Snapshot

Server racks and enclosures are the standardized steel frames (19-inch or 21-inch wide, typically 42U tall) that physically hold every server, switch, and storage device inside a data center. The global data center rack and enclosure market was roughly $4.6 billion in 2024 and is forecast to reach $9–10.5 billion by 2030–2034, growing at an est. 8–13% CAGR. AI GPU racks command est. 2–3x the average selling price of standard racks because they require structural reinforcement (a single NVIDIA GB200 NVL72 rack weighs over 1,300 kg), integrated liquid cooling manifolds, and higher power delivery. The US alone has roughly 7 GW of data center capacity under construction as of mid-2025, with plans to double total installed capacity by 2030.

The product & how money is made

A server rack is a steel frame, typically 42U tall (one "U" or rack unit = 1.75 inches), that slides into a data center row. Servers, switches, and storage mount on standardized rails inside. The simplest product is an open-frame 2-post rack (retail ~$230). An enclosed 42U cabinet with doors, cable management, and airflow optimization retails for $1,000–$1,250. Air-conditioned or liquid-cooling-integrated racks reach $3,000+ at retail. A fully outfitted AI rack with GPU servers, networking, cooling manifolds, and power distribution installed can cost $3.9 million — most of that cost is the compute hardware, not the rack itself.

Manufacturers sell the physical enclosure (sheet metal, welding, powder coating) and accessories: side panels, blanking panels, cable trays, PDU mounting brackets, and casters. The higher-margin opportunity is integrated rack solutions — pre-configured cabinets with built-in power distribution, cooling plumbing, and monitoring sensors, sold as turnkey units to hyperscalers and colocation operators. Services (installation, commissioning, maintenance) add recurring revenue.

Differentiation comes from custom engineering for specific OEM requirements, speed of delivery, and integration with higher-value thermal and power systems.

Demand

Contracted / visible

• Vertiv backlog: $15.0 billion at end of FY2025, up 109% YoY. Covers all Vertiv products (power, thermal, racks, services), not racks alone. Vertiv does not disclose rack-specific backlog. (Vertiv Q4 2025 earnings release)
• nVent backlog: $2.6 billion as of Q1 2026, up from ~$2.3B at end of FY2025, roughly triple the prior year. Majority extends into 2027. Covers enclosures, liquid cooling, and electrical connections — not rack-only. (nVent Q1 2026 earnings)
• ~7 GW of US data center capacity under construction as of mid-2025. Each MW of IT load requires est. 10–25 racks depending on density (legacy 10–15 kW/rack = ~70–100 racks per MW; AI at 50–100 kW/rack = ~10–20 racks per MW). (Construction Review Online, Jun 2025)
• Hyperscaler combined capex projections for 2025: ~$180 billion across AWS, Microsoft, Google, and Meta. A portion flows to physical infrastructure including racks. (Construction Review Online)

Forecast / directional

• US data center capacity is expected to double by 2030 from current levels. est.
• The rack market is forecast to grow from $4.6B (2024) to $9.4–10.5B by 2030–2034 — est. 8–13% CAGR. (MarketsandMarkets, GM Insights, Strategic Market Research)
• AI racks at 50–100+ kW command est. 2–3x the ASP of standard 10–15 kW racks due to reinforced structure, liquid cooling integration, and custom form factors. As AI share of new builds increases, blended ASP per rack rises even if unit volumes grow slower than capacity in MW terms.
• NVIDIA's roadmap (Blackwell Ultra, Rubin, 2026–2027) pushes rack power to 250–900 kW and up to 1 MW per rack. At those densities, far fewer racks are needed per MW of IT load, but each rack is more complex and costly to build. (Introl / OCP 2025)
• Enclosed racks held ~63% of the market in 2024. The 43U–52U height segment is the fastest-growing, aligned with AI/HPC workloads. est. (Strategic Market Research)

Supply

Capacity

• Rack manufacturing is sheet metal fabrication, welding, powder coating, and assembly. Multiple vendors globally can ramp production.
• Key global suppliers include Schneider Electric (France), Rittal (Germany), Eaton (Ireland/US), Vertiv (US), HPE, Dell, Legrand, nVent, and numerous smaller regional manufacturers. Schneider and Rittal together hold roughly est. 15% market share. (GM Insights 2025)
• nVent is expanding capacity: CapEx guided at ~$130M for 2026 (up 40% YoY), new Blaine, MN facility started production in Q1 2026. (nVent Q1 2026 earnings)
• Vertiv net leverage is 0.2x with $5B liquidity. (Vertiv Q1 2026 earnings)

Bottlenecks

• Standard racks: sheet metal fabrication, not technically complex. Multiple vendors can and do ramp.
• Custom AI racks with integrated liquid cooling have fewer qualified suppliers. These require engineering coordination with GPU OEMs, cooling system vendors, and facility planners. nVent has an NVIDIA partner network designation for liquid cooling.
• Raw material inflation (primarily steel and copper) affects margins. nVent reported ~$60M of total inflation in Q1 2026, including ~$40M from tariffs. (nVent Q1 2026 earnings)
• Tariff exposure: nVent faces ~$170M total tariff headwind in 2026 ($90M carryover + $80M incremental). Vertiv has largely U.S.-manufactured products but imports some components. (nVent Q1 2026 earnings)

The gap

Demand for data center racks is growing at est. 8–13% annually in dollar terms. But the unit-volume story is more nuanced. AI racks at 50–100 kW handle 5–10x the compute per rack as legacy 10–15 kW racks. A data center that might have needed 1,000 standard racks can achieve the same compute with est. 150–200 AI racks. The rack count per MW of IT load is falling as density rises.

Revenue growth in racks comes primarily from ASP increases (est. 2–3x for AI-optimized racks) rather than unit volume. At the extreme — NVIDIA's 1 MW rack designs — a single rack replaces dozens of legacy units. The market grows in dollars, driven by complexity and integration.

For standard racks, multiple manufacturers worldwide can fabricate sheet-metal enclosures quickly. For AI-optimized racks with liquid cooling integration, the supplier pool is narrower. The primary bottlenecks in data center construction are power (interconnection queues average est. 55 months), cooling systems, and transformers.

Rack ASPs are rising because of the mix shift toward AI-optimized configurations. Vendors with deeper integration into the thermal and power stack (Vertiv, nVent, Schneider) capture more value per rack than pure sheet-metal fabricators.

The players

Note on PKG: Packaging Corporation of America (ticker PKG) is a corrugated cardboard and containerboard manufacturer. It does not make server racks, enclosures, or any data center infrastructure products. It is included in the table below because it was specified as a ticker, but its business has no connection to this product category.

Vertiv Q4 2025 & Q1 2026 earnings releases; nVent Q4 2025 & Q1 2026 earnings; PKG FY2025 10-K (StockAnalysis); market caps from StockAnalysis Jun 3, 2026.

The price of exposure

Vertiv (VRT) trades at $127B market cap on $10.2B FY2025 revenue and $1.9B free cash flow — 67x trailing FCF. On guided FY2026 adjusted EPS of $6.35 midpoint, the P/E is ~52x. Racks are a small, undisclosed fraction of Vertiv's revenue; the stock is exposure to the full DC infrastructure stack (power, thermal, services).

nVent (NVT) trades at $29B market cap on $3.9B FY2025 revenue and $561M free cash flow — ~51x trailing FCF. On guided FY2026 adjusted EPS of $4.50 midpoint, the P/E is ~39x. nVent's data center exposure grew from 12% of sales at spin-off (2018) to over 55% by Q1 2026. The Systems Protection segment (enclosures + liquid cooling, 71% of sales) grew 76% YoY in Q1 2026. Enclosures and liquid cooling are reported together; rack-only revenue cannot be isolated from public filings.

PKG trades at $20B on $9.0B revenue and $729M free cash flow (27x trailing FCF). It is a corrugated packaging company with zero data center rack exposure.

Neither VRT nor NVT is a pure-play rack company. Buying either for rack exposure means also buying power management (VRT), liquid cooling (both), electrical connections (NVT), and services. The rack business is embedded — and likely a low-single-digit percentage of revenue for each. est.

What to deep-dive next

• Isolate rack revenue. Neither VRT nor NVT discloses rack-specific revenue. 10-K product descriptions and investor day presentations may provide directional estimates, but no clean number exists in public filings.
• Private rack manufacturers. Rittal (Germany, privately held) and Schneider Electric's APC/NetShelter line are major rack competitors. Schneider + Rittal together hold est. ~15% share. Understanding their pricing and capacity plans matters for competitive dynamics.
• Unit economics at AI density. As racks go from 10 kW to 100+ kW, the number of racks per MW drops 5–10x but ASP rises 2–3x. The net effect on total addressable market in units vs. dollars needs quantification against specific hyperscaler build plans.
• Liquid cooling as the value driver. For both VRT and NVT, the growth story is liquid cooling, not racks. nVent has deployed 1+ GW of liquid cooling capacity. The cooling integration commands higher margins than the rack shell. Deep-dive the cooling TAM separately.
• Tariff and steel cost exposure. nVent reported $170M in total tariff headwinds for 2026. Steel is the primary raw material. Verify pass-through pricing power vs. margin compression.
• Verify PKG inclusion. PKG appears to be incorrectly assigned to this category. If the intent was a different ticker, clarify.

Sources & confidence