Whether you are designing a micro-electronic wearable, configuring a high-density 1U server rack, or engineering a heavy-duty industrial control cabinet, thermal management is a critical factor for hardware reliability. At Fansco, we know that selecting the optimal cooling fan requires more than just knowing the physical dimensions; it requires a deep understanding of the complex matrix of sizes, abbreviations, and aerodynamic performance characteristics.
In this comprehensive guide, we decode the industry-standard naming conventions for DC axial fans, AC/EC fans, and centrifugal blowers. Bookmark this complete, exhaustive breakdown of fan form factors and their specialized applications to streamline your next OEM thermal design process.
1. The Underlying Logic of Fan Naming Conventions
Most industrial cooling fans follow a standard 4-digit or 5-digit abbreviation system, typically formatted as AABB or AAABB. This code serves as a universal shorthand for the fan’s physical form factor:
- The First 2 or 3 Digits: Represent the outer frame size in millimeters. For square fans, this is the side length. For round fans, this is the outer diameter.
- The Last 2 Digits: Represent the fan’s thickness (depth) in millimeters.
- Prefixes (Optional but Critical): Letters like “B” denote a Blower (centrifugal fan), “D” indicates DC power, “A” indicates AC power, and “E” often denotes highly efficient EC (Electronically Commutated) motors.
Engineering Tip: The CFM vs. Static Pressure Trade-off & System Impedance
While the frame size dictates the mounting hole spacing, the thickness is the primary driver of Static Pressure (measured in mmH2O or inH2O). A thicker fan (e.g., 38mm vs. 25mm) accommodates a steeper blade pitch and a more robust motor hub. Thicker fans are essential for forcing air through high-resistance environments—also known as high System Impedance—such as dense heatsinks, radiator fins, or tightly packed server chassis. Conversely, thinner fans prioritize raw airflow (CFM – Cubic Feet per Minute) in open-air, low-impedance environments.
2. The Comprehensive Fan Size & Application Matrix
To assist with your procurement and thermal design process, we have categorized the absolute complete spectrum of standard and niche fan sizes into five core industrial levels. Every single dimension is listed separately for exact matching. (Note: All dimensions are in millimeters, formatted as Length x Width x Thickness or Diameter x Thickness).
Level 1: Micro & Ultra-Compact Series (10mm – 35mm)
Core Objective: Chip-level active cooling in extremely confined spaces. These fans operate at incredibly high RPMs and are tailored for micro-electronics, IoT devices, and portable medical tech.
| Model Code | Dimensions (mm) | Deep Industry Applications |
|---|---|---|
| 2010 | 20 x 20 x 10 | HD camera PCB cooling, micro-projector light source cooling. |
| 2510 | 25 x 25 x 10 | Network routers, small wireless video transmission modules. |
| 2515 | 25 x 25 x 15 | Small industrial gateways requiring high static pressure, thickened portable baseband equipment. |
| 3010 | 30 x 30 x 10 | Micro-inverters, early 3D printer extruders, compact set-top boxes. |
| 3015 | 30 x 30 x 15 | Custom small-form-factor telecom modules. |
| 3510 | 35 x 35 x 10 | Highly efficient cooling modules for micro-embedded systems, special lens defogging. |
Level 2: Compact & Server Rack Series (36mm – 92mm)
Core Objective: High heat dissipation where space and height are strictly limited. Thickness is crucial here, especially the use of Dual Rotor (Counter-Rotating) technology to break static pressure limits in 1U/2U servers.
| Model Code | Dimensions (mm) | Deep Industry Applications |
|---|---|---|
| 3828 | 38 x 38 x 28 | The True 1U Server Secret. Specifically designed to maximize blade size within strict 1U height limits, pushing extreme static pressure. |
| 4010 | 40 x 40 x 10 | Small network switches, standard 3D printer mainboards. |
| 4015 | 40 x 40 x 15 | Enhanced cooling for dense network routers and modems. |
| 4020 | 40 x 40 x 20 | Compact server power supplies, industrial LED drivers. |
| 4028 | 40 x 40 x 28 | The 1U Server Standard. Often built with dual-ball bearings (15,000+ RPM) for immense air-pushing capabilities. |
| 4056 | 40 x 40 x 56 | Extreme 1U Server Core (Dual Rotor). Two 4028 fans connected in series for terrifying static pressure. |
| 4510 | 45 x 45 x 10 | Portable testing instruments, handheld industrial analyzers. |
| 5010 | 50 x 50 x 10 | Video surveillance DVR/NVRs, compact audio amplifiers. |
| 5020 | 50 x 50 x 20 | Medical diagnostic equipment requiring higher pressure than 5010. |
| 5028 | 50 x 50 x 28 | High-density core switches, special telecom-grade router equipment. |
| 6010 | 60 x 60 x 10 | HTPC (Home Theater PC) ultra-thin chassis cooling. |
| 6015 | 60 x 60 x 15 | LED stage lighting equipment, slim industrial PCs. |
| 6020 | 60 x 60 x 20 | Automated vending machines, casino gaming cabinets. |
| 6025 | 60 x 60 x 25 | Standard ATX/SFX power supplies, entry-level IPCs. |
| 6038 | 60 x 60 x 38 | The 2U / Blade Server Standard. High-density CPU cooling modules. |
| 6056 | 60 x 60 x 56 | 2U server violent dual-rotor fan, commonly used in dual-socket EPYC/Xeon high-density nodes. |
| 6076 | 60 x 60 x 76 | Extreme 2U dual-rotor fan. Aerospace-level RPMs designed to push air through ultra-long, high-density heatsink fins. |
| 7015 | 70 x 70 x 15 | Legacy AMD stock CPU coolers, specific medical imaging hardware. |
| 7025 | 70 x 70 x 25 | Specialized industrial panel PC cooling. |
| 7038 | 70 x 70 x 38 | Violent dedicated CPU fans for traditional tower servers. |
| 8010 | 80 x 80 x 10 | Ultra-slim PC chassis side panel ventilation. |
| 8015 | 80 x 80 x 15 | Slimline telecom racks, compact PC chassis fans. |
| 8020 | 80 x 80 x 20 | Medium-profile industrial chassis cooling. |
| 8025 | 80 x 80 x 25 | UPS (Uninterruptible Power Supplies), large power inverters, standard desktop exhaust. |
| 8032 | 80 x 80 x 32 | High-pressure telecom cooling, thick industrial power supplies. |
| 8038 | 80 x 80 x 38 | 3U servers, large telecom base station cabinets, crypto mining auxiliary cooling. |
| 8056 | 80 x 80 x 56 | 3U/4U rackmount storage server dual-rotor counter-rotating violent fan. |
| 8076 | 80 x 80 x 76 | Extreme thickness dual-rotor fan used for ultra-high heat telecom core routers. |
| 9025 | 90 x 90 x 25 | Distinct from 92mm; an exact 90mm frame often found in older Asian-market industrial equipment. |
| 9215 | 92 x 92 x 15 | Low-profile CPU coolers, slim form-factor workstations. |
| 9225 | 92 x 92 x 25 | OEM workstations (Dell/HP), 9cm tower CPU coolers, standard telecom cabinets. |
| 9238 | 92 x 92 x 38 | High-heat telecom cabinets, heavy industrial testing and calibration equipment. |
| 9256 | 92 x 92 x 56 | Dual-rotor booster fans dedicated to large OEM workstations/servers. |
| 9276 | 92 x 92 x 76 | Long-barrel dual-rotor fans dedicated to high-end edge computing nodes. |
Level 3: Mainstream & Heat Exchanger Series (100mm – 140mm)
Core Objective: The perfect balance of airflow volume and acoustic performance. This is the highest-volume category for both consumer DIY and standard industrial cooling.
| Model Code | Dimensions (mm) | Deep Industry Applications |
|---|---|---|
| 10025 | 100 x 100 x 25 | Niche OEM electronics, specialized air purifiers. |
| 12015 | 120 x 120 x 15 | Dedicated slim fans for SFF (Small Form Factor) chassis and thin liquid cooling radiators. |
| 12025 | 120 x 120 x 25 | The Industry Gold Standard. PC chassis, HVAC air purifiers, general control cabinets. |
| 12030 | 120 x 120 x 30 | The New Performance Sweet Spot.Designed specifically for high-end, thick-profile liquid coolers, computing workstations, and medical equipment. |
| 12038 | 120 x 120 x 38 | High-Density Computing. Bitcoin ASIC miners, large VFDs, ESS (Energy Storage System) thermal modules. |
| 12056 | 120 x 120 x 56 | External exhaust for liquid-cooled server racks, or insanely overclocked crypto miner dual-rotor cooling. |
| 12078 | 120 x 120 x 76 | Industrial wind tunnel testing equipment, extreme single-unit “push-pull” dual-rotor fans for thick radiators. |
| 12738 | 127 x 127 x 38 | Standard AC fan size. General industrial ventilation, older heavy machinery panels. |
| 13525 | 135 x 135 x 25 | Premium ATX power supplies (provides excellent airflow with a lower acoustic profile). |
| 13538 | 135 x 135 x 38 | High-power industrial power supplies requiring extreme airflow. |
| 14015 | 140 x 140 x 15 | Ultra-slim dual-tower CPU coolers, compact rackmount equipment. |
| 14025 | 140 x 140 x 25 | Emerging “thickened” size for enthusiast PC and high-end workstations, offering massive airflow & silence advantages. |
| 14030 | 140 x 140 x 30 | Premium silent PC chassis, commercial freezer condenser cooling. |
| 14038 | 140 x 140 x 38 | 5G outdoor telecom base stations, heavy-duty explosion-proof control cabinets. |
| 14051 | 140 x 140 x 51 | Extreme thickness, typically used for large cell towers, solar inverters, and wind power control boxes. |
Level 4: Heavy Industrial & Electrical Cabinet Series (150mm – 315mm+)
Core Objective: Massive air volume displacement. These fans often transition from DC to AC or high-efficiency EC motors, featuring die-cast aluminum frames for extreme environments.
| Model Code | Dimensions (mm) | Deep Industry Applications |
|---|---|---|
| 15038 | 150 x 150 x 38 | Medium-duty industrial enclosures, specialized telecom cabinets. |
| 15050 | 150 x 150 x 50 | Industrial dehumidifiers, heavy welding machines, solar inverter cooling. |
| 17225 | 172 x 150 x 25 | Slim telecom cabinet exhaust, space-constrained automation panels. |
| 17238 | 172 x 150 x 38 | Standard telecom rack exhaust, mid-level industrial cooling. |
| 17251 | 172 x 150 x 51 | Classic Industrial Oval Fan. CNC machine electrical boxes, UPS battery arrays. (Also widely available as 172×172 round). |
| 17272 | 172 x 150 x 72 | Ultra-thick heavy industrial exhaust with a terrifyingly high displacement volume. |
| 18060 | 180 x 180 x 60 | Automated assembly line control cabinets, wind turbine converter internals. |
| 19060 | 190 x 190 x 60 | Large customized telecom exchange switches and enterprise storage arrays. |
| 20030 | 200 x 200 x 30 | The industry standard for large full-tower PC front intake cooling. |
| 20060 | 200 x 200 x 60 | Enthusiast full-tower PC front panels, large industrial air compressors. |
| 20080 | 200 x 200 x 80 | Large agricultural greenhouse ventilation, specific tunnel construction ventilation equipment. |
| 22060 | 220 x 220 x 60 | Large cold storage evaporators, high-power transformer forced air cooling. |
| 22080 | 220 x 220 x 80 | Bottom air supply units for data center CRAC (Computer Room Air Conditioning) systems. |
| 22580 | 225 x 225 x 80 | Heavy industrial HVAC systems, large-scale greenhouse ventilation. |
| 25089 | 250 x 89 (Round) | Heavy-duty round duct exhaust, localized factory floor fume extraction systems. |
| 25489 | 254 x 89 (Round) | Heavy-duty industrial exhaust, data center In-Row cooling systems. |
| 28080 | 280 x 80 (Round) | Commercial rooftop ventilation, major factory floor exhaust networks. |
| 30080 | 300 x 300 x 80 | Massive air volume class, forced air intake at the base of industrial cooling towers. |
| 31589 | 315 x 89 (Round) | Bridging the gap between component cooling and pure HVAC. Used in massive warehouse air handling units. |
Level 5: Centrifugal Blowers (Special Form Factor)
Core Objective: Altering airflow direction. Blowers intake air from the side and exhaust it at a 90-degree angle, designed specifically to push concentrated air through extremely high-resistance channels and localized heat zones.
| Model Code | Dimensions (mm) | Deep Industry Applications |
|---|---|---|
| B1504 | 15 x 15 x 4 | Active micro-centrifugal blowers inside e-sports gaming phones. |
| B2006 | 20 x 20 x 6 | Micro active-cooling blowers hidden inside high-end smartwatches. |
| B2508 | 25 x 25 x 8 | Targeted micro-display chip cooling for AR/VR smart glasses. |
| B3010 | 30 x 30 x 10 | Pocket-sized air quality monitors, wearable cooling devices. |
| B3510 | 35 x 35 x 10 | Micro-sensor targeted cooling, VR headset internals. |
| B4010 | 40 x 40 x 10 | Ultra-compact scientific instruments, portable gas sniffers. |
| B4020 | 40 x 40 x 20 | Compact networking gear, targeted server chassis exhaust. |
| B4510 | 45 x 45 x 10 | Side-blowing exhaust fans for modern ultra-thin handheld gaming consoles. |
| B4520 | 45 x 45 x 20 | Handheld gaming consoles, specific medical device cooling modules. |
| B5010 | 50 x 50 x 10 | Standard single/dual fan cooling modules for high-end business Ultrabooks. |
| B5015 | 50 x 50 x 15 | The 3D Printing Standard for focused part cooling; laptop internal exhaust. |
| B5020 | 50 x 50 x 20 | High-pressure laptop cooling, thick 3D printer hotend cooling. |
| B5025 | 50 x 50 x 25 | Targeted blowing for heavy laboratory analysis instruments requiring immense static pressure. |
| B6015 | 60 x 60 x 15 | Thin IPC (Industrial PC) chassis targeted exhaust. |
| B6020 | 60 x 60 x 20 | Targeted cooling through internal guide channels in mid-sized industrial computers. |
| B6028 | 60 x 60 x 28 | Standard blower for slim 1U servers and enterprise networking gear. |
| B7025 | 70 x 70 x 25 | Mid-sized projector cooling, automated teller machines (ATMs). |
| B7515 | 75 x 75 x 15 | The primary high-volume turbine used in high-end ultra-thin gaming laptops. |
| B7530 | 75 x 75 x 30 | Projector light source cooling, automotive cabin air purifiers, robotic vacuum motors. |
| B8030 | 80 x 80 x 30 | Specialized industrial localized cooling, medical CPAP machines. |
| B8530 | 85 x 85 x 30 | Often found in high-end car seat climate control systems. |
| B9733 | 97 x 97 x 33 | Heavy equipment spot-cooling, industrial ventilation, outdoor BBQ blowers. |
| B12032 | 120 x 120 x 32 | Cleanroom Fan Filter Units (FFU), commercial induction cooktops, fresh air systems. |
| B12038 | 120 x 120 x 38 | High-power industrial drying equipment, heavy-duty automotive seat cooling. |
| B13033 | 130 x 130 x 33 | Commercial kitchen exhaust equipment, large laser cutter smoke extraction assist. |
| B14040 | 140 x 140 x 40 | Localized, powerful directional ventilation inside the cabins of heavy construction machinery. |
| B15050 | 150 x 150 x 50 | Large industrial drying tunnels, centrifugal impellers inside massive-scale dehumidifiers. |
Level 6: Crossflow & Tangential Fans
Core Objective:Planar, wide-span heat dissipation and air curtains. Intake and exhaust are perpendicular, with a flat rectangular exhaust port. Designed for environments requiring uniform, blind-spot-free airflow across extremely long and narrow spaces.(Note: Dimensions are strictly formatted as Impeller Diameter x Length).
| Model Code | Dimensions (mm) | Deep Industry Applications |
|---|---|---|
| C25090 | 25 x 90 | Compact defrosters, micro linear LED array cooling, portable heater internal blowers. |
| C30150 | 30 x 150 | Smart toilet drying modules, high-end commercial oven door cooling, precision instrument wide-span sweep cooling. |
| C40200 | 40 x 200 | Treadmill motherboard and motor cooling, concealed elevator cabin ventilation, medium household tower fans. |
| C50300 | 50 x 300 | Core component for industrial air curtains, side sweep exhaust for large server network cabinets. |
| C60300 | 60 x 300 | Heavy-duty commercial freezer defogging, large textile machinery drying, underfloor heating convection radiators. |
| C65430 | 65 x 430 | Large commercial split-system indoor AC units, ultra-wide industrial drying assembly lines. |
Level 7: Backward Curved Motorized Impellers (High-Pressure Series)
Core Objective:High-static pressure output without a scroll housing. These fans pull air axially and expel it 360° radially. In industrial procurement, these are standardized by Impeller Diameter, while thickness varies dynamically based on the integrated motor type (AC/DC/EC) required for the specific power draw.
| Standard Diameter | Common Thickness (mm) | Deep Industry Applications |
|---|---|---|
| Ø 133 mm | 70 – 91 | Medical-grade laminar flow hoods, compact telecom cabinet heat exchangers. |
| Ø 175 mm | 68 – 95 | The Compact Ventilation Standard. High-end residential ERV/HRV units, compact commercial air purifiers. |
| Ø 190 mm | 60 – 70 | The Cleanroom Standard. The golden size for FFU (Fan Filter Units) in semiconductor fabs. |
| Ø 220 mm | 71 – 90 | Data center In-Row cooling architectures, railway inverter forced air cooling. |
| Ø 250 mm | 99 – 120 | ESS (Energy Storage System) containers, wind turbine nacelle ventilation. |
| Ø 280 mm | 120 – 160 | Precision Cooling Standard. Widely used in CRAC units for mid-sized server rooms and AHUs. |
| Ø 310 mm | 100 – 160 | Enterprise Thermal Management. Large-scale industrial fluid chillers, high-capacity data center CRAC systems. |
| Ø 355 mm | 145 – 190 | Heavy-Duty Industrial Cooling. Large-scale solar inverters, thermal management for wind turbine converters, and modular data center AHU (Air Handling Units). |
| Ø 400 mm | 150 – 220+ | Infrastructure Grade. Massive data center cooling towers, industrial fluid chillers, and large-scale railway traction converter cooling systems. |
Level 8: Frameless & Custom Embedded Impellers (OEM Specialized)
Core Objective:Ultimate space optimization for modern SFF (Small Form Factor) and ultra-mobile devices. These units eliminate the traditional external plastic frame (“zero bezel” approach) to save critical millimeters, integrating the motorized hub and blades directly into the device’s own chassis or heatsink shroud. These are typically Non-Standard (OEM) and categorized by blade diameter and ultra-low profile thickness.
| Morphological Type | Focus Dimensions (mm) | Deep Industry Applications |
|---|---|---|
| Ultra-Thin Bare Impeller | Dia: 45 – 65
Thick: 3.5 – 5 |
Custom cooling for MacBook-class Ultrabooks, premium gaming laptops, and mobile workstations. |
| Open-Air GPU Fan | Dia: 75, 85, 95
Thick: 10 – 15 |
High-performance AIB graphics cards (dual/triple fan setups), low-profile ITX CPU coolers. |
| Micro-Blower Core | 15 x 15 x 4 (B1504) | Active mechanical cooling for flagship gaming smartphones (e.g., RedMagic series), AR/VR headsets. |
3. Beyond Dimensions: Advanced Procurement & Engineering Criteria
While the physical size ensures the fan fits mechanically into your chassis, the internal specifications dictate the lifespan, acoustic profile, and performance reliability. When analyzing the P-Q (Pressure-Flow) curve and selecting a custom thermal solution from Fansco, ensure you also define the following parameters:
- Bearing Type: Sleeve bearings are cost-effective but have a shorter lifespan and should only be mounted vertically. Dual-Ball bearings are the industrial standard for extreme longevity, high-temperature tolerance, and mounting in any orientation. FDB (Fluid Dynamic Bearing) is reserved for premium, ultra-silent equipment.
- Voltage Requirements: Typical DC fans run at 5V, 12V, 24V, or 48V (standard in telecom and servers to reduce current draw). Heavy machinery typically utilizes AC or EC fans running at 110V, 220V, or 380V.
- Intelligent Control Signals:
- PWM (Pulse Width Modulation): Allows the motherboard to adjust fan speed in real-time based on thermal loads (standard 4-pin design), saving energy and reducing noise.
- FG (Frequency Generator): A tachometer wire that outputs the current RPM, allowing the system to monitor fan health.
- RD (Rotation Detector): An alarm wire that instantly alerts your system if the fan stops spinning, preventing catastrophic hardware failure.
- IP Rating (Ingress Protection): For harsh industrial, marine, or outdoor telecom applications, it is critical to specify fans with conformal coating or fully encapsulated motors (e.g., IP55, IP68) to resist severe dust, moisture, and water ingress.
Need expert engineering support for your next project? Don’t leave your thermal management to chance. Explore Fansco’s extensive catalog of industrial fans, or contact our engineering team today to match your exact wattage dissipation, system impedance, and space constraints with the perfect cooling solution.
