4" x 6-5/8" Direct Vent Cathedral Style Ceiling Support Box from Direct-TempUsed to support Direct-Temp pipe when installing in a cathedral or pitched ceiling. CCS comes with Support Collar and Decorative two-piece trim plate.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- rotation while securely locking the sections of pipe together with just a push of the tab.Features:Siliconozed fiberglass sealLockTab securityPipe rotates easily to align system componentsNo sealant requiredHigh efficiency performanceConnection Specifications:Joint/Connection Overlap: 1-5/8"Joint/Connection Type: Twist-Lock standard on all diametersMaterial Specifications:Outer Wall: Heavy duty galvanized steelInner Wall: 304 Stainless Steel