[adamharley]

I've got an ELMO HP a305-sq overhead projector, and it's got a loud fan.

It feels like it's pulling air from the inside and blowing it out the side.

It's really really easy to disconnect, but I don't want anything damaged by the hot air sitting around.

What do you guys think? Is it possible to get a compatible quiet replacement? Or would it suffice to slide in a quiet 120mm or two with a separate power supply? When the fan is that loud, it must be doing SOMETHING useful. So what are my options for replacing the original?'

Thanks in advance!

[teamwindsor]

adamharley, on May 18 2008, 07:41 PM, said:

I've got an ELMO HP a305-sq overhead projector, and it's got a loud fan.

It feels like it's pulling air from the inside and blowing it out the side.

It's really really easy to disconnect, but I don't want anything damaged by the hot air sitting around.

What do you guys think? Is it possible to get a compatible quiet replacement? Or would it suffice to slide in a quiet 120mm or two with a separate power supply? When the fan is that loud, it must be doing SOMETHING useful. So what are my options for replacing the original?'

Thanks in advance!

I think the fan in an ohp is more to protect the bulb...this is what i presume anyhow as all the ones i have seen have had the fan directly opposite the halogen. then there are the limited components you have inside...basically the bits to run the light. I see no harm in removing the fan and switching it with an alternative quiter model. The only problem to actually removing the fan entirely being a possible reduction in bulb life.

Mind you with your lcd panel on top some cooling will be supplied to the underside of the stage so keeping down the conducted heat so its prob not adviseable to go without all fans...you do have one to cool the screen right?

[adamharley]

teamwindsor, on May 18 2008, 02:49 PM, said:

I think the fan in an ohp is more to protect the bulb [...] The only problem to actually removing the fan entirely being a possible reduction in bulb life.

That's what I was thinking. The thing is, I don't know if my little quiet fan will be powerful enough to do the same job protecting the bulb as the loud one.

teamwindsor, on May 18 2008, 02:49 PM, said:

Mind you with your lcd panel on top some cooling will be supplied to the underside of the stage so keeping down the conducted heat so its prob not adviseable to go without all fans...you do have one to cool the screen right?

Yes, I have a fan specifically for cooling the lcd.

[Quasi_Mojo]

I would think that the fan was there for a reason. As far as it being as loud as it is, the parts were probably purchased from a low bidder so the quality of the fans are probably not too good. I would think that you can replace them with quieter PC fan(s) using an external power supply.

You might want to consider a combination like the Thermaltake Power Station Mini Box powered by this AC to DC Adapter, 110v AC to 12v DC converter.

Or something similar.

Keep in mind that any heat not removed from the OHP might transfer to the LCD and damage it.

This post has been edited by Quasi_Mojo: 18 May 2008 - 09:15 PM

[eponymous]

Quasi_Mojo, on May 18 2008, 10:14 PM, said:

I would think that the fan was there for a reason. As far as it being as loud as it is, the parts were probably purchased from a low bidder so the quality of the fans are probably not too good. I would think that you can replace them with quieter PC fan(s) using an external power supply.

You might want to consider a combination like the Thermaltake Power Station Mini Box powered by this AC to DC Adapter, 110v AC to 12v DC converter.

Or something similar.

Keep in mind that any heat not removed from the OHP might transfer to the LCD and damage it.

You should remove the fan and look for the brand and model and see if you can find it on the Internet. See if you can see how much CFM it pulls.

I did the same thing and the 230VAC Axial fan that came with the OHP was only pulling 40CFM or so and it was very loud.

I replaced it with a 12VDC Case Fan which pulls 80CFM and is much quiter.

You may want to just buy another 230V/120VAC fan which pulls more air and is quieter.

[knelto]

adamharley, on May 18 2008, 01:41 PM, said:

I've got an ELMO HP a305-sq overhead projector, and it's got a loud fan.

It feels like it's pulling air from the inside and blowing it out the side.

Dude! I actually ran across an ELMO HP-L355S overhead projector last week from a friend of mine! I can attest to the noisy fan but it doesn't bother me. Are you planning on replacing the bulb in the projector? I've been using my Sharp panel on it and it has a really orange/yellow tint to the picture. Mine is kind of just temporary use thing until I build my full one, although it'd be fun to convert this one into something usable.

[expert01]

I would not completely remove the fan. Major fire hazard.

[hoagtech]

I wouldnt remove the fan id fix the fan. if you can take it apart (after you unplug it, of course) then you can remove the dust from the rotor with some wd40 perhaps, and re-oil it with some bearing lubricant or household oil ( the kind that comes in the tin) and it should be quiet as a ghost without sacrificing your bulb life. if its an old ohp you must maintain it!

expert01, on May 19 2008, 05:51 AM, said:

I would not completely remove the fan. Major fire hazard.

[adamharley]

I was never really considering removing the fan altogether. I was only thinking of replacing.

Thanks for the tip on looking up the specs. This is the fan: http://www.nmbtc.com...s/ac4715ms.html

It says 50-102 CFM. Considering the noise, I can assume it's at a steady 100.

I'll try to clean it when I take it out, like you suggested, hoagtech, but I don't know how much good that'll do. The projector is in great condition and everything else is very clean, so I don't see how the fan could have been roughed up. I already tried WD-40, and all that did was make my entire room smell like WD-40.

[adamharley]

Actually, I checked my fan and ath that site (the one linked above) a little more, and checked my fan, and here are the specific specs:

VOLTAGE(V) 115
POWER(W) 10
CURRENT(mA) 140
SPEED(RPM) 2600
NOISE(dBA) 37
PRESSURE(in H20) 0.2
AIRFLOW(CFM) 88

I don't have any 88cfm fans. Most of the ones I already have only go up to 40 or 50. Would it work if I put two fans in this one's place?

[hoagtech]

wow that seems to be misinterpreted alot. dwd40 has been used by rednecks for way too long as a lubricant, even though it is for short term cleaning uses. ive seen bikers put it on their chains, but that is not what it's intended for. try spraying on the rotor of your fan, then use whatever toolos you have to clean it (preferably an air compressor) if not toothbrush. after that you can put oil or grease on it but make sure your wd40 is off. and come on man, make sure your well ventilated. your working with chemicals

adamharley, on May 19 2008, 08:05 AM, said:

I was never really considering removing the fan altogether. I was only thinking of replacing.

Thanks for the tip on looking up the specs. This is the fan: http://www.nmbtc.com...s/ac4715ms.html

It says 50-102 CFM. Considering the noise, I can assume it's at a steady 100.

I'll try to clean it when I take it out, like you suggested, hoagtech, but I don't know how much good that'll do. The projector is in great condition and everything else is very clean, so I don't see how the fan could have been roughed up. I already tried WD-40, and all that did was make my entire room smell like WD-40.

[NFS]

Everything has its purpose......but to upgrade the part would be wise because you would gain quiet and efficiency