There is only one caveat.
Connect two case fans to one header.
Second part will be about connecting up to 6 fans using same tools as in first case plus 4 pin molex cable and electric tape or shrinking tube or soldering iron tape.
If you want absolute control over your fans the best option would be a dedicated fan controller.
That s true for either dc fans or pwm.
If the total current drawn by the two fans is less than that rating they can share the header but not if the total current exceeds 1 amp.
This guide will divide in two parts.
One of them is how to connect 4 fans in 1 controller using only your hands and pin extractor or any thin tools like needle.
The easiest and cheapest option is to obtain a y splitter for the 2 fans and control them both with a single fan mate fan mate plugged into mother board then splitter going to the 2 fans.
This then leaves the other single fan and header conection to the motherboard for control.
Basically the block you attach to the cpu has a pump installed this pump head is powered by connecting the sata capable and there s also what looks like a 3 pin female that appears to connect to a fan header the pump is also connected to your motherboard by an internal usb connection the pump head also has two places where you can.