Making a carbon filter with a computer fan?

I Roc Hos · #1 (**permalink**) 10-19-2006, 12:07 AM

I'm planning on buying computer fans for ventilation of my grow box. My question is will a computer fan have enough force to used as a fan for a home made carbon filter?

Here are the specs of the computer fan:

Fan Dimension: 120 mm x 120 mm x 25 mm
Fan Speed: 2000 rpm
Max Air Flow: 54.5 CFM
Noise: 27 dBA
Life Time: 100,000 hours

Thanks in advance!

MonArch · #2 (**permalink**) 10-19-2006, 12:12 AM

i believe it is possible with another fan but your going to have a very small filter
not much larger than the diamerers of the fans

I Roc Hos · #3 (**permalink**) 10-19-2006, 12:27 AM

Quote:

Originally Posted by MonArch

i believe it is possible with another fan but your going to have a very small filter
not much larger than the diamerers of the fans

The computer fan is about 4.7 inches (120mm).

bluebong · #4 (**permalink**) 10-19-2006, 02:13 AM

No. Those fans do not have the torque to pull air against enough resistance to make an effective scrubber. To get rid of smell, air has to touch a significant amount of carbon, and while that fan can pull against a little resistance, even that slows it down a shit load.

Squirrel cage fans will do it. Or inline blowers. Big motors.

I heard you can do ok with a bathroom exhaust fan, but it's not great.

I Roc Hos · #5 (**permalink**) 10-19-2006, 02:57 AM

I found another fan, same size except more powerful. I think this one might do it here are the specs:
Voltage =12v
Amperage: .6 amps
Input power: 7.2 watts
Speed: 3200 rpm
Airflow: 130 cfm!
Noise: 48.0 Db(A)

Will this one work? If so do you think that 48.0 Db is too noisy? This is for a "stealth" Grow. Thanks

Mr. Muffin · #6 (**permalink**) 10-20-2006, 03:36 AM

48 Db is about the noise a vacume cleaner give off... lmfao

if u make the scrubber in a tube shape with a 120mm fan on each and it should work... ive seen it done, ill try to get a link

edit: http://cgi.ebay.com/CARBON-AIR-SCRUB...QQcmdZViewItem
u could make one exactly like this really easy, but u can use lower cfm fans if there at both ends because they suck and blow air through at the same time... u could also have both fans blowing into a tube with permiable walls (basicly 2 layers of screen with activated carbon between them.

I Roc Hos · #7 (**permalink**) 10-20-2006, 08:40 PM

Quote:

Originally Posted by Mr. Muffin

48 Db is about the noise a vacume cleaner give off... lmfao

Really???

MonArch · #8 (**permalink**) 10-20-2006, 11:58 PM

whatever u decide to build when u mount the fans put rubber at any contact points to reduce vibration and thus noise, also you can wire any 12v to a 9v adapter it will slow it down to make it quieter but if that doesnt have enough power you can buy a dimmer switch and hook that up to the fans to fine tune your rpms so that you get enough sucktion at the quietest speed. my two cents

Mr. Muffin · #9 (**permalink**) 10-22-2006, 05:27 AM

well i dn if its quite that loud, maybe as loud as a car idling but the tone of fans is high pitched, meaning its kinda a peircing sound, and really annoying lol...

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
grow box design guide	gr0wer	Grow Room Design/Setup	92	11-18-2009 08:43 PM
Why Evolution Is Wrong	IGotTheCottons	Spirituality And Philosophy	654	09-28-2009 11:35 PM
roor carbon filter?	DankSkoal	Recreational Marijuana Use	0	05-29-2006 05:53 AM
air purifier with carbon filter	spoof	Grow Room Design/Setup	12	03-16-2006 04:31 AM
growbox questions: lights, fans, & carbon filters...	TDUBB	Grow Room Design/Setup	4	09-16-2005 07:02 PM

Site links

FAQ

Important

Extra

#1 (permalink) 10-19-2006, 12:07 AM
I Roc Hos Blazed and Confused Join Date: Aug 2006 Posts: 136	Making a carbon filter with a computer fan? I'm planning on buying computer fans for ventilation of my grow box. My question is will a computer fan have enough force to used as a fan for a home made carbon filter? Here are the specs of the computer fan: Fan Dimension: 120 mm x 120 mm x 25 mm Fan Speed: 2000 rpm Max Air Flow: 54.5 CFM Noise: 27 dBA Life Time: 100,000 hours Thanks in advance!

#2 (permalink) 10-19-2006, 12:12 AM
MonArch Registered User Join Date: Jul 2003 Posts: 164	i believe it is possible with another fan but your going to have a very small filter not much larger than the diamerers of the fans

#4 (permalink) 10-19-2006, 02:13 AM
bluebong Look, a fat little goat!! Join Date: Oct 2006 Location: In the shitty Mojave. Posts: 212	No. Those fans do not have the torque to pull air against enough resistance to make an effective scrubber. To get rid of smell, air has to touch a significant amount of carbon, and while that fan can pull against a little resistance, even that slows it down a shit load. Squirrel cage fans will do it. Or inline blowers. Big motors. I heard you can do ok with a bathroom exhaust fan, but it's not great.

#5 (permalink) 10-19-2006, 02:57 AM
I Roc Hos Blazed and Confused Join Date: Aug 2006 Posts: 136	I found another fan, same size except more powerful. I think this one might do it here are the specs: Voltage =12v Amperage: .6 amps Input power: 7.2 watts Speed: 3200 rpm Airflow: 130 cfm! Noise: 48.0 Db(A) Will this one work? If so do you think that 48.0 Db is too noisy? This is for a "stealth" Grow. Thanks

#6 (permalink) 10-20-2006, 03:36 AM
Mr. Muffin Registered User Join Date: Feb 2006 Posts: 347	48 Db is about the noise a vacume cleaner give off... lmfao if u make the scrubber in a tube shape with a 120mm fan on each and it should work... ive seen it done, ill try to get a link edit: http://cgi.ebay.com/CARBON-AIR-SCRUB...QQcmdZViewItem u could make one exactly like this really easy, but u can use lower cfm fans if there at both ends because they suck and blow air through at the same time... u could also have both fans blowing into a tube with permiable walls (basicly 2 layers of screen with activated carbon between them. Last edited by Mr. Muffin; 10-20-2006 at 03:42 AM.

#8 (permalink) 10-20-2006, 11:58 PM
MonArch Registered User Join Date: Jul 2003 Posts: 164	whatever u decide to build when u mount the fans put rubber at any contact points to reduce vibration and thus noise, also you can wire any 12v to a 9v adapter it will slow it down to make it quieter but if that doesnt have enough power you can buy a dimmer switch and hook that up to the fans to fine tune your rpms so that you get enough sucktion at the quietest speed. my two cents

#9 (permalink) 10-22-2006, 05:27 AM
Mr. Muffin Registered User Join Date: Feb 2006 Posts: 347	well i dn if its quite that loud, maybe as loud as a car idling but the tone of fans is high pitched, meaning its kinda a peircing sound, and really annoying lol...

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)