With the Noctua NF A20-HS Chromax, Watercool, in collaboration with Noctua, offers probably the most powerful 200mm silent fan for our MO-RA3 radiators. Noctua's NF-A20 has received numerous awards and recommendations from international hardware websites and magazines and has established itself as a reference for premium quality 200mm fans.?The HS-PWM (High-Speed-PWM) version, available exclusively via Watercool.de, offers, in addition to the attractive, completely black chromax.black design, an increased speed of 1200rpm, which is over 40% higher than the regular PWM version with 800rpm Delivery capacity and over 90% more static pressure. 154mm, 110x180mm and 170mm hole spacing In order to enable the broadest possible compatibility with today's PC cases, the NF-A20 has three different hole spacings: While the 154x154mm and 110x180mm dimensions enable the replacement of most common 200mm fans, the 170x170mm dimension is used for many 230 and 250mm fans, which can also be replaced by the NF-A20.* Technical data: Dimensions: 200 x 200 x 30 mm (W x H x D) Material: plastic, black Volume: approx. 10.7 - 31.6 depending on speed Speed : ~500 - ~1200 rpm Delivery volume: approx. 212, 3 m?/h Air pressure: 2.07 mmH2O Voltage: 12 V Connection: 4-pin PWM Life expectancy: 150,000 h Power consumption: 1.92W Manufacturer's warranty: 6 years *As there is no binding industry standard for the size and hole spacing of 200mm, 220mm, 230mm or 250mm fans, please consult Noctua's case compatibility list and carefully check your case's hole spacing and available space (the NF-A20 is 30mm deep, whereas some other 200mm fans are only 20mm deep!) to make sure the NF-A20 is compatible with your case.?If in doubt, please contact your housing manufacturer.