The Mini Tower gaming platform from the popular brand Asus is designed with a hidden cable routing concept. The main feature of the chassis is its full compatibility with micro-ATX motherboards, which have primary connectors located on the reverse side of the PCB. For routing such cable paths behind the tray, a spacious compartment with a width of 33 mm is provided. The front panel is made of a steel mesh with 40% porosity to balance fresh air intake and dust filtration.

Basic airflow for the components is provided by four pre-installed 120mm fans with ARGB lighting controlled by the Asus Aura Sync ecosystem. When scaling the cooling system, the Asus A21 Plus computer case allows the installation of large 360mm liquid cooling radiators on the front and top sides. The interior space, sealed by a transparent tempered glass side window, is designed to accommodate graphics cards up to 380mm long, tower coolers up to 165mm high, and standard ATX power supplies up to 210mm.

The disk subsystem is based on a removable cage for two 3.5" or 2.5" drives, plus there is space for a separate 2.5-inch SSD. The port block on the top panel includes two USB-A 5Gbps connectors and a combined audio output. To maintain the visual integrity of the build, all internal I/O wires are white-colored to match the main color of the 8kg steel construction. The critical aspects that make this product stand out are the full compatibility with micro-ATX motherboards, the spacious 33 mm cable management compartment, ARGB fans with Asus Aura Sync, support for large 360 mm radiators, and the clear tempered glass side window.

All specifications

Specifications A21 Plus White

Colour

Features	gaming
Form factor	Mini Tower
Mount	vertical
Motherboard support	micro-ATX
Board placement	vertical
Reverse layout motherboard support
PSU form factor	ATX (regular)


Computer case
Dimensions (HxWxD)	465x220x430 mm
PSU max lenght	210 mm
Graphics card max lenght	380 mm
Fan max height	165 mm
Weight	8.1 kg
Material	steel
Lighting type	backlit fan
Lighting colour	ARGB
Lighting sync	Asus Aura Sync
Side panel	removable


Storage
PSU
PSU mount	bottom
3.5" bays	2 / 2.5" Combo /
internal 2.5" compartments	1
Expansion slots	5

Cooling
Installed fans	4 шт 120 mm
Fans (back)	1x120mm
Fans (front)	2x140mm / 3x120mm /
Fans (top)	2x140mm / 3x120mm /
Fan mounts total	7
Dust filter	top and bottom
Liquid cooling system support


Liquid cooling system
Liquid cooling (rear)	120 mm
Liquid cooling (front)	360 mm
Liquid cooling (top)	360mm
Liquid cooling mounts	3


Connectors and functions
Placement	on top of the case
USB-A 5Gbps	2 pcs
Audio (microphone/headphones)


More features
Front panel	lattice
Side panel window	tempered glass
More features	removable HDD cage hidden wiring CPU cooling mount window
Official Website	asus.com
Added to E-Catalog	February 2024
P/N	90DC00H3-B19000 90DC00H3-B19010

E-Catalog UK editor, Computer Cases

Valerii Lenko, edited 12.05.2026

The information in the model description is for reference purposes.
Always clarify the specifications and configuration of the product with the online store manager before purchasing.
Catalog Asus 2026 - new arrivals, bestsellers, and the most relevant models Asus.

Shine Bright: Everything You Ever Wanted to Know About PC RGB LightingWe understand how the backlight appeared in the PC, how it is useful, and what synchronization systems are on the market

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	Asus 90DC00H3-B19010 Discover the ultimate foundation for your next high-performance PC with the ASUS A21 Plus TG ARGB PC tower case. Expertly cra... morefted for builders and gamers who prioritize both superior thermal management and striking visual appeal, this case provides a versatile and spacious environment for your most ambitious projects. Its brilliant white finish and integrated lighting create a clean, modern centerpiece for any setup.Experience exceptional cooling potential right from the start. The A21 Plus is engineered for maximum airflow, featuring a front panel optimized to draw in cool air and efficiently dissipate heat. This high-airflow design, combined with three pre-installed 120 mm ARGB front fans, ensures your critical components remain stable even during the most intense gaming sessions or heavy workloads. The chassis offers extensive cooling flexibility, providing ample room for additional fans and robust support for a large 360 mm liquid cooling radiator, allowing for elite-level thermal control.Build without constraints in this remarkably spacious large tower. The intelligent interior layout provides broad compatibility for a wide array of high-end hardware. It comfortably accommodates various motherboard sizes, including standard ATX and Micro ATX form factors, giving you the freedom to choose the perfect platform for your build. With generous clearance for graphics cards up to 38 cm in length and CPU coolers up to 16.5 cm in height, installing powerful, top-tier components is a seamless experience.Showcase your system in style. A stunning, full-view tempered glass side panel offers an unobstructed look at the heart of your machine. The integrated ARGB illumination bathes your components in vibrant, customizable multi-color lighting, easily controlled to match your aesthetic. Beyond its beauty, the A21 Plus is designed for pristine organization. A dedicated and wide cable management channel behind the motherboard tray allows you to neatly route and conceal cables, resulting in a clean, professional build that not only looks incredible but also promotes better airflow.Technical SpecificationsNumber of 3.5 bays:1.Product colour:White.Maximum graphics card length:38 cm.Number of 2.5 bays:1.Supported motherboard form factors:micro ATX.Supported motherboard form factors:Mini-ITX.Type:PC.Illumination:Yes.Illumination colour:Multi.Maximum CPU cooler height:16.5 cm.Number of expansion slots:5.Maximum PSU length:21 cm.Height:465 mm.Depth:430 mm.Width:220 mm.Weight:8.1 kg.Package width:525 mm.Package height:493 mm.Package weight:9.8 kg.Package depth:288 mm.Supported HDD sizes:3.5.Supported HDD sizes:2.5.HDD/SSD combo cage:Yes.USB 3.2 Gen 1 (3.1 Gen 1) Type-A ports quantity:2.Front fans installed:3x 120 mm.Rear fans diameters supported:120 mm.Top fans diameters supported:120.Top fans diameters supported:140 mm.Top radiator sizes supported:140 Tradeinn.com Delivery: in United Kingdom Report		£54.99 Buy in shop

	ASUS A21 PLUS Micro Tower White ASUS A21 PLUS Micro Tower White The ASUS A21 PLUS microATX case offers support for hidden-connector motherboards. 360 mm radi... moreators and 380 mm graphics cards. with two color options. four pre-installed ARGB fans and clean cable management. Pcnova.co.uk Delivery: in United Kingdom Report		£76.16 Buy in shop

	Open Box ASUS A21 PLUS MicroATX ARGB White Gaming Case Scan.co.uk Delivery: to United Kingdom Report		£79.99 Buy in shop

	ASUS A21 PLUS MicroATX ARGB White Gaming Case Scan.co.uk Delivery: to United Kingdom Report		£89.99 Buy in shop

	ASUS TUF Gaming GT301 Compact ATX Mid-Tower Case - 3x120mm ARGB Fans, 360mm Radiator, Tempered Glass, Aura Sync - White The ASUS TUF Gaming GT301 delivers a feature-packed compact ATX mid-tower with three pre-installed 120mm Aura Sync ARGB fans,... morea tempered glass side panel, and 360mm front radiator support in a white chassis. An integrated six-port ARGB hub and dedicated front panel button provide instant lighting control without software. Awd-it.co.uk Delivery: to United Kingdom Report		£89.99 Buy in shop

	ASUS A21 PLUS White 90DC00H3-B19000 The ASUS A21 PLUS microATX case offers support for hidden-connector motherboards 360 mm radiators and 380 mm grap... morehics cards with two color options four pre-installed ARGB fans and clean cable management. - Hidden Connectors: Compatible with motherboards featuring hidden connectors and maximizes clean cable management for a clutter-free build. - Broad Compatibility: A21 PLUS supports up to 360 mm radiators graphics cards up to 380 mm in length and CPU air coolers up to 165 mm in height. - Capable Cooling: A21 PLUS features four ARGB fans for exceptional cooling and the front-panel mesh is 40% porous to maximize the balance of airflow dust filtering and RGB visibility. - Ample cable management: The A21 PLUS provides a compartment behind the motherboard that is 33 mm wide to keep your wiring tucked away and tidy. Discover Hidden Potential The ASUS A21 PLUS is a PC case crafted for minimalist mainstream DIY PC builders with support for a variety of AIO coolers and graphics cards and the four pre-installed ARGB fans provide plenty of airflow potential to keep things running smoothly. Broad Compatibility Despite being a micro-ATX case the A21 PLUS still supports up to 360 mm radiators graphics cards up to 380 mm in length and CPU air coolers up to 165 mm in height giving builders plenty of options to assemble their next PC. Capable Cooling The front-panel mesh of the A21 PLUS is 40% porous to maximize the balance of airflow and RGB visibility. Within four pre-installed ARGB fans ensure ample cooling. Ample Cable Management The A21 PLUS provides a compartment behind the motherboard that is 33 mm wide to help you keep your wiring tucked away and tidy. Colour-Coordinated Builds Both variants of the A21 PLUS come with color-coordinated black or white internal I/O cables to compliment your build theme. Quzo.co.uk Delivery: to United Kingdom Report		£110.97 Buy in shop

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