The Club is in a much better place now from where we were a year ago because it was dark times.Harlee Dean
A third game in a week seemed to take its toll on both sides, with neither fashioning many clear-cut openings.
But despite the failure to break down the Bees, the point meant that Blues remain in seventh spot in the table.
Asked if he thought the heavy fixture schedule of late had had an impact, the central defender admitted: "You could say that.
"I think it was probably a game that people expected us to win but you can't really under-estimate Brentford. They are a good footballing team in this division.
"I think the first-half showed that, we were a bit slow out of the blocks which we were a little bit disappointed with.
"But in the second-half we had the majority of the game but nothing really clear-cut and the margins probably went against us - little details.
"I think we could have definitely had a penalty in the second-half but it's a positive result, another clean sheet, it's unbeaten.
"I think if you don't win those games then you have to make sure you don't lose them. It's one that we take."
Blues' clean sheet against Brentford was their third successive one, and that's something that Dean is rightly proud of.
"As I said if you can't win it, don't get beat," he said.
"Clean sheets are important in this league. I think that's our ninth of the season, three in a row is nice to have.
"It was just one of those games today, a little bit scrappy, which we wanted to make it.
“We weren't as good as we have been, but last year we would have probably lost that game if we were not at our best.
"We did alright, it's another point on the board and another little unbeaten run carries on."
Saturday's match was Blues' final one of the 2018 calendar year, and reflecting on the progress that has been made over the last 12 months, Dean feels their has been a massive improvement.
"The Club is in a much better place now from where we were a year ago because it was dark times," he added.
"It's a lot more enjoyable, the stadium is a lot fuller, there's a lot more support and atmosphere.
"The fans are enjoying it and the players are enjoying it.
"We just want it to continue and carry on getting better."