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