Minneapolis, MN, September, 2015 – Spell Capital Partners, a leading lower middle market private equity firm, announces the sale of its portfolio company, Engineered Products Co., to Donaldson Company, Inc. (NYSE: DCI), a global leader in engine filtration. Engineered Products Co. was the first investment in Spell Capital Partners Fund and through its widely recognized Filter Minder® brand is a leading designer and manufacturer of indicators, gauges, switches and sensors for engine air filtration and liquid filtration systems. Spell Capital invested in Engineered Products Co. in 2012 and worked with the management team to grow revenue, increase profitability and expand the company’s product offerings. The transaction closed on August 31, 2015. Financial terms were not disclosed.