Damn, I have 2 of them on the way. I purposely got them because I thought they'd be quieter. I'll try them anyhow I guess. Hopefully having 2 would keep it cool enough, but sounds like it'll be loud.

Anyone have any tips on damping the sound on these? Maybe some good material to use as a gasket?

What exactly do you mean it flopped? Are you certain you wired it correctly? Did you have a 120v ac to 12v dc adapter, or something like a power supply?

Hmm... flopped... exactly what I said-- it was louder and hotter. I solder-wired it to a wall-wart 12v adapter. I measured the volts-- 12.46 on my digital readout. I got the positive and negative correct-- they were nicely labeled. The fan came on. It made a nice noise. The blade went around and around. The little attenuator knob made it go faster and slower. It did everything a fan should do except keep the box cooler than 110 degrees. It was taking the inside hot air and blowing it OUTSIDE. Not the reverse. Not sure what more I can say.

Incidentally, a gasket may help with the noise... but at 3000 rpms, you won't be able to get rid of the high whirring sound. I like the other one at 2000 rpms better.

David

I'm currently working on a push-pull solution that involves a 120mm panaflo 86cfm/35db in the back and one or two Everclear PCAC's blowing air into the inlet on top of the box.

The part i'm figuring out is how to filter the PCAC/intake to avoid dust contamination. I'm thinking of building a skeletal frame enclosure for the pcac and wrapping the frame with some dense filter material. I just need to figure out a configuration that'll allow for plenty of intake and minimal dust.

Have you made sure that your box is fairly air-tight in the right places?

As a matter of fact, my box is not the least bit airtight anywhere (you can see light through the cracks where the sides join the top and bottom, etc.) I was wondering whether the results would be better if I completely sealed it up aside from the desired airflow path. Maybe that's the only way to get satisfaction out of it? Still, the box got hotter than it did with another fan rated to less airflow. As noted before, the only other real difference is the Evercool fan was mounted on the left side of the box corner, not the back. In case you're wondering, when I switched the position of the fan, I replaced the back panel with the hole for the old fan with a new wood panel with no hole, so it was not pulling air from there.

David

You need to seal up that air leakage to force the air to go in the right direction. That way, you can be sure that the air will flow correctly. You might also try mounting the PCAC with foam around the enclosure and mount the PCAC upside-down.

You could build a small intake box around your fans. Put a filter at the entrance to the box and make sure it is sealed enough that air can only get in through the filter. Just make sure it's wide enough that the fan's arn't starved for air.

==== filter
|------| air box
-0000- intake fans in PJ lid.

Hi

Just got a silly question.

The evercooler fan (WF12v Evercool PCAC Fan) that everyone seems to be mentioning and is available from lumen lab, isn't this a blower? If so how does it work? I thought you needed to 'suck' the air out the back.

Thanks in advance.

Blowers suck and suckers blow.

... and either way both draw (or swallow) air.

But your right, this fan sucks and exhausts (blows) out air. I read the specs incorrectly.

Hey something I just tried for the hell of it you guys might want to check it out. Was looking at the new thermaltake silent fan design and thought, my dremel can do that so I cut the shroud off the fan except for the bottom 1/4 inch. The difference is amazing it's so much quieter and the airflow seems same or better. Now this may reduce the pressure it can push but seeing as they can't handle pressure anyway it shouldnt be too big of a deal. I did try this on one of my 80mm fans that was just kickin around but I can't see why it wouldnt work on a 120mm(don't want to sacrifice my 120mm blue $30 fan) . It's common knowledge that most of the noise from a fan comes from the tips of the fan so close to the shroud. Of course if anyone tries this on the fan in the box I'd watch my fingers while tinkering heh heh

I have found exactly the same result with the PCACs. I am using Haas's design to boot, too!! I just don't think they're best for our application, IMO.

I'm going with 2x evercool PCAC's on the rear just to reduce the light pollution. The black shroud looks like it will do a nice job in absorbing light.

...as for the inlet, I wasn't going to use anything... but if that doesn't cut it, I'll have to devise some sort of Ram Air solution. It'll most likely look like the scoop from a hot rod.

I haven't got my projector completed yet, but I have been using the PCAC since day one and have already logged 5 straight hours running the projector with one PCAC and have had no problems. Temp on the LCD is steady at 80 degrees and no problems with other areas yet.

Has anyone used this fan?

http://www.frozencpu.com/fan-22.html

I've heard that it's really really loud. Should blow/suck the chrome off a Chevy, though.

Maybe if you coupled it with a POT from an old stereo or something, you could adjust it to suit your needs.

Just wondering if anyone has looked at this as an easy (maybe a bit more costly) approach to controlling the speed (and in turn the sound) of your fans. It allows up to 4 fans and I think 3 or 4 temp sensors. It also ahs warnings etc.. etc.. Any thoughts?

http://www.virtual-hideout.net/reviews/sup...ster_silver.jpg


BTW it is called 'Fan Master' I believe....

anyways I have been searching and think I will combine these items:

1) http://www.maxpoint.com/home/products/perp...fatr2/index.htm

2) 4 of these Fans http://cgi.ebay.com/ws/eBayISAPI.dll?ViewI...046931&tc=photo


Anyone else tried these quiet fans? ~50 CFM should be good If I use 4 of them.

I recently ordered two of these 9" 120V cross blower fans.

http://www.allelectronics.com/cgi-bin/cate...-207&type=store

This site sells all different types of electronics and I find their prices to be good.

Here are all the fans they sell.
http://www.allelectronics.com/cgi-bin/cate...=220&type=store

I also ordered two of these ooooo mama

http://www.allelectronics.com/cgi-bin/cate...-221&type=store

I got all of this plus a couple rheostats for around $60 shipped.

I guess when it comes time for me to build a PJ Ill be prepared in the cooling department!

Does anyone have any experience with the conventional type fan that Lumenlab have in their store?

How does it compare to the evercools?

In my opinion, the evercools are unacceptably annoying with their high pitched whines.

You guys can buy your exspensive fans all you want, but these fans are the only fans that you will ever need. For $10 you can buy ten! free shipping! These are pretty quiet and have pretty good specs, I've bought over a hundred of these, check them out if ya want FANS!

Sorry I disagree. IMO when dealing with 120V in your projector it makes sense to use a 120V Fan, so I went with the Arctic fan, 112 CFM as opposed to your ~35CFM and the need for a separate power supply.

KISS

Ahhhhhh, but you see! They are 10$ for 10, so you can just put like five of them on the projector? eh? eh? Their decently quiet also.

Dude! Great find! That's the same price I was gonna pay for 2 fans at the local computer store.

I'm gonna take advantage of this.

Thanks!

Here's a source I use sometimes. Seems to be a site devoted to liquidating manufacturers overstock.

fans and blowers

It's a good place for picking up cheap power supplies too.

5 of them?? No thanks I'll stick with one. 120 in the box, 120 for the fan. I mean I only paid $8 for it. I can only fathom the quality of those Ahhh whatever works for ya but do factor in the cost of the p/s to run it, methinks they can run $3-15 dollars.

I just got 10 fans for the total cost of $9.90 . That included shipping.

I plan to instll 4 in my next pj and have 6 left over for other projects.

Ok, I jumped on the ten fan deal too. How can you resist? I have a 15 volt power supply from an old SoundBlaster amplifier. It is a 3 amp supply, plenty for all the fans. I wonder what will happen by slightly overdriving these fans 12v->15v? I plugged a few in next to a pair on a 12v power supply. The definitely spin faster. Anyone care to guess how much this will shorten their service life?

Hmmm, not sure how much it would do to it, but for 9.90$ shipped you can get replacements very easily

Check these out, a 92mm fan in an 80mm housing, going to give 2 of these a try.

http://www.frozencpu.com/fan-190.html?id=dgipBtYG

I know this is a little strange but has anyone ever seen this fan? It may be loud as crap, but is states that it blows somewhere about 300 cfm. hey dont shoot the messenger! I am gullable and it does say that.
Anyways just curious.

http://ww.mpja.com/productprint.asp?product=15729+FN

OK fine, im rethinking things. I guess you dont really need something that big.
Strike that last reply unless you need to vent your attic or something.

JimDandy that'd probably be useful for a 1000w set-up some of these crackpots are trying these days, as long as its not too loud.

If anybody is looking for a nice quiet fan that can push alot of air.
Try the Mad Dog Turbo Flow Fan from www.compusa.com
it is 100 cfm uses ball bearings and is very quiet.
I have a commercial projector that has a louder fan.
it is only 12volt but who cares as long as it's quiet and cools everything down properly.
I highly recomend this fan.

How about using 3 of these...QUIET fan!!!

33 cfm,8.7 Db running at 800rpm!!!

would the dB all add up though? it would be <27 dB however, hmmmm.....
expensive also. . . .

As I understand it,the Db rating is not cumulative,3 fans at 8 Db,should be a fraction of one fan at 24 Db.
Which is still very quiet for 100 cfm???

Yes. it should be really quiet, if the specs are correct...

Below is an example of how to add dB ratings together (for fans):

8/10 = 0.8
10^0.8 = 6.31

For two fans:
6.31 + 6.31 = 12.62
log 12.62 = 1.10 (rounded)
10 X 1.10 = 11 dB, an increase of 3 dB*

For three fans:
6.31 + 6.31 + 6.31 = 18.96
log 18.96 = 1.28 (rounded)
10 X l.28 = 12.8, dB an increase of 4.8 dB

* Note: Now the increase of 3 holds true for every addition of two equal dB values. If they're not equal, or if you have more than two noise sources, you will have to do the backwards conversion before you can add them together and then convert them back to dB.

Fulcrum

found an interesting test: "120mm Fan Roundup: 17 Fans Compared"
With soundclip of each at 12,7,5 volts!
also temperature/dB readings and more...
http://www.madshrimps.be/?action=getarticl...708&articID=421

speeder

i highly recomend these fans if you have the space they are near silent you have to put your ear to it to hear any noise!

fan

Thermaltake Silent Wheel 130mm Case Fan

Fan Type Case Fan

Noise Level 16 dBA

Air Flow 54.4 CFM

Static Pressure 1.87 mm/H2O

Bearing Type Sleeve

Voltage 12 V

Power Consumption 3.6 W

Connector(s) 3-Pin Motherboard

Fan Dimensions 130 x 130 x 25 mm

Life Hours 30,000 Hours

How exactly are fan decibels added? I don't understand the math.

How loud would two 14dB fans be and how loud would two 11dB fans be.

I'm either gonna get the
72 CFM @ 14 dBa
or
64 CFM @ 11 dBa

costing about $30
http://www.silenxcanada.com/
either the two silenx iextrema pro case fans at the bottom of the page.

according to the calculations in post #139...

2 x 14 dB fans would be 17dB
2 x 11 dB fans would be 14dB

either way, these look to be very quiet fans..

cheers,
gs

Theres a new fan out. The Noctua NF-S12 120mm. I have 2 of the 1200 rpm.

I've done tons of computer cooling stuff. The Noctua fans are the best fans but they are also the most expensive.

I found these on my travels, I bought 2 for my PJ. I just cant keep the heat out of that box. I'll let you know how it works out.

http://www.pctoys.com/840556021698.html