The Raise3d N1 printer seems to come pre-drilled for both 35mm (factory) and 40mm extruder fans. This is great, because it lets you bolt a Noctua A4 x 10 FLX 12v fan right to it. These fans are quieter, yet move similar quantities of air (more?) compared to the original fan on account of being slightly larger.
This fan box design is just a copy of Raise's 35mm box. Figure out how to plug it into the print head control board and the rest should bolt on. You might need to make a trip to the hardware store for some 3mm screws, possibly washers too.