McCann’s side are now just four points off the play-off places following their third consecutive home win.
Hull were deserved winners, but it required a neat header from Tom Eaves in first-half injury-time to get the hosts up and running.
Blues never looked like getting back into the game from there on in and conceded a second through’s Kamil Grosicki clever chip.
Hull-born striker Keane Lewis-Potter then added a late third with a drilled finish.
McCann said: “This performance will give us a lot of confidence going into three games in such a short space of time.
“We’ve another tough game against Nottingham Forest on Boxing Day and we’ll look to do the same again.
“I stand by what I’ve said – we’re at the halfway point and 33 points are not good enough.
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