{HEAD ~ The couplings} are mounted in the floor of the structure and are constructed and secured in {TAIL ~ the floor} such as to prevent fire and smoke from passing around the couplings between the couplings and the floor 
{ HEAD ~ The couplings } are mounted in the floor of the structure and are constructed and secured in { TAIL ~ the floor } such as to prevent fire and smoke from passing around the couplings between the couplings and the floor
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH REL OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH