Fresh Air Intake Fan

A fresh air ventilation system is especially important for residential ventilation. It brings fresh air from outside to maintain indoor air quality, while keeping the room under positive pressure to prevent unfiltered air from entering from other areas of the house.To build one, you just need a 20 cm PC case fan and a 12V DC power adapter. Based on the performance of my regular fan, it can refresh the room's air up to six times per hour.Since I installed it, the air quality in my room has been excellent — every breath feels as fresh as being outdoors.It’s a very simple setup, but the results are truly remarkable and absolutely worth it.Note: Be sure to make the electrical connections correctly. The fan typically has four wires, but only two (positive and negative) need to be connected to the power adapter. Also, ensure that all connections are secure to avoid the risk of short circuits due to loose wires.