Product Overview
The Lian Li A3-mATX-WD-26.3L Micro Form Factor Chassis is a compact and versatile solution for building high-performance PCs. Designed in collaboration with DAN Cases, it features a unique wood front panel and extensive compatibility for various components, including large GPUs and advanced cooling solutions. Its modular design ensures ease of assembly and maintenance.

Figure 1: Lian Li A3-mATX-WD-26.3L Micro Form Factor Chassis with wood front panel.
Setup Guide
Package Contents
Please ensure all components are present before beginning assembly:
- Lian Li A3-mATX-WD Chassis
- Accessory Box (screws, zip ties, washers, plugs)
- User Manual
- Power Cable
Physical Assembly and Component Installation
The chassis features a highly modular design for easy assembly. Most panels and brackets are toolless for quick access.

Figure 2: Exploded view demonstrating modularity and removable panels.
Panel Removal
Side and top panels are designed for toolless removal. Simply pull them away from the chassis to detach. The bottom dust filter is magnetic and easily removable for cleaning.
Motherboard and CPU Installation
The chassis supports M-ATX and ITX motherboards. Install your CPU onto the motherboard socket before mounting the motherboard into the chassis.
Video 1: Overview of internal components and fan installation in the Lian Li A3 PC Case.
Power Supply Unit (PSU) Installation
The chassis offers versatile PSU mounting options, supporting ATX, SFX, SFX-L, and Lian Li Edge power supplies. PSUs can be mounted either frontways or sideways depending on your configuration needs and GPU length.
Video 2: Detailed guide on front and side PSU installation in the A3 chassis.
Cooling System Installation (Fans & Radiators)
The chassis supports up to a 360mm radiator and 10 x 120mm fans. Refer to the diagrams below for optimal fan and radiator placement based on your PSU and GPU configuration.

Figure 3: Space maximized for cooling with various fan and radiator sizes.
Graphics Processing Unit (GPU) Installation
The chassis accommodates GPUs up to 415mm in length. An anti-sag GPU bracket is included to ensure perfect alignment and support for your graphics card.

Figure 4: Anti-sag GPU bracket ensures proper graphics card support.
Operating Instructions
Once all components are securely installed and connected, plug the power cable into the chassis and a power outlet. Press the power button located on the front I/O panel to start your system.

Figure 5: Front I/O panel with USB ports, power button, and audio jacks.
Maintenance
Regular maintenance ensures optimal performance and longevity of your chassis. The magnetic bottom dust filter should be removed and cleaned periodically to prevent dust buildup and maintain airflow.
Troubleshooting
Missing Parts
If any parts are missing upon unboxing, please contact Lian Li customer support with your purchase details.
Cable Management Challenges
The chassis offers various cable routing options. Utilize the modular brackets and ample space behind the motherboard tray for efficient cable management. Refer to the installation videos for guidance.
Overheating Issues
Ensure all fans and radiators are correctly installed and oriented for proper airflow. Verify that the bottom dust filter is clean and not obstructing intake. Check component compatibility with the chassis's cooling capacities as detailed in the specifications.
Product Specifications
| Feature | Specification |
|---|---|
| Brand | Lian Li |
| Model Name | A3-mATX-WD Black |
| Item Weight | 11.02 pounds |
| Product Dimensions | 17.4"D x 7.63"W x 12"H |
| Color | Black |
| Material | Stainless Steel |
| Case Type | Mini-Tower |
| Motherboard Support | M-ATX, ITX |
| GPU Length Support | Up to 415mm |
| Radiator Support | Up to 360mm |
| Fan Support | Up to 10 x 120mm |
| PSU Support | ATX/SFX/SFX-L, Lian Li Edge (front/sideways mount) |
| Total USB Ports | 3 |
Warranty and Support
This product is covered by Lian Li's standard manufacturer warranty. For detailed warranty information, technical support, or service inquiries, please visit the official Lian Li website or contact their customer service department.


