Rensa Filtration, a manufacturer and distributor of air filtration solutions and a portfolio company of Audax Private Equity, announced that it has acquired Air Filters Northwest and AFNW Services, expanding its footprint in distribution and service capabilities across the United States.
Founded more than 30 years ago and headquartered in Portland, Oregon, AFNW provides air filter distribution and service solutions for critical environments, including healthcare facilities, semiconductor manufacturing, and data centers. The company has built a multi-location presence with service teams offering installation, testing, and recycling support.
The acquisition represents Rensa’s tenth add-on transaction since Audax invested in the company in 2022. Over the past year, Rensa has organized its North American operations into two divisions: manufacturing and distribution, strengthening its vertically integrated model spanning filter media, production, and on-site services.
Rensa said the deal enhances its ability to expand local distribution, improve service offerings, and leverage its proprietary filtration technologies, including synthetic media and advanced pleating systems.
Audax highlighted that the acquisition aligns with its Buy & Build strategy, focused on scaling middle-market platforms through targeted acquisitions and operational integration.
KEY QUOTES
“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.”
Brandon Ost, CEO And Founder Of Rensa Filtration
“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. 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.”
Joe Rogers, Partner At Audax Private Equity

