Madison Industries-backed Filtration Group, a manufacturer of air filters, completed the acquisition of Columbus Industries, a company design, manufacture and distribute air filters. Financial terms were not disclosed. "Columbus Industries is globally recognized as the gold standard within indoor air filtration; the company's vertically integrated manufacturing capabilities and its best-in-class proprietary in-house media provide faster lead times, greater flexibility and higher quality to its market-leading customers and channel partners. We are thrilled to welcome Columbus to the Filtration Group family," Tim McCarty, Filtration Group CEO.