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White Micro ATX tower with mesh front panel, tempered glass side panel and steel frame

ASUS

ASUS A21/WHT// Micro ATX PC Case White

SKU CH-MPAW-C0874 MPN A21/WHT//

White Micro ATX case with tempered glass, 40% porous mesh front, 33 mm cable routing space and support for 360 mm radiators plus 380 mm GPUs

  • TypeMicro ATX
  • ColorWhite
  • Case MaterialSteel / Plastic / Tempered Glass
  • Motherboard CompatibilityMicro ATX / Mini ITX
  • Dust FiltersBottom / Top
  • Internal 3.5" Drive Bays2

Options A21 (White)

  • Clean cable management with hidden connector motherboard support
  • Strong airflow from 40 percent porous front mesh panel
  • Fits 360 mm radiators front and top for high-end liquid cooling
  • Spacious 33 mm rear compartment keeps wiring tidy
  • White colour-matched internal I/O cables complete the theme

Micro ATX Case for Clean Builds

The ASUS A21/WHT// is a white Micro ATX chassis built from steel, plastic and tempered glass. It accepts Micro ATX and Mini ITX motherboards and includes hidden-connector support for BTF boards. Two 3.5-inch and one 2.5-inch internal bays handle storage, while five expansion slots cover full-length add-in cards. Front I/O supplies two USB 3.2 Gen 1 ports and dual audio jacks.

Sustained Load Cooling Behaviour

A 40-percent porous front mesh feeds up to three 120-millimetre or two 140-millimetre intake fans, matched by identical top mounts and a single 120-millimetre rear exhaust. Radiator clearance reaches 360-millimetre units at front and top, letting liquid loops dissipate heat continuously without throttling. Dust filters on bottom and top panels protect the airflow path during long sessions.

Upgrade Path from Tighter Chassis

The 33-millimetre cable-management compartment and colour-coordinated internal I/O cables replace the cramped routing found in many budget cases. Builders moving from enclosures limited to 240-millimetre radiators or shorter graphics cards gain headroom for 380-millimetre GPUs and 165-millimetre CPU coolers. The jump is worthwhile when a compact footprint must still swallow high-wattage components.

Highlights

  • Clean cable management with hidden connector motherboard support
  • Strong airflow from 40 percent porous front mesh panel
  • Fits 360 mm radiators front and top for high-end liquid cooling
  • Spacious 33 mm rear compartment keeps wiring tidy
  • White colour-matched internal I/O cables complete the theme

Specifications

BrandASUS
ModelA21/WHT//
Part Number90DC00H3-B08000
TypeMicro ATX
ColorWhite
Case MaterialSteel / Plastic / Tempered Glass
Motherboard CompatibilityMicro ATX / Mini ITX
Dust FiltersBottom / Top
Internal 3.5" Drive Bays2
Internal 2.5" Drive Bays1
Expansion Slots5
Front Ports2 x Audio, 2 x USB 3.2 Gen 1
Fan OptionsFront: 3 x 120 mm / 2 x 140 mm
Top: 3 x 120 mm / 2 x 140 mm
Rear: 1 x 120 mm
Radiator OptionsFront:120 mm / 140 mm / 240 mm / 280 mm / 360 mm
Top: 120 mm / 140 mm / 240 mm / 280 mm / 360 mm
Rear: 120 mm
Max GPU Length380 mm
Max CPU Cooler Height165 mm
Max PSU Length210 mm
Dimensions18.3" x 8.7" x 16.9"
Weight18.52 lbs.
Shipping weight8.39 kg
Package size508 × 508 × 279 mm

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Questions about this item

How loud does the case get when fans are running all day?

The 40% porous front mesh balances airflow and dust filtering, so installed fans can move air at lower speeds for quieter operation.

What extra parts do I need before this case is usable?

You must supply a Micro ATX or Mini ITX motherboard, a power supply up to 210 mm long, a CPU cooler no taller than 165 mm, and your own storage drives.

Will my existing 360 mm radiator fit alongside the motherboard tray?

Yes, the case supports a 360 mm radiator in the front or top, and the 33 mm cable-management compartment behind the tray leaves room for tubing.

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