🎯 Why It Matters
Bearing type is the #1 determinant of fan lifetime. Sleeve bearings cost less but wear faster and are orientation-sensitive. Ball bearings last 2-3× longer and work in any orientation. For 24/7 operation or high-temperature environments, dual ball bearings are mandatory.
📐 How to Read
L10 life = hours until 10% of a batch fail. Sleeve: 30,000-50,000 hrs at 40°C. Ball: 50,000-70,000 hrs. Dual ball: 70,000-100,000+ hrs. Temperature dramatically affects life — every 10°C above rating roughly halves bearing life.
📏 Typical Values
Consumer/office: Sleeve bearing (cost-optimal). Industrial 24/7: Dual ball bearing. High-temperature: Ball or dual ball. Ultra-quiet: Hydraulic/MagLev. Outdoor/harsh: Sealed ball bearing.
🔗 Related Parameters
Lifetime, Noise, Operating Temperature, MTBF
❓ Frequently Asked Questions
Sleeve vs Ball — which lasts longer?
Ball bearings last 2-3× longer than sleeve. At 40°C: sleeve ~40,000 hrs, ball ~70,000 hrs, dual ball ~100,000 hrs. At 60°C these numbers roughly halve.
Can I mount a sleeve bearing fan horizontally?
It depends. Most sleeve bearing fans work best in vertical orientation (shaft horizontal). Horizontal mounting (shaft vertical) can cause uneven oil distribution and early failure. Ball bearing fans work in any orientation.
My fan is getting louder — bearing failure?
Yes, increasing noise (especially grinding or clicking) signals bearing wear. Sleeve bearings get louder gradually. Ball bearings may fail suddenly. Replace the fan before it seizes completely.