901935 Nordyne interior roof jack extension 10-inch

Interior roof jack extension lengthens roof jack connection to furnace by 10". Extension not adjustable but roof jack is. Interior roof jack extension lengthens roof jack connection to furnace by 10". Extension not adjustable but roof jack is. Inside pipe measures 5" diameter and outside pipe measure 8.25" diameter. Measurements taken on the non-crimped end. Crimped ends will be slightly smaller.Measurements taken on the non-crimped end. Crimped ends will be slightly smaller. Entire interior extension must be exposed below the ceiling. Connections cannot be inside attics.