{HEAD ~ A blower} with {TAIL ~ a filter} is mounted on the outside of the desk and blows clean air into the compartment 
with
{ HEAD ~ A blower } with { TAIL ~ a filter } is mounted on the outside of the desk and blows clean air into the compartment
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH