Noctua Nf-a4x20 Flx 4cm Fan 20mm Cooling Fan 5v/12v And 3pin /4pin Pwm Thickness Heat Dissipation Chassis Small Fan - Fans & Cooling - AliExpress
Creality Noctua NF-A4x10 PWM 40mm x 10mm Ultra Quiet Silent Fan 12V 3-Pin Premium Cooling Fan for CR-10 S4/CR-10 S/CR-10/CR-10 S5/CR-10 mini 3D Printer