Speaking before the vote, Nick de Bois, the MP for Enfield said: "I hope the board are of no doubt that a vast swathe of my constituents are not in favour of this proposal."
Tim Peachey, the interim Chief Executive at Barnet & Chase Farm NHS Trust said: "Changes will put health economy ahead in London."
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Paramedics were on standby outside the police cordon as armed officers stood by the property.
A team of researchers has taken samples from the ten busiest London Underground lines to work out which are the dirtiest.
The action comes on top of an emergency timetable which has seen hundreds of trains a day being axed.