Pittsburgh-based contracting firm Limbach Holdings Inc. on Thursday announced a definitive agreement to acquire Dunbar Mechanical Inc. for $20.2 million. Dunbar is a privately-owned provider of mechanical construction services based in Toledo, Ohio. Limbach (Nasdaq: LMB) and Dunbar have side-by-side experience working together since 2016. Subject to customary closing conditions, the deal is expected to close within 60 days. The $20.2 million transaction is comprised of $4 million of Limbach common...