4" X 24" BH VENT PIPE, RATED OPERATING TEMP:3" AND 4" 300-480 F, 5" TO 16" 300-480 F, MIN CLEARANCE ENCLOSED:HORIZONTAL SIDE-8", TOP-12", BOTTOM-4", VERTICAL 4", GAS VENT TYPE:BH, DIMS:4"W X 24"l, WEIGHT:1 LBS, ORIGIN:UNKNOWN, **ALTERNATE PART NUMBER:158105**