Receiver Tank Sizing and Installation Location

Serge Boutry spent 42 years building a compressed air empire. Two rounds of PE deals later, he was gone.

When Rubix announced the acquisition of Airflux on December 17, 2025, the press release ran four paragraphs. No deal value disclosed. Boutry's name was nowhere in it. Airflux is the largest independent compressed air company in France, 230 employees, roughly $52 million in revenue, split about evenly between equipment sales and maintenance. Gilles Verstraete stays on as CEO for two years. Rubix France CEO Alexandre Labasse said welcome. Verstraete said he looks forward to it. That was the whole press release.

Four paragraphs, and not a word about the founder.

I spent a lot of time on this, probably more than was warranted, trying to reconstruct the sequence of events between 1983 and the Rubix deal. What follows is what I could piece together from public records.

Boutry started Airflux in Lille, 148 rue de Marquillies. I found that address on Pappers, the French corporate registry platform. It's still listed as the company's registered address, which I thought was a nice touch. He was a salesman, compressors to small factories in northern France, and he did that for a very long time before the company became something bigger. Twenty-four branches eventually, from Lille down to the Mediterranean, 2,000 maintenance contracts, 80 field technicians with a two-hour on-site response commitment. $52 million in annual revenue by the end. Airflux was the only company in the French compressed air market that had achieved national coverage without being captive to a single OEM. That fact alone explains most of what happened next.

In 2014, Airflux opened its capital. Nord Capital Partenaires and CM-CIC Capital Finance came in, with a FIP fund under Turenne Capital taking a smaller piece. Boutry signed the Fusacq announcement as "Président" and talked about growth through acquisitions and international expansion (fusacq.com/buzz/airflux-ouvre-son-capital-a-nord-capital-partenaires-et-cm-cic-capital-finance-a85858_fr_). At that point the company had about 170 people, 22 branches, $37 million in revenue.

The PE dynamic matters for everything that comes after, so I'll lay it out. Nord Capital and CM-CIC are regional French PE funds. Once their money is in, Airflux is on a clock. The LPs behind those funds expect returns within seven to ten years, and the only way to deliver returns is to sell. Boutry would have understood this. Every founder who takes PE money understands this. The question is always what happens between the day the money arrives and the day the fund needs to exit. For Boutry, outside capital was the pragmatic move. Airflux had reached a size where funding acquisitions from internal cash flow alone was getting difficult. But PE capital comes with strings. Not visible ones, usually. Just a ticking fund life that sits in the background of every board meeting.

What happened was Chaumeca. In 2017, Airflux acquired a company called Chaumeca that manufactured dryers, filtration systems, and heat exchangers. This was the move that changed Airflux's business model. Before Chaumeca, Airflux was a distributor. It sold other manufacturers' machines and serviced them. The margin structure on that kind of business is fine but limited. You're essentially a reseller with a service contract attached. After Chaumeca, Airflux could sell the compressor, build the downstream treatment system from its own product line, install it, and service it with its own parts. The gross margin profile looks completely different when you control manufacturing. Chaumeca's general manager Rémy Rochard joined the leadership. Crédit Mutuel Equity's website (creditmutuel-equity.eu/fr/actualites/encarts/airflux.html) says Rochard was "le successeur du fondateur." Not potential successor, not leadership team addition. Successor.

On the same page, Boutry described Airflux as having evolved into "intégrateurs de solutions complètes et fournisseurs d'énergie." That transition took more than thirty years.

Then Boutry disappears from the public record. I checked LinkedIn, trade press archives, French business registries. No departure announcement, no interview, nothing. Rochard, the designated successor, is also absent from the 2025 Rubix acquisition. By December 2025, Verstraete was running the company, a name with essentially no public footprint before the deal. I don't have an explanation for this. Maybe there is no interesting explanation. But forty-two years and no public farewell from anyone is unusual. You'd expect at least a "we thank the founder for his decades of service" line in a press release somewhere. There isn't one. Not from Airflux, not from Crédit Mutuel Equity, not from Nord Capital. I went looking specifically and found nothing.

So: PE capital in 2014. Chaumeca acquisition in 2017 to add manufacturing and improve margins. CNG divestiture in 2018 to clean up the story. Founder out. Successor out. New CEO. Sale to Rubix. I've seen this in software, restaurant chains, vet clinics. It runs the same way every time regardless of industry.

Rubix.

In November 2025, Rubix closed the acquisition of ERIKS UK & Ireland (valves, seals, hoses, flow control), pushing UK and Ireland revenue past $890 million. Same month, minority equity went to Neuberger Berman Private Markets, Adams Street Partners, LGT Capital Partners, J. Safra Sarasin, and BlackRock (per adventinternational.com/news/advent-owned-rubix-completes-acquisition-of-eriks-uk-ireland-strengthening-the-uk-as-an-industrial-leader/). Same month, the CEO was swapped.

The acquisition plus the minority sale is exit prep. You push the top line up, then let institutional investors set a valuation by writing checks. These are not small funds making speculative bets. Neuberger Berman manages over $400 billion. BlackRock is BlackRock. These firms have entire teams whose job is to evaluate when a PE-held company is likely to have a liquidity event. They're pricing in an IPO or secondary sale within 18 to 36 months. The debt maturity in September 2028 creates a natural forcing function anyway. Either Advent refinances or Advent exits. The minority investors clearly expect the latter.

Rubix chairman Sleebus said Morkeberg "has managed the cost base and protected profitability with discipline and rigor, establishing resilience as a hallmark of our business."

Between 2021 and 2025, Rubix bought compressed air businesses in the UK (CompCare, system optimization and VSD retrofits), Spain (HEC, regional service out of Barcelona), Germany (HR Hafner, family-owned), and France (Airflux). Also Konrad Haluk in Germany, technically bearings, but based in Baden-Württemberg where Kaeser and Boge are headquartered. I was tempted to present these chronologically but dropped the idea because it would imply strategic choreography where there probably wasn't any. Griffiths and Knowles at CompCare were retirement-age. HEC was cobbled together from two smaller Spanish outfits in 2019. HR Hafner was a family succession situation. Nord Capital had been in Airflux for seven or eight years with LP pressure building every quarter. Each deal had its own story. The aggregate result is what matters: Rubix now has compressed air service coverage across four major European markets, stacked on top of 780-plus existing distribution locations (rubix.com/whats-new/).

Meanwhile, the OEMs are on their own buying spree.

Atlas Copco did 29 acquisitions in 2025. Air Compressor Works in Florida, 50 people, $18 million revenue, absorbed into Quincy's service division. Centroar in Brazil, 28 employees, mining and construction distribution. Zind Verfahrenstechnik in Germany, filter elements, no manufacturing. Ingersoll Rand put $168 million into an Italian deal. Parker Hannifin spent $9.25 billion on Filtration Group, which is really a different category of transaction entirely but tells you something about how aggressively the big industrials are moving to capture aftermarket revenue. The point is that both OEMs and PE platforms are going after the same shrinking pool of independent distributors. The motives are different. The consequences for the customers who depend on those distributors are different too, and I think that second part gets less attention than it should.

For forty years, customers trusted Airflux because Airflux owed no loyalty to any single OEM. If a GA VSD+ was the right machine for the application, they'd recommend it. If a Kaeser SFC made more sense, they'd recommend that. This is not how most compressed air distributors operate. Most are tied to one brand through distribution agreements that include volume commitments, co-op marketing budgets, and training certification requirements. Those agreements don't technically prohibit recommending a competitor's machine, but the economic incentives make it very unlikely. Airflux avoided those entanglements for four decades, and customers in industrial procurement, people who spend their careers buying equipment and know when a salesman is pushing a brand rather than solving a problem, noticed the difference.

Rubix isn't formally tied to a brand either, but Rubix procures more than $3.15 billion in goods annually. At that volume, supplier relationships are governed by volume rebates, back-end margin agreements, and preferred supplier tiers. Inside a company carrying $1.26 billion in net debt, the bonus structures reward margin, the margin comes from rebate tiers, and the rebates come from concentrating spend. Technical neutrality does not survive those incentive structures for very long. The people running Airflux branches are probably the same people who were there before the deal. But the purchasing decisions above them will increasingly reflect the economics of a $3 billion procurement platform, and those economics favor concentration over neutrality.

Boutry is somewhere in Lille. I looked for a public statement and came up empty.

The 80 Airflux technicians are in factory compressor rooms across France, adjusting pressure dewpoint settings and checking discharge-side oil carryover. The equity above them has turned over three times since 2014. None of the investors involved have ever had to take the discharge pressure on a GA 90 VSD+ from 8.5 bar down to 7.5 bar to save a customer $12,600 a year in electricity. That's not their job. Their job is the equity, and it's about to move again. Rubix's debt matures September 2028. Either Advent refinances, or the whole thing gets sold one more time.

When Morkeberg took over, he said Rubix's mission is "to keep the wheels of industry turning," and that his colleagues work hard at it every day. He's right. They do.