It's solder fume extractor yet. I add pwm speed for fan to limited noise if you choice noisy fan. For this project , i have took a older fan computer and i dont remember if it noisy To realize this project ,you need some element: - Fan 120x120 - Visualization charging battery ( 4PCS 3S 3 Series Lithium Battery Capacity Indicator Module Lead-Acid Ni-MH 11.1V 12V 12.6V 4 Sections Blue LED Display Electric Vehicle Battery Power Tester Li-po Li-ion) - Battery 18650 (x1) - TP4056 Module with protection - MT3608 Step up DC DC - Simple holder battery 18650 - The 3 last elements , you can take this pack IZOKEE 3pcs TP4056 Module avec Protection + 3pcs MT3608 Convertisseur Tension Step Up DC-DC + 5pcs Support de Batterie - Rocker switch (x1) - pwm card for various speed fan DC 1.8V 3V 5V 6V 12V 2A PWM Régulateur de Vitesse Moteur à Courant Continu 1803BW - filter UEETEK filtres Charbon Actif pour litière de Chat Désodorisant 6pcs 04/10/2019: After print, the position of USB hole wasn't good place. I had modified support card because it was difficult to put on potentiometer And i can't put the battery