The 40mm x 20mm fan 24v can be used to replace a broken hotend cooling fan for 3d printer, fit for Ender 3 / Ender 3 Max Neo / Ender 3 Pro / Ender 3 v2 / Ender 5 pro, etc. 40x20mm fan helps a lot with its cooling abilities, help you achieves a high level of print quality.

20mm thickened frame PBT plastic construction, mini 4020 fan ideal for 1U applications or replacing fans in network and storage equipment (routers, switches, NAS etc.) or other devices such as DVRs, air purifier, control board, stepper drivers; or any DIY cooling and narrow place.

The steps to exchange wires position: a. Using pointed tweezers or another sharp, hard tool, press down on the metal pin of the red wire, then pull out the red wire b. Take out the black wire in the same way c. Then put the red and black wires into the correct position according to your needs.

Wear resistant hydraulic bearing sealed oil retention design effectively prevents the volatilization of lubricating grease and dust from entering the inside of the bearing makes the fan run more quiet and stable with an astounding service life of 40,000 hours.

Includes two 40mm x 40mm x 20mm 2pin 24v dc cooling fan, a 1 meter (3.3 feet) 2-pin exxtension cable wire, mounting screws and nuts; perfect for tight spaces and small applications. with 1 meter long extension cable is enough for you to use on your 3D printer, very convenient.