Construction
Flue: .016" Type 430 Stainless Steel
Casing: .019" Galvalume Steel or .022" Satin Coated (painted black)
Paint: Forrest “Stove Bright” flat black.
Seam: Interior and exterior seams are laser welded.

Sizes
4" interior X 6 5/8" exterior
5" interior X 8" exterior
* charts refer to inner diameter

These trims are typically used as decorative covers when installing a wall thimble in a gas stove application.  On vertical installations they can serve as firestops when installed from below.  They can also serve as a firestop on horizontal installations that don't require a wall thimble (i.e. a fully non-combustible wall).  The Trim Ring (TR) is larger and round and the Trim Plate (TP) is smaller and square.  Available in black only. 
All EXCELDirect trims include a rubberized O-ring to seal the gap between the trim and vent.