Selkirk-Metalbest Metalbest Direct-Temp 4" x 6-5/8" Direct Vent Ceiling Support

4" x 6-5/8" Direct Vent Ceiling Support from Direct-TempUsed as support on vertical applications when penetrating flat ceilings or floors.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 d...