What is a case fan?

Welcome Delta Sigma Pi

  • Accessibility
  • Sales:

    Home:

    1-800-426-7235

    Business:

    1-866-426-0911

    Chat Now >

    Visit Sales Support Page >


    Order Support:

    Order Lookup >

    Visit Order Support Page >

    Technical Support >

Lenovo
All
  • All
  • Laptops
  • Desktops
  • Workstations
  • Monitors
  • PC Accessories & Electronics
  • Tablets
  • Servers & Storage
  • Servers Accessories
  • Sign In / Create Account
    My Lenovo Account
    Keep track of your wishlist, orders, and rewards all in one place
    Sign In / Create Account
    Welcome Back!
    Access your order, subscriptions, saved carts, rewards balance, and profile
    View My Account
    Orders
    View & track your orders
    Rewards
    Earn & redeem Rewards
    Profile
    Edit name, password, and account settings
    Wishlist
    Manage a wishlist of your favorite products
    Products
    Manage your devices, accessories
    Product Registration
    Register your product and/or update your warranty dates
    Sign Out
  • My Lenovo Rewards
  • Cart
  • Products
  • Solutions
  • Services
  • Support
  • About Lenovo
  • Deals
  • Student
  • Gaming
  • Laptops
  • Desktops
  • Workstations
  • Accessories
  • Software
  • Monitors
  • Tablets
  • Servers & Storage
  • Home & Office
  • AI
  • Deals
TEMPORARILY UNAVAILABLE
DISCONTINUED
Temporary Unavailable
Cooming Soon!
. Additional units will be charged at the non-eCoupon price. Purchase additional now
We're sorry, the maximum quantity you are able to buy at this amazing eCoupon price is
Sign in or Create an Account to Save Your Cart!
Sign in or Create an Account to Join Rewards
View Cart
Remove
Your cart is empty! Don’t miss out on the latest products and savings — find your next favorite laptop, PC, or accessory today.
item(s) in cart
Some items in your cart are no longer available. Please visit cart for more details.
has been deleted
Please review your cart as items have changed.
of
Contains Add-ons
Subtotal
Proceed to Checkout
Yes
No
Popular Searches
What are you looking for today ?
Trending
Recent Searches
Items
All
Cancel
Top Suggestions
View All >
Starting at
  • Labor Day! Celebrate hard work with limited-time Doorbusters + Buy more, Save more! Shop Now >

  • My Lenovo Rewards! Earn 3%-9% in rewards and get free expedited delivery on select products. Join for Free >

  • Lease-to-own today with Katapult. Get started with an initial lease payment as low as $1! *** Learn More >

  • Buy online, pick up select products at Best Buy. Shop Pick Up >

Home > Glossary > What is a case fan?
Glossary Hero
Learn More
StarStar

Annual Sale

Lenovo Laptop SaleLenovo Laptop Sale

Laptop Deals

Desktop DealsDesktop Deals

Desktop Deals

Workstation DealsWorkstation Deals

Workstation Deals

StoreStore

Pick Up Today at Best Buy

ControllerController

Gaming PC & Accessory Deals

MouseMouse

PC Accessories & Electronics Deals

MonitorMonitor

Monitor Deals

Tablet and phoneTablet and phone

Tablets & Phones Deals

ServerServer

Server & Storage Deals

Discount tagDiscount tag

Clearance Sale


What is a case fan?

A case fan is a small electrical part installed inside a computer case to support optimal temperatures by circulating air. It draws cool air from outside and expels warm air generated by components like the central processing unit (CPU) and graphics processing unit (GPU). Without it, internal temperatures can rise, leading to reduced performance and potential hardware damage. Case fans come in various sizes and designs, offering different airflow rates and noise levels to suit different cooling requirements and preferences.

Why do I need a case fan?

You need a case fan to support optimal operating temperatures for your computer's components. Without proper cooling, heat generated by the central processing unit (CPU), graphics processing unit (GPU), and other hardware can accumulate inside the case, leading to performance degradation, system instability, and potentially permanent damage to your components. A case fan helps dissipate this heat by circulating cool air into the case and expelling warm air, ensuring that your computer runs smoothly and reliably for extended periods.

How does a case fan work?

A case fan works by creating airflow within the computer case. It draws cooler air from outside the case, directing it to overheat-generating components like the central processing unit (CPU) and graphics processing unit (GPU). The warm air inside the case is then expelled, helping to keep a balanced temperature.

Can I install multiple case fans?

Yes, you can install multiple case fans in your computer to enhance airflow and cooling efficiency by dissipating heat effectively. Ensure your case supports the fans with enough mounting points and power connectors. Proper fan placement, such as having intake fans at the front and exhaust fans at the rear or top to maximize cooling performance.

Does the size of the case fan matter?

Yes, the size of the case fan matters for cooling efficiency and noise levels in your computer. Larger fans (e.g., 120mm or 140mm) can move more air at lower speeds, providing better cooling while producing less noise. Smaller fans (e.g., 80mm) need to spin faster to achieve similar airflow, often resulting in higher noise levels. Choosing the right size depends on your case design, cooling requirements, and noise tolerance, ensuring best performance and a quieter computing experience.

When should I replace my case fan?

You should replace your case fan when it starts making unusual noises, such as grinding or clicking, which show bearing issues. Also, if you notice decreased airflow or your system is overheating more often, it’s a sign the fan is not functioning efficiently. Physical damage, excessive dust accumulation, and a noticeable drop in performance over time are other indicators. Regular maintenance checks can help you find when a replacement is necessary to ensure the best cooling and system performance.

What factors should I consider when choosing a case fan?

When choosing a case fan, consider factors like size, airflow, static pressure, noise level, and compatibility. Opt for a size that fits your case and allows for adequate airflow. Look for fans with high airflow and static pressure ratings to ensure efficient cooling, especially if you have restrictive components like radiators. Additionally, prioritize fans with low noise levels if noise is a concern. Ensure compatibility with your case and motherboard to avoid installation issues.

Can I control the speed of my case fan?

Yes, you can control the speed of your case fan. Many modern motherboards offer fan control features, allowing you to adjust fan speeds based on temperature fluctuations. This can be done through the basic input/output system/ unified extensible firmware interface (BIOS/UEFI) settings or using software provided with the motherboard. Additionally, standalone fan controllers are available, offering manual control over fan speeds. Controlling fan speeds enables you to balance cooling performance with noise levels, tailoring your system's airflow to your specific preferences and requirements.

What are PWM case fans?

PWM (Pulse Width Modulation) case fans are cooling fans for computer cases that use Pulse Width Modulation (PWM) to control their speed. Unlike traditional fans that run at a constant speed, PWM fans adjust their speed based on the temperature of the system. A PWM signal is sent to the fan, allowing it to run faster or slower as needed. This results in more efficient cooling, reduced noise, and better overall performance, making PWM fans a popular choice for keeping optimal computer temperatures.

Does the direction of the case fan matter?

Yes, the direction of the case fan matters significantly. Proper airflow management is essential for effective cooling. Typically, you want fans to intake cool air from the front or bottom of the case and exhaust warm air from the rear or top. This directional airflow helps prevent hotspots and ensures that components receive adequate cooling. Incorrect fan orientation can lead to inefficient cooling, higher temperatures, and potentially reduced system performance or hardware damage.

Could I use case fans for liquid cooling systems?

Yes, case fans are commonly employed in liquid cooling setups to enhance overall cooling efficiency. They help dissipate heat from radiators by pulling cool air through them or pushing warm air out, contributing to the effective heat exchange process. Proper airflow management is crucial for maximizing the performance of liquid cooling systems, and case fans play a vital role in keeping optimal temperatures for components like the central processing unit (CPU) and graphics processing unit (GPU).

Can I use case fans to improve airflow in other electronic devices?

Yes, you can use case fans to enhance airflow in various electronic devices beyond computers. Devices such as gaming consoles, network switches, routers, and home entertainment systems can receive help from improved airflow to prevent overheating and keep best performance. Installing case fans strategically can help dissipate heat generated by internal components, ensuring reliable operation and prolonging the lifespan of electronic devices.

What are some tips for maximizing the effectiveness of case fans?

To maximize the effectiveness of your case fans, ensure they're clean and free from dust buildup, optimize their placement for optimal airflow, use quality fans with high airflow and static pressure ratings, and consider using fan control features to adjust their speed based on temperature changes. Additionally, managing cable clutter inside your case and ensuring proper ventilation around your components can further enhance cooling efficiency. Regular maintenance and monitoring of fan performance are also essential for long-term effectiveness.

Can I use case fans with RGB lighting?

Yes, you can enhance the aesthetics of your computer setup by using case fans equipped with RGB lighting. These fans come in various sizes and designs, which allow you to customize the look of your PC with vibrant colors and lighting effects. Many RGB case fans come with software or controllers that enable you to adjust the colors, brightness, and effects according to your preferences, adding a visually appealing touch to your gaming or workstation build.

Would adding more case fans increase power consumption?

Yes, adding more case fans will increase power consumption, albeit marginally. Each added fan draws power from the motherboard or power supply unit, contributing to the overall energy usage of your system. However, the impact on total power consumption is typically minimal compared to other components like the central processing unit (CPU) or graphics processing unit (GPU). Still, it's essential to consider power requirements when adding multiple fans, especially in systems with limited power capacity or efficiency concerns.

Looking for a Great Deal?
Shop Lenovo.com for great deals on A+ Education PCs, Accessories, Bundles and more.
Shop Deals Now

  • ThinkPad X9 15 Aura Edition (15ʺ Intel) Laptop
    Starting at
    $1,127.97
    Learn More
  • Yoga Book 9i (13” Intel)
    Starting at
    $1,999.99
    Learn More
  • Legion 5i Gen 9 (16″ Intel) Gaming Laptop
    Starting at
    $1,560.48
    Learn More
  • Yoga 9i 2-in-1 Aura Edition (14″ Intel) Laptop
    Starting at
    $1,396.49
    Learn More
  • IdeaPad Pro 5 (16” AMD) Laptop
    Starting at
    $705.59
    Learn More
  • Shop
    • Student Deals
    • K-12 Student Laptops
    • Student Accessories
    • Laptops by Major
    Education resource
    Explore
    • What is STEM?
    • Best Laptops for College
    • Student & Teacher Discounts
    • Lenovo Sustainability Programs
    Education carry case

    Stem Articles
    See All STEM Articles
    • Online STEM Education

    • STEM Career Tips & Resources

    • Women in STEM

    • STEM Educator Training

    • STEM Grants & Funding

    • STEM Education: Coding for Kids

    • STEM Education: Robotics

    • STEM Education: Biotechnology

    • STEM Education: Sustainability

    • STEM Education: AI & ML

    While every effort has been made to ensure accuracy, this glossary is provided for reference purposes only and may contain errors or inaccuracies. It serves as a general resource for understanding commonly used terms and concepts. For precise information or assistance regarding our products, we recommend visiting our dedicated support site, where our team is readily available to address any questions or concerns you may have.

    Why Lenovo?

    Go Greener with Leno...

    Lenovo is committed to Smarter Climate Action with lower energy laptops, use of sustainable materials and packaging, and available CO2 Offset Services.
    Learn More
    pastel background

    Get It Now, Pay For ...

    Lenovo has multiple financing option: the Lenovo Credit Card, installment plans, and lease-to-own financing op...
    Learn More
    pastel background

    Productivity & Peace of Mind

    Stay productive with Premium Care Plus - 24/7 priority support and coverage against accidental damage. Power through your day with our Smart Performance and extended battery solutions.
    Learn More
    pastel background

    Fast & Secure

    Get the most from your laptop with Lenovo’s state-of-the-art Smart Performance, delivering powerful, all-in-on...
    Learn More
    pastel background

    Assistance and Suppo...

    Chat with a trained professional who can help you find the right products, place or check on an order, or setup your Education laptop.
    Contact Us
    pastel background
    Enter email to receive Lenovo marketing and promotional emails. Review our Privacy Statement for more details.
    Please enter the correct email address!
    Email address is required
    • Facebook
    • Twitter
    • Youtube
    • Pinterest
    • TikTok
    • Instagram
    Select Country / Region:
    Country
    AndroidIOS

    About Lenovo

    • Our Company
    • News
    • Investors Relations
    • Compliance
    • ESG
    • Product Recycling
    • Product Recalls
    • Executive Briefing Center
    • Lenovo Cares
    • Careers
    • Formula 1 Partnership

    Products & Services

    • Laptops & Ultrabooks
    • Smarter AI for You
    • Desktop Computers
    • Workstations
    • Gaming
    • Tablets
    • Servers, Storage, & Networking
    • Accessories & Software
    • Services & Warranty
    • Product FAQs
    • Outlet
    • Deals
    • Lenovo Coupons
    • Cloud Security Software
    • Windows 11 Upgrade

    Resources

    • Legion Gaming Community
    • Lenovo Creator Community
    • Lenovo Pro Community
    • Lenovo Pro for Business
    • My Lenovo Rewards
    • Lenovo Financing
    • Affiliate Program
    • Affinity Program
    • Employee Purchase Program
    • Lenovo Partner Hub
    • Laptop Buying Guide
    • Where to Buy
    • Glossary
    • Server Buying Guide

    Customer Support

    • Contact Us
    • Policy FAQs
    • Return Policy
    • Shipping Information
    • Order Lookup
    • Register a Product
    • Replacement Parts
    • Technical Support
    • Forums
    • Provide Feedback
    © 2025 Lenovo. All rights reserved.
    PrivacyCookie Consent ToolSite MapTerms of UseExternal Submission PolicySales terms and conditionsAnti-Slavery and Human Trafficking Statement
    Compare  ()
    x
    Call

    Need Help? Call: 

    1-800-426-7235
    Select Your Store
    Add items to your cart?
    We've noticed that you've entered a different store. Do you want to add these items to your cart in this Store?
    No Yes.Add in Public Store
    Add items to your Lenovo Pro Store?
    We've noticed that you've entered a different store. Do you want to add these items to your cart in Lenovo Pro Store?
    No Yes.Add items in Lenovo Pro store.
    Add items to your Affinity Store?
    We've noticed that you've entered a different store. Do you want to add these items to your cart in Affinity Store?
    No Yes.Add items in Affinity store.
    Add items to your Education Store?
    We've noticed that you've entered a different store. Do you want to add these items to your cart in Education Store?
    No Yes.Add items in Education store.

    close_icon

    Sign up and receive up to $100
    off your next purchase.
    Click here for offer details
    Are you shopping for a business?

    No, Thanks

    Click here for offer details
    *Offer valid for new subscribers only. Not valid on previous purchases.
    Lenovo Privacy Policy
    Thanks for signing up!
    You should receive an email from us within the next 2 hours
    *Offer valid for new subscribers only. Not valid on previous purchases.
    Lenovo Privacy Policy
    An error occurred while submitting your request.
    Please try again later.