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Who makes rear-door heat exchangers for AI data centers

A heat exchanger mounted on the rear door of a server rack that cools exhaust air with chilled water or refrigerant before it leaves the rack, without cooling the chips directly.

The rear-door heat exchanger is an air-assist approach rather than a direct-to-chip one: it sits behind a rack of otherwise air-cooled servers and pulls heat out of the exhaust air using a chilled-water or refrigerant coil before that air re-enters the room, rather than cooling the die directly the way a cold plate does. It is typically deployed where a facility wants to raise the density it can support without redesigning every server for direct liquid cooling, or as a supplement in racks that mix liquid-cooled accelerators with air-cooled networking and storage. Because it works at the rack-exhaust level rather than the die level, it has a lower cooling ceiling than a direct-to-chip loop and is generally positioned as a bridge or hybrid option rather than the primary cooling path for the highest-density AI racks. Investors should watch it as a hybrid-density play: demand depends on how much of the installed base stays on air or mixed cooling rather than converting fully to direct-to-chip.

Appears at:Enterprise / small coloLarge colo / hyperscale building· cooling:hybrid — Used as a hybrid or bridging measure in mixed air/liquid racks or facilities not built for full direct-to-chip cooling; less common at the highest-density AI campus and GW-class builds, which favor direct-to-chip.

Companies on this part (8)

CompanyRoleOwnershipTickerPrice1dConfidenceNote
LegrandmanufacturerpublicLR.PA124 EUR+0.4%disclosed · source
Motivair · unit of Schneider ElectricmanufacturersubsidiarySU.PA*inferred
nVentmanufacturerpublicNVT125 USD-2.4%inferred
VertivmanufacturerpublicVRT194 USD-0.2%inferred
Coolcentricmanufacturerprivatedisclosed · source
Huaweimanufacturerprivateinferred
Rittalmanufacturerprivateinferred
Stulzmanufacturerprivateinferred

Who competes here

The same table read the other way: every company above competes for rear-door heat exchangers sockets. Confidence tags matter — an inferred placement is a lead, not a confirmed rivalry.

Seen in real machines

rear-door heat exchangers is named in 3 of the rack teardowns and supercomputer breakdowns on this site. Each line below is a piece of that machine. The companies shown are the ones named on that line, not necessarily the maker of this part.

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CoolIT Rear Door Heat Exchangers (RDHx)
CoolIT Systems — applications and cost tradeoffs of rear-door heat exchangers
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Questions about rear-door heat exchangers

What are rear-door heat exchangers?
A heat exchanger mounted on the rear door of a server rack that cools exhaust air with chilled water or refrigerant before it leaves the rack, without cooling the chips directly.
Which companies make rear-door heat exchangers for AI data centers?
This catalog lists 8 companies on Rear-door heat exchangers, 4 of them with listed equity: Legrand, Motivair, nVent, Vertiv, Coolcentric, Huawei, Rittal, Stulz.
How reliable are these rear-door heat exchangers supplier placements?
The 8 placements on this part break down as 2 disclosed, 6 inferred. "disclosed" means the company or a filing says so; "reported" comes from trade press or a reference-design list; "inferred" is a taxonomy lead with no citation yet.

Sources: placements without a source URL come from the taxonomy seed and are tagged accordingly. How this data is built.· Markdown · JSON