Exhaust fan

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macandhans

Member
Does anyone here have experience with S&P fans? I'm wondering if they will have enough power to pull through a filter.

The filter i'm getting is 8"x12" with a 1" bed of carbon. I was thinking of using the S&P 200 which is an 8" fan with a max cfm of 538. My filter manufacture says to use a 300cfm fan with it so I was going to use a variable speed controller to lower the speed.

Am I on the right track or should I stop before I waste money on this fan to pull through a filter?

Link to fans: http://www.hvacquick.com/products/residential/Fans/Inline-Fans/SP-TD-Series-Inline-Fans

Edit: forgot link
 
oregon024

oregon024

Active Member
Well since your getting started.I'm sure there are many things you'll need.A simple bathroom fan cost less than 14.00 each at lowes.Would do it for you.Rather than throwing 200 bucks + on a fan.Use that money on other things.If your room is still warm add a second fan.And rig them together.Still way cheaper but do the same thing.You can use one for air intake also.Good Luck oregon024
 
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macandhans

Member
Hmm, I never said I was getting started, did I? I was asking a specific question about a specific brand and model fan. Thanks for your input though. Cheers.
 
jugg1es

jugg1es

Member
if you're pulling too much CFM through the filter, it will not scrub the air efficiently. If this was a stand-alone unit in a grow room (i.e. not an exhaust fan), it would be fine...

But since you're using it as the last stage in your exhaust, i think you will find that it's pulling air too quickly through the filter and it will not eliminate all of the odor.

What you could do is a buy an 8" to 6" reducer (sell em at home depot with all of the other ventilation piping) and buy a 6" inline fan that will have less CFM.

The idea of a carbon scrubber is for the air to hang around the carbon long enough to react and remove the odor particles. if you have a really stinky grow and you need to have zero odor, you should shoot for even less than 300CFM that the manufacturer recommends. You want it to be able to pull air through the carbon, but not too quickly.
 
M

macandhans

Member
jugg1es said:
if you're pulling too much CFM through the filter, it will not scrub the air efficiently. If this was a stand-alone unit in a grow room (i.e. not an exhaust fan), it would be fine...

But since you're using it as the last stage in your exhaust, i think you will find that it's pulling air too quickly through the filter and it will not eliminate all of the odor.

What you could do is a buy an 8" to 6" reducer (sell em at home depot with all of the other ventilation piping) and buy a 6" inline fan that will have less CFM.

The idea of a carbon scrubber is for the air to hang around the carbon long enough to react and remove the odor particles. if you have a really stinky grow and you need to have zero odor, you should shoot for even less than 300CFM that the manufacturer recommends. You want it to be able to pull air through the carbon, but not too quickly.
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I was thinking about this last night. As long as there is negative pressure in the grow room, the slower the better. Unless heat is an issue as in my case. I have a 3'x2'x5' cab with a 400w hid inside and due to security reasons I cannot vent hot air outside(the grow room). I will try this fan anyway and see how it goes since it seems I will need to add a cooltube to remove the majority of heat from the cab, doing this I think would allow me to run a fan at a lower cfm to filter the air properly, as you were saying.

Thanks
 
jugg1es

jugg1es

Member
macandhans said:
I was thinking about this last night. As long as there is negative pressure in the grow room, the slower the better. Unless heat is an issue as in my case. I have a 3'x2'x5' cab with a 400w hid inside and due to security reasons I cannot vent hot air outside(the grow room). I will try this fan anyway and see how it goes since it seems I will need to add a cooltube to remove the majority of heat from the cab, doing this I think would allow me to run a fan at a lower cfm to filter the air properly, as you were saying.

Thanks
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Can I ask what you mean by a cooltube? is that like an AC unit? or do you mean a tube covering your light to drag room air across your HPS?

BTW, your grow box will get insanely hot w/o any kind of hot air exhaust with a 400w HPS. I have a similar setup, and if I didn't have hot air exhaust, the temp would get into the 100s (Fahrenheit)
 
M

macandhans

Member
jugg1es said:
Can I ask what you mean by a cooltube? is that like an AC unit? or do you mean a tube covering your light to drag room air across your HPS?

BTW, your grow box will get insanely hot w/o any kind of hot air exhaust with a 400w HPS. I have a similar setup, and if I didn't have hot air exhaust, the temp would get into the 100s (Fahrenheit)
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Basically it's an enclosure for the light made of pyrex or some other glass that can withstand the heat. You can pull air through a filter --->cooltube(or hood) --> fan. Some people use two exhaust fans in their set ups though. One fan draws filtered air out of the room/box and the other pushes/pulls air from outside the box/room across the light's and out of the room thereby removing heat.

Yea i'm aware of the heat. I use a stanley blower now with a diy air filter and i'm not satisfied at all. It sounds like a jet engine for one thing.
 
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