Barnet opened up a 15-point lead at the top of the Conference after an easy win over play-off chasing Crawley.
Dean Sinclair headed in Ian Hendon's cross after just 20 seconds and tested Town keeper Phil Smith with a volley.
Liam Hatch nodded Ben Strevens' cross back across goal to beat Smith and double the Bees advantage before Simon Wormull was dismissed for a bad foul.
Dwane Lee blasted Hatch's nod down from Simon Clist's corner into the roof of the net to seal a comfortable victory.
Barnet: Tynan, Hendon, King, Charles, Clist, Strevens, Sinclair (Lopez 86), Lee, Graham, Grazioli (Roache 82), Hatch.
Subs Not Used: Gore, McBean, Elmes.
Goals: Sinclair 1, Hatch 49, Lee 71.
Crawley Town: Smith, Judge (Armstrong 64), Burton, Simpemba, Hankin, Robinson, Kember, Wormull, Jenkins, Tait (Marney 65), MacDonald (Healy 72).
Subs Not Used: Little, Opinel.
Sent Off: Wormull (51).
Booked: Simpemba, Judge, Jenkins, Robinson.
Att: 2,302
Ref: D Birkett (Lincolnshire).