Is it possible to connect the two 12V fans in series and use them on a 24V circuit?

I don't know why you couldn't. There is another route, a DC-DC converter such as this https://www.amazon.com/LM2596-Converter-3-0-40V-1-5-35V-Supply/dp/B08NV3JCBC/ref=sr_1_10?crid=3C75NN20WP7SA&keywords=dc-dc%2Bconverter&qid=1681221011&sprefix=dc-%2Caps%2C208&sr=8-10&th=1 which would allow you to use 1 or 3 fans.

Would this work as a replacement for the ender 3 v2. the v2 not the original ender 3?

I had them on my v2. They worked for about 2 prints then the poop soldering job form the factory killed the fans. Avoid these.

Do these come with screws? If not, can you tell me what size they need for Ender 3 install?

no, doesn't come with screws. Normal screws are M3

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40mm Blower Fan 24V, Ender 3 Fan Upgrade 24 Volt Fans Blower 4010 Dual Ball Bearing, Works with Ender 3 Pro 3X CR-10S (Pack of 2Pcs)

Product ID: 394057852

Details

Product Dimensions
1.57"L x x
Brand
WINSINN
Power Connector Type
2-Pin
Voltage
24 Volts
Wattage
1.68 watts
Cooling Method
Air

⚡24V power

🌀5400 RPM speed

🔧40mm size

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NZ$58

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Sold byAmazon New ZealandDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🚀 Elevate Your 3D Printing Experience!

EASY INSTALLATION - Comes with all necessary connectors and cables for a hassle-free setup.
VERSATILE COMPATIBILITY - Fits a wide range of 3D printers and small electronic devices.
WHISPER QUIET OPERATION - Enjoy a serene workspace with noise levels at just 31dBA.
LONG LASTING PERFORMANCE - Built to last with a lifespan of 50,000 hours—perfect for continuous use.
UPGRADE YOUR COOLING GAME - Transform your 3D printing experience with enhanced airflow!

The WINSINN 40mm Blower Fan is a high-performance cooling solution designed for 3D printers like the Ender series and CR models. With a dual ball bearing design, it ensures durability and quiet operation, making it ideal for long-term use. Rated at 24V with a maximum speed of 5400 RPM, this fan provides efficient airflow while maintaining low noise levels. Perfect for various applications, it comes with all necessary installation components.

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