Previously Harmon told Scout that he planned a visit tour to the East Coast in hopes of securing offers.
"In May, I'm going to go and see the East Coast schools that told me if I come and visit, they will offer me as long as my measurable are what they say they are. Those schools are Duke, Rutgers and Old Dominion."
Apparently the measureables checked out, which lead to a Duke offer this week. Following that, Harmon committed.
At 6-foot-4 and 270 pounds, Harmon helped Central Catholic to a big year in Ohio.
"Not only did we win the Division II State Championship, but I played well. I played a lot more confidently this year which was great."
As with most of the schools who offered, Harmon projects to play center at the collegiate level instead of guard. In addition to the above listed offers, he had inters from Kentucky, Indiana, Missouri, and Penn State.
Harmon has yet to be evaluated by the Scout.com staff for star rating purposes. He becomes the fourth offensive lineman to commit to Duke from 2014.