Rensa Filtration, an Audax Private Equity portfolio company and vertically integrated manufacturer and distributor of consumable, mission-critical air filtration solutions, announced that it recently acquired Air Filters Northwest and AFNW® Services (“AFNW”).

AFNW was founded more than 30 years ago in Portland, Oregon and has since established air filter distribution and service teams in several locations across the U.S. Air Filters Northwest and AFNW® Services provide high quality air filtration solutions for applications including healthcare, semiconductor fabs, and data centers.

Brandon Ost, CEO and Founder of Rensa Filtration, noted, "We’re excited to partner with Doug and Charlene Potter who founded the business together in 1993. Doug has been an innovator and forward-thinking business leader in the air filtration industry and he and his team helped develop and commercialize innovative solutions including InfiniPleat® air filters which use Rensa’s fully synthetic IREMA-Filter media and proprietary pleating technologies. AFNW’s service teams provide comprehensive on-site support that ranges from filter installation and testing to used filter recycling. We look forward to partnering with the AFNW management team, employees, and customers during this next phase of growth for the business.”

The acquisition marks the tenth air filtration acquisition since Audax invested in Rensa in 2022. “In the last year, the Rensa team has organized its North American business into two divisions: Rensa Filter Manufacturing, which produces air filters for OEMs, distributors and major end-users, and Rensa Filter Distribution, which has filter distribution centers supported by sales and service teams in multiple locations across the U.S.,” noted Joe Rogers, a partner at Audax Private Equity.

“Rensa continues to try to enhance its value proposition for clients through expanding its air filter service offerings, growing its local distribution capabilities and presence, and through leveraging its vertically integrated supply chain, which includes proprietary filter media, filter manufacturing, and filter installation and replacement services.”

About Rensa Filtration

Rensa is a leading designer, manufacturer and distributor of highly engineered, consumable air filtration solutions focused on helping protect people and systems in critical environments and applications. Rensa offers a wide range of standard and customized air filtration products that provide best-in-class filtration performance and energy savings in education, healthcare and high-tech manufacturing facilities. Rensa also offers specialized air filtration solutions for data centers and activated carbon filters for the removal of odors and molecular contamination in museums, airports and healthcare facilities. For more information, visit rensafiltration.com or follow us on LinkedIn.

About Audax Private Equity:

Headquartered in Boston, with offices in San Francisco, New York, London and Hong Kong, Audax Private Equity is a leading private equity platform focused on investing across the North American middle market. Our objective is to accelerate value creation through our Buy & Build strategy and the Audax Value Agenda™, a holistic framework that seeks to create, enable, and protect value across every stage of the investment lifecycle. As of January 2026, Audax Private Equity had approximately $19.5 billion of assets under management and, since inception in 1999, has invested in more than 180 platforms and more than 1,400 add-on acquisitions. For more information, visit www.audaxprivateequity.com or follow us on LinkedIn.

View source version on businesswire.com: https://www.businesswire.com/news/home/20260406862801/en/