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