Cooling Fans

[nnewhouse]

I need some advice on cooling fans. I want to use four fans in a closed canopy for a 180g tank. I would like them to push somewhere around 50-70CFM and be dead silent. Any suggestions? Which type of fan can you plug directly into a 110 wall plug? I always get them confused. Thanks for the input!

[hebsway]

Sorry don't know of any that run dead silent. I just went through this same problem and ended up with 12 volt fans and a power adapter. I bought 4 12volt computer fans that push about 80cfm at 21dbs each. They really are quite and are doing a great job and I'm into them with the adapter for less than $100. When I checked the 110volt fans were going to cost about $60-$80 each off of eBay and they were not rated as quite.
These are the ones I used:
http://www.radioshack.com/product/index.jsp?productId=2211703#tabsetBasic
Good Luck

[nnewhouse]

Thanks hebsway! Any more ideas?

[das75]

most of the 120vac muffin fans I found a little more noisier than the 12vdc. Using a 120mm Gelid (64cfm/21dB) wired onto a wall-wart adapter I had around (but similar new at Radioshack ~$10).

Amazing how quiet.

[nnewhouse]

Thanks das75! What a great fan. I have never seen one that is waterproof before. That should come in handy. Are there any ac-dc converters out there you could plug 4 fans into?

[bobears03]

Have you checked these out?

http://www.reefgeek.com/lighting/Parts_&_Accessories/Fans/Orion/

[nnewhouse]

Haven't seen those but they seem to be a little noisy. Sure do push a lot of air though.

[mr.maroonsalty]

Noctua case fans are dead silent; I accidently stuck my finger in mine and set it slightly off balance which I'm a wee bit thankful for because now if I listen I can hear if its on which is comforting with a 250mh in less than 3cf.

[reefermad619]

I would use regular 12v dc fans. Check out newegg.com. They have some fans that move >90cfm and at <20db.

[Aristarchus]

Came across this the other day on the forums
http://www.coolerguys.com/woodkits.html

If I were to put one in my canopy this would be it since it looks nice and comes as a complete package

[mr.maroonsalty]

Size: 140x140x25 mm
Bearing: SSO-Bearing (More Info...)
Blade Geometry: NF-P14 Blade Design with VCN (More Info...)
Rotational Speed (+/- 10%): 1200 RPM
Rotational Speed with L.N.A. (+/- 10%): 900 RPM
Rotational Speed with U.L.N.A. (+/- 10%): 750 RPM
Airflow: 110,3 m³/h
Airflow with L.N.A.: 83,7 m³/h
Airflow with U.L.N.A.: 71,2 m³/h
Acoustical Noise: 19,6 dB(A)
Acoustical Noise with L.N.A.: 13,2 dB(A)
Acoustical Noise with U.L.N.A.: 10,1 dB(A)
Static Pressure: 1,29 mm H2O
Static Pressure with L.N.A.: 0,77 mm H2O
Static Pressure with U.L.N.A.: 0,53 mm H2O
Input Power: 1,2 W
Input Current: 0,1 A
Voltage Range: 12 V
MTBF: > 150.000 h

Hard getting quieter than 19.6

[nnewhouse]

Noctua fans seems like the best bet. They come with a six year warranty and I don't have to by a converter. Thanks for the input everyone!