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The extended opinion is that increase in the fan diameter allow to reduce the rotation speed and noise level without damage for the cooling efficiency. But in some situations it does not work - for example, power units producers considers that one 80 mm fan on the rear wall cools better the interior of power unit than 120 mm fan on the lower wall.
Another direction of fans performance increase - this is increase in their depth. The majorities of fans have 25 mm depth , and some fans has 38 mm depth . Large surface area allow to pumps more air . If the noise reduction is priority, then it is possible to lower the fan rotation speed .
Scythe company presented recently a new fan series : ultra kaze 120mm, which have the standard size 120x120x38 mm. three models are characterized by their performance and noise level .



Let us examine the fundamental characteristics of the new fans scythe:
- DFS123812L-1000 - > 19.81 DB/44.44 cu. feet/min/12 v/0.25 A/1000 r/min;
- DFS123812L-2000 - > 32.91 DB/87.63 cu. feet/min/12 v/0.25 A/2000 r/min;
- DFS123812H-3000 - > 45.90 DB/133.60 cu. feet/min/12 v/0.60 A/3000 r/min.
The amateurs of silence will be pleased with model with rotation speed 1000 r/min, and the supporters of extreme air cooling will prefer model with rotation speed 3000 rp/min .
Fans are equipped with slide bearing with calculated work time 30 000 hours. The recommended price of scythe ultra kaze 120mm fans in European retail is equal to 9 Euro.
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