first mounting means disposed on {HEAD ~ said trap} for mounting {TAIL ~ said trap} on a vertical wall of said furnace; and 
first mounting means disposed on { HEAD ~ said trap } for mounting { TAIL ~ said trap } on a vertical wall of said furnace ; and
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH