Dahl was signed by the Falcons off the San Francisco practice squad to the active roster on October 9, 2007, after the Falcons placed Wayne Gandy on injured reserve.

In 2008, he became a full-time starter for the Falcons at right guard.
He established a name for himself as one of the league's toughest, nastiest players.
He also helped pave the way for the Falcons' Pro Bowl running back Michael Turner and the Falcons' run game, which was second in the league in rushing.
Dahl excelled in pass blocking as well, as he and the rest of the Falcons offensive line only allowed 17 sacks (a franchise record) of 2008 AP Offensive Rookie of the Year quarterback Matt Ryan.

During the Falcons–49ers match-up on October 11, 2009, Dahl and San Francisco head coach Mike Singletary got into a spat on the field where Singletary told Dahl, "You better be happy you didn't play back in my day!
 If I could see you on the field!..."
to which Dahl replied, "Suit up, then!"
Dahl was signed by the Falcons off the San Francisco practice squad to the active roster on October 9, 2007, after the Falcons placed Wayne Gandy on injured reserve.
In 2008, he became a full-time starter for the Falcons at right guard. He established a name for himself as one of the league's toughest, nastiest players. He also helped pave the way for the Falcons' Pro Bowl running back Michael Turner and the Falcons' run game, which was second in the league in rushing. Dahl excelled in pass blocking as well, as he and the rest of the Falcons offensive line only allowed 17 sacks (a franchise record) of 2008 AP Offensive Rookie of the Year quarterback Matt Ryan.
During the Falcons–49ers match-up on October 11, 2009, Dahl and San Francisco head coach Mike Singletary got into a spat on the field where Singletary told Dahl, "You better be happy you didn't play back in my day!  If I could see you on the field!..." to which Dahl replied, "Suit up, then!"
Harvey Dahl