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Optimum airflow, air pressure & extremely silent performance
Innovative blade design focus air flow & optimum cooling efficiency (Patent)
Reduce the vibrations efficiently & silent operation
Air-inlet with optimal aero-dynamical design reducing noisy air turbulences
Oil surface tension and hydrodynamic pumping forces provided by grooves, no friction, extremely quiet
We defined HDB to Hydro Dynamic Bearing. An oil seal design that has a higher reliability and advantage than conventional fan motor design.
1. High revolution precision, low vibration noise
2. Fluid seal design provide extremely long life span
3. Surface tension effect, runs more smoothly with no friction, extremely quiet
Fluid seal design is achieved through the use of oil surface tension and hydrodynamic pumping forces provided by grooves. Bend area is centralized oil and prevented oil leakage out of motor (oil leakage is main problem of sleeve bearing, short life time) . Friction between shaft and HDB will be down due to herringbone structure reaction(friction between the metal is disadvantage of ball bearing, noise & waste heat problem). So HDB conquer sleeve & ball bearing disadvantage to become more reliable & quiet technology for Top-notch fan. Such design concept is successful and applicative on HDD, and we can see a reliability application in it.
HDB, Ball, & Sleeve comparison
Sleeve | Ball | Hydro-Dynamic | |
---|---|---|---|
revolution precision | mediocre | good | best |
vibration noise | mediocre | loud | quiet |
life span (hrs) | 30,000 | 50,000 | >150,000 |
waste heat | high | high | low |
Cost | low | high | high |
Model | CF-V14HB | |
---|---|---|
Marketing name | VORTEX HDB 140 | |
Dimensions | 140 x 140 x 25 | |
Speed | 1200rpm | 700rpm(w/ adapter) |
Air flow @ 12V (CFM, m3/h) | 70.5 / 119.8 | 55.5 / 94.3 |
Air pressure @ 12V (mm H2O) | 1.38 | 0.74 |
Noise | 19.2dB | 16.4dB |
Bearing type | HDB (Hydro-Dynamic Bearing) | |
Connector | 3pin | |
Cable length | 450mm | |
Cable sleeve | Yes | |
Accessories | 3 to 4pin adapter | |
Fan speed adjustable cable | ||
Tool-less fixed pins | ||
Carton | Color box with PVC window | |
Lifetime L10 (hours / 25°C) | 300000 |
Pros: Very good build quality, also very silent even when running at max rated RPM. The included inline resistor isn't even needed in my opinion.
Cons: Vibration. When mounted so the motor mount was facing upward (blowing air up), the fan vibrated quite noticeably, loudly at times. Even with the rubber pull-pins, it still made a lot of vibrating noise. I put a penny on the top of the case and it was sliding around that's how much vibration there was. However this isn't a fault of this particular manufacturer but rather the bearing type. Not sure if all fluid bearings are subject to this or not. The problem is the shaft that the actual fan blades are attached to is essentially floating, and having it facing down puts a lot of strain on the retention mechanism inside the motor/bearing housing. Any other orientation is perfectly fine as they don't make a bit of vibrating when mounted vertically, or even horizontally blowing air down (tho I don't know why you'd ever mount them like that). Bottom line: If you're looking into these fans as an option for top-mounted exhaust, keep looking. These fans do not serve that purpose.