J.D Posted October 15, 2004 Posted October 15, 2004 I have all of my components in a cabinet that I have cut a grill out at the top and also some slats under the doors. The cabinet is MDF all around with no other ventilation. I have also cut some of the back of each shelf to enable cabling and some ventilation. I would like to stick a fan under the top grill (240v) to exhaust some of the hot air as it still seems to get pretty warm in there. I went to Jaycar and Radio parts and all their 240v fans were too loud and high speed. I just need anything between 10-20cfm with db under 20. Does anyone have any suggestions as I am sure other people have already encountered this problem?
Spearmint Posted October 15, 2004 Posted October 15, 2004 Does anyone have any suggestions as I am sure other people have already encountered this problem? I use 12v fans hooked up to variable voltage power pack, and run them at 6v, another way is to connect a couple in series and run them at 12v, or put a resistor in series. Much easier to play with LV fans than mains operated ones. Dick
ijuschill Posted October 22, 2004 Posted October 22, 2004 Dicksmith sell 12cm 240v ball bearing fans for about $30-40, very quiet and powerful. You just need to get a some power cable, an adaptor to connect to the fan and a on/off switch as they only sell the fan in a box. Justin
laurie Posted October 22, 2004 Posted October 22, 2004 JD Are you sucking hot air out or blowing air in ?....because if your blowing air IN you should have a filter on the fan especially if there are smokers around! and as Justin suggested ball bearings are the way to go don't touch the cheap & nasty brushless type they will size up in no time.. cheers laurie
John_Barber Posted October 22, 2004 Posted October 22, 2004 Dicksmith sell 12cm 240v ball bearing fans for about $30-40, very quiet and powerful. I had a 240 V 12 cm fan, (cannot remember if it was a DSE). Cut a hole in the back of the cabinet, wired up to the switched power out of the back of the amp and switched it all on. Voila!, a Harrier Jump Jet in the living room! JB
laurie Posted October 22, 2004 Posted October 22, 2004 If you really want to be smart you could use the control circuit that a lot of equipement have e.g dropping screen down for pj ect to operate a relay to turn the fan on/off cheers laurie
JasonBB Posted October 23, 2004 Posted October 23, 2004 I found that when I fitted any fan (I tried 3) to the cabinet it created noise, I brought the last one from DSE and wired it up to a switch, in the end I just sat the fan on top of the media box to keep it cool, it was much quieter than fixed.
J.D Posted October 24, 2004 Author Posted October 24, 2004 thanks for all the suggestions. It seems that nothing is straight forward. I am using the fan to exhaust the air. I think I might look into Spearmints suggestion as all the 240v fans show specs that are really noisy. I am looking for "whisper quiet". Truthfully, for what I need, if only I could find a little 240v square desk fan and mount it underneath (they are weak but very quiet). Jaycar had one but it was square or able to be mounted so I had to pass.
byron1503559589 Posted October 25, 2004 Posted October 25, 2004 thanks for all the suggestions. It seems that nothing is straight forward. I am using the fan to exhaust the air. I think I might look into Spearmints suggestion as all the 240v fans show specs that are really noisy. I am looking for "whisper quiet". Truthfully, for what I need, if only I could find a little 240v square desk fan and mount it underneath (they are weak but very quiet). Jaycar had one but it was square or able to be mounted so I had to pass. <{POST_SNAPBACK}> Some ideas, and you may need more than one since to be quiet they don't flow a lot of air. Thermaltake SilentCat 9cm fan w/multidirectional intake, 8->9cm adapter and 3-pin connector, quiet 2.16W, 21dbA 52CFM Thermaltake 90mm Smart II case fan w/3-wire plug, 1300-4500RPM, 25-45dBA, 25mm thick There are other quiet case fans made for computers! B
Carrera1963 Posted October 26, 2004 Posted October 26, 2004 I agree with the last post - PC case fans are best. Don't buy the generic (DSE) 12v fans or any 240v jet-like models I'm using a 120mm Vantec Stealth 12v fan ($20) in my coffee-table/hushbox, running at 7.5V from a multi-voltage plugpack ($15). Almost silent and moves a lot of air.
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