Tri-Dim Hardy was born from the partnership of Tri-Dim Filter Corporation and Hardy Filtration, as both companies were acquir ... ed by MANN+HUMMEL in 2018 and 2019, respectively. Tri-Dim Hardy is a provider of a full-line of HVAC filtration products and services, dust collectors, compressed air treatment systems and residential filters. When Tri-Dim Hardy joined the MANN+HUMMEL Group in August 2019, we became a valuable member of one of the largest filtration companies in the world. read more