DuraTech Class A Wall Thimble 5" to 8"
Product Images
Product Details
Help & Documents
The DuraTech Class A Wall Thimble is used to allow safe passage of the DuraTech Class A chimney pipe when passing through a combustible wall. The Wall Thimble can adjust from 4" to 10" to accommodate varying wall thickness. The interior firestop is painted black with a galvanized exterior firestop. The Thimble fits perfectly between standard 16" on center studs.
The DuraTech Class A Chimney Pipe must extend a minimum of 6" past the interior firestop in the living space before using the Class A Finish Collar transitioning to black stove pipe.
Measurement Chart:
DuraTech Class A Wall Thimble 5" to 8"
Size | 5" | 6" | 7" | 8" |
A | 7.125" | 8.125" | 9.125" | 10.125" |
B | 14" | 14" | 16" | 16" |
C | 10.875" | 11.875" | 12.875" | 13.875" |
D | 13" | 14" | 15" | 16" |
Product Details:
The DuraTech Class A Wall Thimble is used to allow safe passage of the DuraTech Class A chimney pipe when passing through a combustible wall. The Wall Thimble can adjust from 4" to 10" to accommodate varying wall thickness. The interior firestop is painted black with a galvanized exterior firestop. The Thimble fits perfectly between standard 16" on center studs.
The DuraTech Class A Chimney Pipe must extend a minimum of 6" past the interior firestop in the living space before using the Class A Finish Collar transitioning to black stove pipe.
Measurement Chart:
DuraTech Class A Wall Thimble 5" to 8"
Size | 5" | 6" | 7" | 8" |
A | 7.125" | 8.125" | 9.125" | 10.125" |
B | 14" | 14" | 16" | 16" |
C | 10.875" | 11.875" | 12.875" | 13.875" |
D | 13" | 14" | 15" | 16" |
Help & Documents:
DIY Center
(AKA ‘The Rockford Files’)
From video tutorials to product walkthroughs, we have a variety of DIY resources just for you! Click the button below to view our entire library.

Our 316Ti flexible chimney liner and chimney liner components have passed the rigorous testing at the Underwriters Laboratories with best in class status and are UL Listed. So if you are looking for UL listed chimney liner sold directly to homeowners, then look no further than Rockford Chimney