ASUS A21 Case The ASUS A21 micro-ATX case offers support for 360 mm radiators, and 380 mm graphics card, with two color options and clean cable management. - Broad Compatibility: A21 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: The front-panel mesh is 40% porous to maximize the balance of airflow, dust filtering and RGB visibility. - Ample cable management: The A21 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 is a PC case crafted for minimalist mainstream DIY PC builders, with support for a variety of AIO coolers and graphics cards, and plenty of airflow potential to keep things running smoothly. BROAD COMPATIBILITY Despite being a micro-ATX case, the A21 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. Support - 360mm Radiator - 380mm Graphics Card Length - 165mm CPU Cooler Height CAPABLE COOLING The front-panel mesh of the A21 is 40% porous to maximize the balance of airflow and RGB visibility. Users can add up to three 120 mm fans to this section of their build to solidly manage system temperatures. - 40 % porosity AMPLE CABLE MANAGEMENT The A21 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 come with color-coordinated black or white internal I/O cables to compliment your build theme. Model ASUS A21 Case Motherboard Support Micro-ATX Mini-ITX Drive Bays 1 x 2.5" Bay 2 x 2.5"/3.5" Combo Bay Expansion Slots 5 Front I/O Port 1 x Headphone 1 x Microphone 2 x USB 3.2 Gen1 Radiator Support (Front) 120 mm 140 mm 240 mm 280 mm 360 mm Radiator Support (Top) 120 mm 140 mm 240 mm 280 mm 360 mm Radiator Support (Rear) 120 mm Cooling Support (Front) 3 x 120 mm 2 x 140 mm Cooling Support (Top) 3 x 120 mm 2 x 140 mm Cooling Support (Rear) 1 x 120 mm Maximum CPU Cooler Height 165 mm Maximum GPU Length 380 mm Maximum PSU Length 210 mm Dimensions 220*430*465 mm Weight 7.3Kg
ASUS A21 Case The ASUS A21 micro-ATX case offers support for 360 mm radiators, and 380 mm graphics card, with two color options and clean cable management. - Broad Compatibility: A21 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: The front-panel mesh is 40% porous to maximize the balance of airflow, dust filtering and RGB visibility. - Ample cable management: The A21 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 is a PC case crafted for minimalist mainstream DIY PC builders, with support for a variety of AIO coolers and graphics cards, and plenty of airflow potential to keep things running smoothly. BROAD COMPATIBILITY Despite being a micro-ATX case, the A21 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. Support - 360mm Radiator - 380mm Graphics Card Length - 165mm CPU Cooler Height CAPABLE COOLING The front-panel mesh of the A21 is 40% porous to maximize the balance of airflow and RGB visibility. Users can add up to three 120 mm fans to this section of their build to solidly manage system temperatures. - 40 % porosity AMPLE CABLE MANAGEMENT The A21 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 come with color-coordinated black or white internal I/O cables to compliment your build theme. Model ASUS A21 Case Motherboard Support Micro-ATX Mini-ITX Drive Bays 1 x 2.5" Bay 2 x 2.5"/3.5" Combo Bay Expansion Slots 5 Front I/O Port 1 x Headphone 1 x Microphone 2 x USB 3.2 Gen1 Radiator Support (Front) 120 mm 140 mm 240 mm 280 mm 360 mm Radiator Support (Top) 120 mm 140 mm 240 mm 280 mm 360 mm Radiator Support (Rear) 120 mm Cooling Support (Front) 3 x 120 mm 2 x 140 mm Cooling Support (Top) 3 x 120 mm 2 x 140 mm Cooling Support (Rear) 1 x 120 mm Maximum CPU Cooler Height 165 mm Maximum GPU Length 380 mm Maximum PSU Length 210 mm Dimensions 220*430*465 mm Weight 7.3Kg
There are no live offers for Asus A21 Micro-ATX Case - Black right now. The all-time low we recorded was $55.00 on 4 Sept 2026. Set a price alert to hear when it's back in stock.
Prices last updated 4 Sept 2026.
Asus A21 Micro-ATX Case - Black
ASUS A21 Case The ASUS A21 micro-ATX case offers support for 360 mm radiators, and 380 mm graphics card, with two color options and clean cable management. - Broad Compatibility: A21 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: The front-panel mesh is 40% porous to maximize the balance of airflow, dust filtering and RGB visibility. - Ample cable management: The A21 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 is a PC case crafted for minimalist mainstream DIY PC builders, with support for a variety of AIO coolers and graphics cards, and plenty of airflow potential to keep things running smoothly. BROAD COMPATIBILITY Despite being a micro-ATX case, the A21 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. Support - 360mm Radiator - 380mm Graphics Card Length - 165mm CPU Cooler Height CAPABLE COOLING The front-panel mesh of the A21 is 40% porous to maximize the balance of airflow and RGB visibility. Users can add up to three 120 mm fans to this section of their build to solidly manage system temperatures. - 40 % porosity AMPLE CABLE MANAGEMENT The A21 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 come with color-coordinated black or white internal I/O cables to compliment your build theme. Model ASUS A21 Case Motherboard Support Micro-ATX Mini-ITX Drive Bays 1 x 2.5" Bay 2 x 2.5"/3.5" Combo Bay Expansion Slots 5 Front I/O Port 1 x Headphone 1 x Microphone 2 x USB 3.2 Gen1 Radiator Support (Front) 120 mm 140 mm 240 mm 280 mm 360 mm Radiator Support (Top) 120 mm 140 mm 240 mm 280 mm 360 mm Radiator Support (Rear) 120 mm Cooling Support (Front) 3 x 120 mm 2 x 140 mm Cooling Support (Top) 3 x 120 mm 2 x 140 mm Cooling Support (Rear) 1 x 120 mm Maximum CPU Cooler Height 165 mm Maximum GPU Length 380 mm Maximum PSU Length 210 mm Dimensions 220*430*465 mm Weight 7.3Kg
ASUS A21 Case The ASUS A21 micro-ATX case offers support for 360 mm radiators, and 380 mm graphics card, with two color options and clean cable management. - Broad Compatibility: A21 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: The front-panel mesh is 40% porous to maximize the balance of airflow, dust filtering and RGB visibility. - Ample cable management: The A21 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 is a PC case crafted for minimalist mainstream DIY PC builders, with support for a variety of AIO coolers and graphics cards, and plenty of airflow potential to keep things running smoothly. BROAD COMPATIBILITY Despite being a micro-ATX case, the A21 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. Support - 360mm Radiator - 380mm Graphics Card Length - 165mm CPU Cooler Height CAPABLE COOLING The front-panel mesh of the A21 is 40% porous to maximize the balance of airflow and RGB visibility. Users can add up to three 120 mm fans to this section of their build to solidly manage system temperatures. - 40 % porosity AMPLE CABLE MANAGEMENT The A21 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 come with color-coordinated black or white internal I/O cables to compliment your build theme. Model ASUS A21 Case Motherboard Support Micro-ATX Mini-ITX Drive Bays 1 x 2.5" Bay 2 x 2.5"/3.5" Combo Bay Expansion Slots 5 Front I/O Port 1 x Headphone 1 x Microphone 2 x USB 3.2 Gen1 Radiator Support (Front) 120 mm 140 mm 240 mm 280 mm 360 mm Radiator Support (Top) 120 mm 140 mm 240 mm 280 mm 360 mm Radiator Support (Rear) 120 mm Cooling Support (Front) 3 x 120 mm 2 x 140 mm Cooling Support (Top) 3 x 120 mm 2 x 140 mm Cooling Support (Rear) 1 x 120 mm Maximum CPU Cooler Height 165 mm Maximum GPU Length 380 mm Maximum PSU Length 210 mm Dimensions 220*430*465 mm Weight 7.3Kg
Last updated at 09/04/2026 18:47:33
ASUS A21 Micro-ATX Case White Edition Supports Graphics Cards up to 380mm, 360mm Coolers, & Standard ATX PSUs, Porous Front-Panel Mesh, Compatible
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ASUS A21 Tempered Glass Micro-ATX Case - Black (Avail: In Stock )
Free delivery between 8–15 Sept
ASUS MicroATX A21 Black Mesh Case CAAS-A21-BK | Best Online Computer Store
Delivery between 10–18 Sept $19.19
Asus A21 micro-ATX Case - White
Delivery between 10–14 Sept $36.55
ASUS A21/WHT// Steel/Plastic/Tempered Glass Micro ATX White Computer Case
Delivery $200
A21 ASUS CASE/WHT Gaming Computer Case - Micro ATX, Mini ITX Motherboard Supported - Mesh - White - 1 x Internal 2.5" Bay(s) - 2 x Internal 2.5"/3.5"
Free delivery between Tue – Fri
Asus A21/wht// Micro Atx Computer Case Steel / Plastic / Tempered
Delivery $227.49
Affiliate Disclosure: We may receive a small commission for purchases made through this link at no extra cost to you. This helps support our site. Thank you!
| Manufacturer Warranty | 1 Year |
ASUS A21 Micro-ATX Case White Edition Supports Graphics Cards up to 380mm, 360mm Coolers, & Standard ATX PSUs, Porous Front-Panel Mesh, Compatible
Affiliate Disclosure: We may receive a small commission for purchases made through this link at no extra cost to you. This helps support our site. Thank you!
ASUS A21 Tempered Glass Micro-ATX Case - Black (Avail: In Stock )
Free delivery between 8–15 Sept
ASUS MicroATX A21 Black Mesh Case CAAS-A21-BK | Best Online Computer Store
Delivery between 10–18 Sept $19.19
Asus A21 micro-ATX Case - White
Delivery between 10–14 Sept $36.55
ASUS A21/WHT// Steel/Plastic/Tempered Glass Micro ATX White Computer Case
Delivery $200
| Manufacturer Warranty | 1 Year |
