DuraTech Class A Wall Thimble 5" to 8"

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"