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″ |
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