Metalbest 5Dt-Fs Direct-Temp 5 X 8 Direct Vent Firestop Spacer - Galvanized

5 x 8 Direct Vent Firestop Spacer from Direct-Temp This spacer is required when penetrating combustible materials with the direct vent system. Refer to the installation instructions for specific requirements. Direct-Temp system features stainless steel inner and heavy duty galvanized steel outer walls. Heavy duty centering brackets keep inner pipe centered and chamfered edges allow for easy slide-together assembly. The free-floating inner liner allows the pipe to expand and contract under high temperature without creating gaps or stress points. The LockTab(r) is a unique design that allows for 360 degrees rotation while securely locking the sections of pipe together with just a push of the tab. Features: Siliconozed fiberglass seal LockTab security Pipe rotates easily to align system components No sealant required 14 x 14 Base 8.125 Hole Diameter 10.125 between opposite tabs High efficiency performanceConnection Specifications: Joint/Connection Overlap: 1-5/8 Joint/Connection Type: Twist-Lock standard on all diametersMaterial Specifications: Outer Wall: Heavy duty galvanized steel Inner Wall: 304 Stainless Steel