Ventilation question

[wandrew640]

Okay, probably a stupid question. Buuut, if I put a 6 inch fan with a filter on it on a 4 inch PVC pipe about ten ft long, would I be able to get slightly more cfm through it than with the 4 inch fan? I'll have an 11x6x80" room with two 3x3s in it, they will have a 4 inch fan and filter pulling from both of them exhausting into the 11x6. Then I want the 11x6 venting outside via an existing 4 inch PVC pipe. Can I do it? How? Please help

 

[JoeBlow5823]

Okay, probably a stupid question. Buuut, if I put a 6 inch fan with a filter on it on a 4 inch PVC pipe about ten ft long, would I be able to get slightly more cfm through it than with the 4 inch fan? I'll have an 11x6x80" room with two 3x3s in it, they will have a 4 inch fan and filter pulling from both of them exhausting into the 11x6. Then I want the 11x6 venting outside via an existing 4 inch PVC pipe. Can I do it? How? Please help

Yes you should get more air through it. How much? Not sure.

 

[JoeBlow5823]

Okay, probably a stupid question. Buuut, if I put a 6 inch fan with a filter on it on a 4 inch PVC pipe about ten ft long, would I be able to get slightly more cfm through it than with the 4 inch fan? I'll have an 11x6x80" room with two 3x3s in it, they will have a 4 inch fan and filter pulling from both of them exhausting into the 11x6. Then I want the 11x6 venting outside via an existing 4 inch PVC pipe. Can I do it? How? Please help

Two 3x3s shouldnt require all that much ventilation.

 

[wandrew640]

I figured the 4 inch would be good split between the two. Do you think another 4 inch would do the 11x6x80"?

 

[JoeBlow5823]

How much light are you running?

 

[Renfro]

If you use a centrifugal style fan it will do a lot better against the restriction than a mixed flow or axial fan.

 

[wandrew640]

3 qb96s in each 3x3 2 on each 320h 54a driver

 

[wandrew640]

The centrifugal are the more common type right?

 

[JoeBlow5823]

3 qb96s in each 3x3 2 on each 320h 54a driver

And how many watts is that?

 

[JoeBlow5823]

The centrifugal are the more common type right?

Yeah the metal ones. They are louder but they are more capable of really forcing air.

 

[Renfro]

I dunno about more common, I mean they are, but so are the mixed flow fans like the AC Infinity.

They look like this:

 

[Renfro]

If there is a dryer vent on the outside of the 4 inch pipe then it will probably offer the most restriction. Either way, you will take a big hit in CFM.

 

[wandrew640]

It's an open 4 inch pvc pipe. On that driver should be around 160w each at the wall. They're badass and dimmable, planning on mounting drivers outside of the tents to help manage heat

 

[JoeBlow5823]

How many total watts of light are you running?

 

[wandrew640]

Well that will change depending on what the plants like but I guess the potential would prob be 960ish between the two which now that I say it is way too much haha but each driver is supposed to be good for 320ish and I'll have 3 drivers with 6 panels

 

[JoeBlow5823]

Well that will change depending on what the plants like but I guess the potential would prob be 960ish between the two which now that I say it is way too much haha but each driver is supposed to be good for 320ish and I'll have 3 drivers with 6 panels

Thats not very much shouldnt be to hard to cool.

 

[wandrew640]

Exactly, I didn't know how concerned I should be with replacing the air in the room every so many minutes

 

[Renfro]

Exactly, I didn't know how concerned I should be with replacing the air in the room every so many minutes

Thats only for heat, so if you can get away with less more power to ya.

 

[wandrew640]

I thought it was also for fresh co2 etc

 

[JoeBlow5823]

I thought it was also for fresh co2 etc

Plants dont need as much co2 as people think. You have a small grow.