distance out of the chimney breast, which is not yet finished as the house is undergoing renovation.
What’s the best way to trim a tee snout to length? Should it be trimmed before or after installation? If after installation, how can it be trimmed without beating up the finished wall?
I had been assuming that my best time to trim the snout is after I finish the wall over the chimney breast, but now I am wondering if I’m wrong. The flue I’m using is off center in the chimney breast (which enables me to meet rooftop clearances required by code,) so I will be adding 1/2” Durock cement board behind the stove per Blaze King specs and then shingling with slate shingles. If I trim after slating, I’m worried that I won’t be able to trim close enough to the slate without breaking it.
Is it best to estimate the finished length and trim it before installation? If I trim it before, I will need to add 1/2” for the Durock plus whatever the thickness of the slate shingles will be.
This is the adapter I am looking at. I am thinking it must slide into the snout of the tee, but I don’t know that for a fact.
www.rockfordchimneysupply.com
Thanks in advance for your advice.
Maud
We have opened the flue at the correct height and will be using a two-part tee with a separate snout.
![firesidechimneysupply.com](/talk/proxy.php?image=https%3A%2F%2Ffiresidechimneysupply.com%2Fmedia%2Fcatalog%2Fproduct%2Fcache%2F77b36c6a77fffd801c31b38bc061b4d5%2Fr%2Fe%2Frevised_tee_1-11-24_1.jpg&hash=cbb3964b940164fa2987d5a4621813d8&return_error=1)
In a test fitting, the snout protrudes a long distance out of the chimney breast, which is not yet finished as the house is undergoing renovation.
What’s the best way to trim a tee snout to length? Should it be trimmed before or after installation? If after installation, how can it be trimmed without beating up the finished wall?
I had been assuming that my best time to trim the snout is after I finish the wall over the chimney breast, but now I am wondering if I’m wrong. The flue I’m using is off center in the chimney breast (which enables me to meet rooftop clearances required by code,) so I will be adding 1/2” Durock cement board behind the stove per Blaze King specs and then shingling with slate shingles. If I trim after slating, I’m worried that I won’t be able to trim close enough to the slate without breaking it.
Is it best to estimate the finished length and trim it before installation? If I trim it before, I will need to add 1/2” for the Durock plus whatever the thickness of the slate shingles will be.
This is the adapter I am looking at. I am thinking it must slide into the snout of the tee, but I don’t know that for a fact.
![www.rockfordchimneysupply.com](/talk/proxy.php?image=https%3A%2F%2Fwww.rockfordchimneysupply.com%2Fcdn%2Fshop%2Fproducts%2Fmasonry-adapter-sideways.jpg%3Fv%3D1688810750&hash=c2b22b6c0b72adb1413791905f71fa83&return_error=1)
Double Wall Pipe Masonry Adapter - Connect Stove Pipe to Flex Liner - Rockford Chimney
The double wall black stove pipe masonry adapter mates to a double wall stove pipe or elbow to the tee snout of a flexible chimney liner. Ships free!
![www.rockfordchimneysupply.com](/talk/proxy.php?image=https%3A%2F%2Fwww.rockfordchimneysupply.com%2Fcdn%2Fshop%2Ffiles%2Frockford-chimney-favicon.jpg%3Fcrop%3Dcenter%26height%3D32%26v%3D1685641119%26width%3D32&hash=7e473e01fa1898e5d06fc099b5b23264&return_error=1)
Thanks in advance for your advice.
Maud