To: ggersh who wrote (61282 ) 4/3/2018 6:00:51 AM From: maceng2 Read Replies (1) | Respond to of 71456 Manufacturing. Here is reality. My new server cabinet has 4 x 600 watt power supplies going into it to it. I have 4 x 120mm fans at the back pulling air out at about 75 cfm each. I run them from a voltage controlled supply at about 40 cfm normally. If the temperature of the cabinet goes above 28 degrees centigrade full power is applied and they all run at 75 cfm. 300 cfm in total. It all works well, but during the summer months, if all four servers are running at full whack, it isn't going to be enough and I don't like processors running hot. I have to double the cooling airflow again approximately. Guess what. I am not going to ask an IT company to deliver me the £1000+ solution. Part of the plan is to seal the server cabinet better so that all the air flow is pulled through the server cases. I really don't like the internal massed array of silly little 40mm fans going up to full blast as they are noisy as jet engines. Really ! There was a corporate mindset 20+ years ago that dictated that all 1u IT units should use 40mm fans. They are noisy as f**k and expensive. On my Cisco router and switch cabinet I custom built, have derated the 40 mm fans so they hardly make a whisper and use four 90mm fans in the cabinet to pull through filtered air depending on cabinet temperature. Rather then faff around with another 4 x 120mm fans for the server unit I cast about looking for something much bigger. Domestic 240 volt solutions are available but electrical safety is a consideration. I have to be ready for any change of scale. So, after one thing and another I settled on a £28 solution which is a 200mm (8 inch) 12 volt fan pulling air out from the bottom of the server cabinet in a duct. Standard domestic air conditioning ducting can be used which adds another £10 and I already have all the parts. I ordered the 200mm fan from a company in Wales in early January. It only arrived today because of a back order and processing issue. The delivery problem was not China. See is a picture below. As you can see, it's a marvellous piece of manufacturing. It's life is 40,000 hrs, noise 37.25 dba, and 166 cfm, consumes about 5 watts of power so ..ok.. I might/might not need two of them. The point is printed at the bottom of the packaging."Designed in Los Angles, California. Made in China." and do not underestimate Chinese designers. He could well have come from China originally... or anywhere else in the world including Mexico. -g- Fact is China make an awful lot of stuff, for all companies in the world. BMW sub contracts to China, and they are not the only ones. youtube.com Maybe Tesla and and Elon Musk need to watch this video. youtube.com I am retired now from manufacturing. I can tell you it would be a distinct pleasure to work along side any of those guys in those videos. They are all speaking from the heart, doing the job they like, and there is not any bs getting in their way. To make good stuff, bs has to be minimised. Currently that ain't happening in most places the US of A or the UK.