| Author |
Message |
retro-rick
Joined: 05 Aug 2011
Posts: 22
|
| Posted: Wed Oct 05, 2011 7:32 pm Post subject: ultra silent fans |
|
|
|
Are the high end ultra quiet fans a good idea? What CFM Should I look for?
|
|
| Back to top |
|
 |
HK-Steve
Joined: 15 Jul 2006
Posts: 849
Location: Switzerland
TV/Projector: Marquee 9500, Epson 8100
|
| Posted: Wed Oct 05, 2011 7:38 pm Post subject: |
|
|
same as original, otherwise, overheating problems may start.
cheers
_________________
|
|
| Back to top |
|
|
retro-rick
Joined: 05 Aug 2011
Posts: 22
|
| Posted: Wed Oct 05, 2011 9:04 pm Post subject: |
|
|
|
that is why I was looking for recommended CFM ratings. I admit all depends on projector and set up. My projector is suspended 3 feet from the ceiling. Air flow is spectacular. Steve, I thank you for your guidance. I will do more research into the stock fans.
|
|
| Back to top |
|
|
kal
Forum Administrator
Joined: 06 Mar 2006
Posts: 18114
Location: Ottawa, Canada
TV/Projector: JVC DLA-NZ7
|
| Posted: Wed Oct 05, 2011 10:23 pm Post subject: |
|
|
CFM only tells half the story. It's how much air they move without any resistance (ie: out in the open).
Many fans have close to no air movement once you add resistance (ie: pushing air around something).
STATIC PRESSURE is the important thing to look for.
I tried once to replace all my fans with "ultra-quiet" ones and the projector temp went up quite a bit. Search this forum for "SilentX" fans.
The other issue is that a lot of the noise is not from the fans themselves but from air turbulance. So changing the fan does nothing. If it does, it's because of the point above: The fan is no longer able to move as much air.
Moral of the story: Keep the original fans and instead build a hushbox.
Kal
_________________
Support our site by using our affiliate links. We thank you!
My basement/HT/bar/brewery build 2.0
|
|
| Back to top |
|
|
retro-rick
Joined: 05 Aug 2011
Posts: 22
|
| Posted: Wed Oct 05, 2011 10:59 pm Post subject: |
|
|
This is why I respect this forum. in the years I have been lurking around, I have found the cilility on this forum second to none.
A hush box is out of the question. at least for now...
Thanks again
|
|
| Back to top |
|
|
garyfritz
Joined: 08 Apr 2006
Posts: 12088
Location: Fort Collins, CO
|
| Posted: Wed Oct 05, 2011 11:19 pm Post subject: |
|
|
Then if you still want to look at replacing fans, pay VERY close heed to Kal's warning. CFM is typically quoted with zero resistance, i.e. zero static pressure. In order to cool your projector the fans have to push air through the case, and that has a fair amount of static pressure. Different fans respond to static pressure differently; one fan's airflow might drop by 20% with X units of static pressure, while another fan with identical CFM rating might drop 50% or more.
The only way to know how a fan performs is to look at the airflow chart for the fan. It shows the flow in CFM for a range of static pressures. That will give you an idea if your fan can do the job, or if it will respond to your PJ's static pressure with a drastically reduced airflow -- which might cook your projector.
|
|
| Back to top |
|
|
wallace123456
Joined: 14 Aug 2006
Posts: 2236
Location: Northwest VA area
|
| Posted: Wed Oct 05, 2011 11:49 pm Post subject: |
|
|
Another question would be: What type projector would you be changing the fans in?
Some folks have come up with complete redesigning of the fan and air flow which reduced the noise factor, but still kept (if not improved) the projectors "safe" operating temps zones.
wallace
_________________
Life Is Good, But BBQ Is Better! BBQ Competition Team
|
|
| Back to top |
|
|
|
|
