{"id":2467,"date":"2026-06-19T12:48:44","date_gmt":"2026-06-19T04:48:44","guid":{"rendered":"https:\/\/szfengheng.com\/?page_id=2467"},"modified":"2026-06-19T21:23:36","modified_gmt":"2026-06-19T13:23:36","slug":"ai-liquid-cooling","status":"publish","type":"page","link":"https:\/\/szfengheng.com\/de\/ai-liquid-cooling\/","title":{"rendered":"AI Server Liquid Cooling Fan Solutions | Fengheng Technology"},"content":{"rendered":"<h1>AI Server Liquid Cooling Fan Solutions<\/h1>\n<p><strong>Fengheng Technology<\/strong> supplies high-performance cooling fans purpose-built for AI data center liquid cooling architectures \u2014 including Rear-Door Heat Exchangers (RDHx), CDU pump stations, and GPU module auxiliary cooling. Established in 2011, ISO 9001 certified, with CE, RoHS, FCC, VDE and UKCA approvals.<\/p>\n<h2>Why AI Servers Still Need Fans in Liquid Cooling Systems<\/h2>\n<p>Modern AI data centers operate on a <strong>70% liquid \/ 30% air hybrid cooling architecture<\/strong>. Even in fully liquid-cooled rack deployments, high-static-pressure PWM fans remain essential for:<\/p>\n<ul>\n<li><strong>Rear-Door Heat Exchangers (RDHx)<\/strong> \u2014 fans pull warm exhaust air through chilled water coils, removing 30\u2013120 kW per rack<\/li>\n<li><strong>CDU Pump Station Heat Dissipation<\/strong> \u2014 fans cool the CDU chassis electronics and ensure safe ambient temperatures around the pump loop<\/li>\n<li><strong>GPU Module Auxiliary Cooling<\/strong> \u2014 DIMMs, power supplies, NICs and storage controllers are not covered by cold plates and require dedicated airflow<\/li>\n<li><strong>Telecom &#038; Edge AI Nodes<\/strong> \u2014 sealed enclosures with liquid cold plates still need airflow to handle residual heat from non-liquid-cooled components<\/li>\n<\/ul>\n<h2>Recommended Fengheng Products for Liquid Cooling Applications<\/h2>\n<table>\n<thead>\n<tr>\n<th>Model<\/th>\n<th>Size<\/th>\n<th>Voltage<\/th>\n<th>Max RPM<\/th>\n<th>Application<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>FH9225-PWM<\/td>\n<td>92\u00d725mm<\/td>\n<td>12V DC PWM<\/td>\n<td>4,500 RPM<\/td>\n<td>RDHx radiator fan, CDU station<\/td>\n<\/tr>\n<tr>\n<td>FH12025-PWM<\/td>\n<td>120\u00d725mm<\/td>\n<td>12V\/48V DC PWM<\/td>\n<td>3,800 RPM<\/td>\n<td>High-density rack liquid cooling assist<\/td>\n<\/tr>\n<tr>\n<td>FH12038-PWM<\/td>\n<td>120\u00d738mm<\/td>\n<td>12V DC PWM<\/td>\n<td>4,500 RPM<\/td>\n<td>CDU booster, high-airflow liquid cooling<\/td>\n<\/tr>\n<tr>\n<td>FH17251-EC<\/td>\n<td>172\u00d751mm<\/td>\n<td>220V EC<\/td>\n<td>2,800 RPM<\/td>\n<td>Large RDHx, row-level liquid cooling<\/td>\n<\/tr>\n<tr>\n<td>FH240-AL<\/td>\n<td>240mm Aluminum<\/td>\n<td>12V DC<\/td>\n<td>2,000 RPM<\/td>\n<td>Water-cooled aluminum radiator fan<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>Key Technical Specifications for AI Liquid Cooling Fans<\/h2>\n<ul>\n<li><strong>Voltage range:<\/strong> 12V \/ 24V \/ 48V DC; 110V \/ 220V \/ 380V AC\/EC<\/li>\n<li><strong>Speed control:<\/strong> 4-pin PWM (10\u2013100% speed range), 0\u201310V analog, RS485<\/li>\n<li><strong>Bearing type:<\/strong> Dual ball bearing \u2014 MTBF \u2265 50,000 hours @ 40\u00b0C<\/li>\n<li><strong>Operating temperature:<\/strong> \u221240\u00b0C to +105\u00b0C (wide-temp industrial grade)<\/li>\n<li><strong>Airflow:<\/strong> Up to 185 CFM (120\u00d738mm high-speed series)<\/li>\n<li><strong>Static pressure:<\/strong> Up to 0.85 inH\u2082O \u2014 suitable for dense heatsink\/radiator fin stacks<\/li>\n<li><strong>Certifications:<\/strong> CE, RoHS, FCC, VDE, UKCA, SGS, ISO 9001<\/li>\n<li><strong>IP rating:<\/strong> IP55 available for wet\/mist liquid cooling environments<\/li>\n<\/ul>\n<h2>Three Core Application Scenarios<\/h2>\n<h3>Scenario 1: Rear-Door Heat Exchanger (RDHx) Fans<\/h3>\n<p>RDHx units mount on the rear of server racks, removing heat from hot exhaust air before it enters the data center aisle. Active RDHx configurations require <strong>high-static-pressure fans<\/strong> to force airflow through dense copper\/aluminum fin coils. Fengheng 92\u00d725mm and 120\u00d738mm PWM fans are drop-in replacements for standard RDHx fan arrays, delivering up to 4,500 RPM with &lt;45dBA noise. Each unit removes 50\u2013120 kW per rack at typical data-center chilled-water supply temperatures of 18\u201320\u00b0C.<\/p>\n<h3>Scenario 2: CDU (Coolant Distribution Unit) Station Cooling<\/h3>\n<p>CDU pump stations circulate chilled water or dielectric fluid between the facility chiller and server cold plates. The CDU chassis itself \u2014 housing pumps, manifolds, heat exchangers, and control electronics \u2014 requires reliable ambient cooling. Fengheng 48V DC fans with dual-ball bearings and MTBF \u2265 50,000 hours are ideal for 24\/7 CDU operation. The 48V architecture reduces current draw by 4\u00d7 versus 12V, minimizing heat from the PDU and improving overall rack PUE.<\/p>\n<h3>Scenario 3: GPU Module &amp; Memory Auxiliary Cooling<\/h3>\n<p>Even in direct liquid-cooled AI compute nodes (e.g., NVIDIA HGX H100\/H200, AMD MI300X), DIMMs, VRMs, PCIe switches, and NVMe drives generate residual heat that cold plates do not cover. Server OEMs retain 2\u20134 system fans per 1U\/2U node to handle this airflow path. Fengheng slim-profile DC fans (25\u201360mm thickness) with PWM control are engineered for the tight mechanical envelopes of modern AI server trays.<\/p>\n<h2>Why Fengheng for AI Liquid Cooling<\/h2>\n<ul>\n<li>\u2705 <strong>Proven in premium automotive<\/strong> \u2014 Bentley Motors supplier since 2022; same engineering standards applied to data center fans<\/li>\n<li>\u2705 <strong>48V transition-ready<\/strong> \u2014 full 48V DC fan range matching next-gen Open Rack v3 \/ OCP power architecture<\/li>\n<li>\u2705 <strong>Dual counter-rotating fans<\/strong> \u2014 bidirectional airflow option for RDHx where both push and pull are required in a single module<\/li>\n<li>\u2705 <strong>AI-proportional thermal control<\/strong> \u2014 field-oriented vector control (FOC) PWM driver enables precise RPM management by BMC\/IPMI<\/li>\n<li>\u2705 <strong>Custom OEM\/ODM<\/strong> \u2014 Dongguan OEM facility (est. 2021) supports full customization: blade count, frame size, connector type, firmware<\/li>\n<\/ul>\n<h2>Frequently Asked Questions \u2014 AI Liquid Cooling Fans<\/h2>\n<h3>Q: Do liquid-cooled AI servers still need cooling fans?<\/h3>\n<p>A: Yes. In the dominant 70% liquid \/ 30% air hybrid architecture, fans are required for Rear-Door Heat Exchangers (RDHx), CDU station electronics, DIMMs, power supplies, NICs, and storage \u2014 components not covered by liquid cold plates. Eliminating fans entirely is only possible in full-immersion cooling, which currently represents less than 2% of AI server deployments.<\/p>\n<h3>Q: What fan size is recommended for a 120 kW RDHx unit?<\/h3>\n<p>A: A 120 kW RDHx typically uses a 6\u00d74 array of 80mm or 92mm fans, or a 2\u00d73 array of 120mm fans. Fengheng FH9225-PWM (4,500 RPM, 68 CFM each) and FH12038-PWM (4,500 RPM, 185 CFM each) are both field-validated in commercial RDHx deployments. Contact our engineering team for CFD-backed selection based on your specific fin pitch and water temperature.<\/p>\n<h3>Q: What voltage should I choose \u2014 12V or 48V DC?<\/h3>\n<p>A: For new AI rack builds, 48V DC is strongly recommended. It reduces current by 4\u00d7, allowing thinner power cables, lower resistive losses, and better compatibility with OCP Open Rack v3 and NVIDIA MGX power delivery. Fengheng offers a complete 48V fan portfolio from 40mm to 220mm. Legacy 12V racks can use our 12V\/48V dual-voltage models for a drop-in upgrade path.<\/p>\n<h3>Q: What MTBF do your liquid cooling fans achieve?<\/h3>\n<p>A: Fengheng dual-ball bearing fans achieve MTBF \u2265 50,000 hours (approximately 5.7 years of continuous operation) at 40\u00b0C ambient. This is validated per IEC 60068-2-6 vibration testing and ISO 16750-3 automotive-grade shock standards \u2014 the same testing applied to our Bentley Motors automotive fan supply program.<\/p>\n<h3>Q: Can fans operate in humid or mist-prone liquid cooling environments?<\/h3>\n<p>A: Yes. Fengheng IP55-rated fans are tested to withstand water jet ingress and sustained high-humidity environments, making them suitable for immersion-adjacent deployments, outdoor edge AI nodes, and environments where coolant micro-misting is a risk. FDA\/FDB fluid dynamic bearing models are also available for near-zero vibration in precision liquid cooling installations.<\/p>\n<h3>Q: Do you support PWM speed control for BMC\/IPMI integration?<\/h3>\n<p>A: Yes. All Fengheng 4-pin PWM fans are compatible with standard BMC (Baseboard Management Controller) and IPMI fan speed control. We also support 0\u201310V analog control, RS485 bus, and tachometer signal output for closed-loop thermal management integration. Custom firmware for specific PWM curves is available under NDA for OEM partners.<\/p>\n<h3>Q: What certifications do your fans carry for data center use?<\/h3>\n<p>A: CE, RoHS, FCC (USA), VDE (Germany), UKCA (UK), SGS, and ISO 9001:2015 quality management system. For data center applications requiring EMC compliance, we can provide pre-tested configurations. UL certification is available upon request for North American deployments.<\/p>\n<h3>Q: Can you supply OEM\/ODM custom fans for our liquid cooling product?<\/h3>\n<p>A: Yes. Our Dongguan OEM facility (established 2021) specializes in custom fan design and manufacturing for OEM and system integrators. Minimum order quantities, tooling timelines, and NDA terms available upon request. We have supplied custom fans to clients in the UK luxury automotive, Japanese electronics retail, and Singapore air purifier markets.<\/p>\n<h2>Request a Liquid Cooling Fan Sample or Quote<\/h2>\n<p>Contact Fengheng Technology to request engineering samples, custom specifications, or volume pricing for AI data center liquid cooling fan applications.<\/p>\n<ul>\n<li>\ud83d\udce7 Email: <a href=\"mailto:fengheng@adc-coolingfan.com\">fengheng@adc-coolingfan.com<\/a><\/li>\n<li>\ud83d\udcf1 WhatsApp: +86-181 0301 7365<\/li>\n<li>\ud83c\udf10 Product catalog: <a href=\"\/products-2\/\">View All Cooling Fans<\/a><\/li>\n<\/ul>\n<p><script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Do AI servers still need cooling fans when using liquid cooling?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. Even in liquid-cooled AI servers, cooling fans are still required for three reasons: (1) Rear-Door Heat Exchangers (RDHx) require high-static-pressure fans to push server exhaust through chilled-water fin coils; (2) CDU pump stations need fans to cool their control electronics, VFDs, and power supplies; (3) Components not covered by liquid cold plates \u2014 DRAM, VRMs, NICs, NVMe SSDs \u2014 still require airflow for cooling.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What type of fan is best for RDHx rear-door heat exchangers?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"High-static-pressure fans are required for RDHx applications, not standard high-airflow fans. The fin coil in an RDHx door creates 0.3\u20130.8 inH2O of system resistance. Fans must maintain sufficient airflow against this resistance. Recommended: 80\u2013120mm fans with static pressure ratings above 0.6 inH2O, PWM speed control, and dual ball bearings for MTBF exceeding 50,000 hours. Fengheng's FH92\u00d725mm and FH120\u00d738mm series are designed for this application.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the difference between 12V and 48V cooling fans for AI data centers?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"48V DC fans are becoming the standard for AI data center applications, driven by OCP Open Rack v3 and NVIDIA MGX specifications. At 48V, current is 4 times lower than at 12V for the same power, reducing copper cabling weight, I\u00b2R losses, and PDU complexity. 48V fans also achieve 5\u201315% higher motor efficiency. Fengheng offers 48V DC fans from 40mm to 220mm, compatible with OCP Open Rack v3 fan modules.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What MTBF should I require for cooling fans in AI server liquid cooling systems?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"For 24\/7 AI data center operation, require MTBF of at least 50,000 hours (approximately 5.7 years continuous). For mission-critical deployments, target 70,000\u201380,000 hours. Only fans with dual ball bearings reliably achieve MTBF above 50,000 hours \u2014 avoid sleeve-bearing fans in liquid cooling infrastructure. Fengheng's liquid cooling fan series achieves MTBF \u226570,000 hours at 40\u00b0C ambient, calculated per IEC 62380.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How many fans are needed in an active RDHx door for a 50kW AI rack?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"A typical active RDHx door for a 50kW AI rack uses 20\u201324 fans in a 4\u00d75 or 4\u00d76 array of 92mm or 120mm fans. The exact configuration depends on the fin coil's pressure drop curve. Fengheng recommends 24 units of FH92\u00d725mm fans (6 columns \u00d7 4 rows) for standard 42U racks up to 60kW, or 16 units of FH120\u00d738mm for racks up to 80kW.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can Fengheng Technology supply custom fans for CDU manufacturer OEM projects?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. Fengheng Technology provides OEM custom cooling fans for CDU manufacturers and liquid cooling system integrators. Custom options include: voltage (5V to 48V DC, 110V\/220V AC), connector and cable length, fan size and depth, IP rating for sealed environments, conformal coating for humidity protection, custom color and branding, and CE\/UL\/VDE certifications. Minimum order quantities start at 500 units. Contact szfengheng.com for engineering consultation and sample requests.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What liquid cooling fan products does Fengheng Technology supply?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Fengheng Technology (szfengheng.com) supplies the following fans for AI server liquid cooling applications: 92\u00d725mm and 92\u00d738mm high-static-pressure PWM fans for RDHx arrays; 120\u00d725mm and 120\u00d738mm DC fans for CDU electronics and Open Rack; 172\u00d751mm DC and EC axial fans for large CDU cabinets and ultra-high-density RDHx; 240mm radiator with fan mounting for edge AI and workstation liquid cooling; 48V DC variants for OCP Open Rack v3 compatibility. All products are CE, RoHS, and VDE certified with MTBF \u226550,000 hours.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the AI data center liquid cooling market size and growth?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The China intelligent computing center liquid cooling market reached 18.4 billion yuan in 2024 and is projected to reach 130 billion yuan by 2029, representing 7\u00d7 growth in 5 years (CAGR approximately 48%). Liquid cooling penetration in new AI data center deployments is rising from 14% in 2024 to an estimated 33% in 2025 and over 50% by 2026, driven by GPU power density increases from NVIDIA Hopper to Blackwell and AMD MI300X architectures.\"\n      }\n    }\n  ]\n}\n<\/script><br \/>\n<script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"Organization\",\n  \"name\": \"Fengheng Technology\",\n  \"alternateName\": \"Shenzhen City Fengheng Technology Co., Ltd.\",\n  \"url\": \"https:\/\/szfengheng.com\",\n  \"logo\": \"https:\/\/szfengheng.com\/wp-content\/uploads\/logo.png\",\n  \"description\": \"Chinese cooling fan manufacturer specializing in high-static-pressure PWM fans for AI server liquid cooling systems, RDHx, CDU cooling, and OCP Open Rack applications. 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