---
product_id: 233274468
title: "DB04028B12U 40mm Fan 4cm 4028 40x40x28mm 12V 0.66A Dual Ball Bearing 4-Wire 4pin PWM Server Power Airflow Cooling Fan"
brand: "ohmitcl"
price: "$27.08"
currency: USD
in_stock: true
category: "Ohmitcl"
url: https://www.desertcart.us/products/233274468-db04028b12u-40mm-fan-4cm-4028-40x40x28mm-12v-0-66a-dual
store_origin: US
region: United States of America
---

# 12V Power Efficiency 23.78 CFM Airflow 15000 RPM Speed DB04028B12U 40mm Fan 4cm 4028 40x40x28mm 12V 0.66A Dual Ball Bearing 4-Wire 4pin PWM Server Power Airflow Cooling Fan

**Brand:** ohmitcl
**Price:** $27.08
**Availability:** ✅ In Stock

## Summary

> 💨 Stay cool, stay ahead — power your setup with precision airflow!

## Quick Answers

- **What is this?** DB04028B12U 40mm Fan 4cm 4028 40x40x28mm 12V 0.66A Dual Ball Bearing 4-Wire 4pin PWM Server Power Airflow Cooling Fan by ohmitcl
- **How much does it cost?** $27.08 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/233274468-db04028b12u-40mm-fan-4cm-4028-40x40x28mm-12v-0-66a-dual)

## Best For

- ohmitcl enthusiasts

## Why This Product

- Trusted ohmitcl brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Smart PWM Control:** 4-wire 4-pin interface enables dynamic speed adjustments for optimized thermal management.
- • **Compact Yet Mighty:** Sleek 40x40x28mm size fits tight spaces without compromising on airflow or pressure.
- • **Whisper-Quiet Performance:** Operates at a modest 54 dB, balancing powerful airflow with minimal noise disruption.
- • **Durability Meets Reliability:** Double ball bearing design ensures an impressive 70,000-hour lifespan for long-term peace of mind.
- • **Precision Cooling Powerhouse:** Delivers up to 23.78 CFM airflow to keep your server running cool and efficient.

## Overview

The DB04028B12U is a high-performance 40mm server cooling fan featuring a robust double ball bearing system, 12V power input, and a 4-wire PWM interface for smart speed control. It delivers up to 23.78 CFM airflow at 15000 RPM while maintaining a low noise level of 54 dB. Designed for durability with a 70,000-hour lifespan, this compact fan is ideal for professional-grade server cooling and efficient thermal management.

## Description

Model DB04028B12U Size 40¡Á40¡Á28mm Bearing: Double ball bearing Interface 4-wire interface Voltage: 12V Current: 0.66A Power: 7.92W Operating voltage: 7.0-13.4V Speed up to 15000RPM¡À10% Radiator noise 54 dB Maximum air volume: 23.78 CFM (cubic feet per minute)=0.673 m3/min (m3/min) Maximum wind pressure: 1.32 inH2O (inch/water) = 33.65 mmH2O (mm/water) Fan life 70000 hours

## Features

- Model DB04028B12U
- Bearing: Double ball bearing
- Voltage: 12V
- Current: 0.66A
- Interface 4-wire interface

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B07ZDB4FPT |
| Air Flow Capacity | 23.78 Cubic Feet Per Minute |
| Best Sellers Rank | #634 in Computer Case Fans |
| Brand Name | OHMITCL |
| Compatible Devices | Server |
| Cooling Method | Air |
| Customer Reviews | 4.3 4.3 out of 5 stars (66) |
| Item Dimensions L x W x H | 1.57"L x 1.1"W x 1.57"H |
| Manufacturer | COCO |
| Material Type | Copper |
| Maximum Rotational Speed | 15000 RPM |
| Model | C0149 |
| Noise Level | 54 Decibels |
| Number of Items | 1 |
| Part Number | C0149 |
| Power Connector Type | 4-Pin |
| UPC | 730709034418 |
| Unit Count | 1.0 Count |
| Voltage | 12 Volts |
| Wattage | 7.92 watts |

## Product Details

- **Brand:** OHMITCL
- **Compatible Devices:** Server
- **Cooling Method:** Air
- **Material:** Copper
- **Maximum Rotational Speed:** 15000 RPM
- **Noise Level:** 54 Decibels
- **Power Connector Type:** 4-Pin
- **Product Dimensions:** 1.57"L x 1.1"W x 1.57"H
- **Voltage:** 12 Volts
- **Wattage:** 7.92 watts

## Images

![DB04028B12U 40mm Fan 4cm 4028 40x40x28mm 12V 0.66A Dual Ball Bearing 4-Wire 4pin PWM Server Power Airflow Cooling Fan - Image 1](https://m.media-amazon.com/images/I/61tGwEiq7-L.jpg)
![DB04028B12U 40mm Fan 4cm 4028 40x40x28mm 12V 0.66A Dual Ball Bearing 4-Wire 4pin PWM Server Power Airflow Cooling Fan - Image 2](https://m.media-amazon.com/images/I/51v1+cuB-oL.jpg)
![DB04028B12U 40mm Fan 4cm 4028 40x40x28mm 12V 0.66A Dual Ball Bearing 4-Wire 4pin PWM Server Power Airflow Cooling Fan - Image 3](https://m.media-amazon.com/images/I/51EORgrbhbL.jpg)

## Questions & Answers

**Q: which wire is positive?**
A: Wiring is in the order:
1. GROUND - Typically Black
2. +VDC - Typically Red
3. SENSE
4. PWM
Wire color can help you in identifying the starting pin number.

## Frequently Bought Together

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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-07-14*