Can I cool two cabs with 1 fan?

I currently have a single grow space but would like to build two separate ares so I can get something a little more perpetual going. I would like to avoid buying any new equipment and was wondering if this plan would work to ventilate both areas with what I've already got.

I would like to build two 3'x3'x5' frames and enclose them with 6mm poly. I want to put my 250w HPS in one and use 10 23w cfls in the other. I plan on having a small clip on oscillating fan in each "tent". I would like to give each tent a 10" hole near the bottom as an intake and run some ducting in an s curve to make each intake light proof. For the exhaust (this is what I'm not really sure about) I would like to run 2 separate 6 inch ducts from near the top of each tent and have them come together at a duct "y" splitter. On the other end of the split I would like to attach a 200 cfm duct booster fan and have that blowing into a small box. This small box will hold my 6" carbon filter which will be hooked up to my 6" inline fan rated at 400 cfm. The fan will be set up to blow out of an open window.

I hope this makes sense to anyone who takes the time to read it. Any help is really appreciated.

Here's a visual aid that will hopefully help clear things up.

add the cf of each room together if the cfm adds up u will be ok i like to overkill my ventilation

and a fan pulling it better than a fan puching

the volume of each tent is 45cf. so 90cf of growing space. The small duct fan has 200 cfm and is split on the y so it's pulling 100 cfm from each tent. The large fan should over power the booster fan even on the filter. It's rated at 400, but with the filter I figure it is probably only pulling like 300. That still is only 150 cfm per tent. I figure If I keep the ducting short and smooth and keep the ambient temps comfortable the temperature should be okay right? Does anyone see a way to improve this?

i dont see heat being a problem my room is 6x8 with 1000w and a 600w and use a 8in 700cfm fan 77f max day temp

are your lights air cooled?

yes they are

I would say you need a little more than a 200cfm booster fan. those booster fans are not good against resistance. A 200 cfm high quality fan... like can or vortex would do well though, imo. try to keep the Y even... an even distance and angle from the intakes going to the fan.

to significantly cut down on noise.... i use an oversized fan and speed adjuster. A 700cfm running at 1/3 speed is super quiet. a 230 cfm maxed out is loud. i know it is a lot to spend for a "quiet" function. but it is well worth it for myself.

Thanks for the response Henry. I have the 400 cfm inline fan, but I need it on the filter and the filter is capped at one end. I created the box contraption to hold the fan and filter because I thought that this way the 400 cfm fan would be pulling all the air from inside that little box through the filter. Since the box is connected to the tents by ducting, the 400 cfm fan would actually be pulling the air from the tents. I have the 200 cfm booster fan sitting here so I figured it wouldn't hurt to throw it in there, you know, as a booster. The fan I have on the carbon filter looks just like the one in your picture. Are my plans legitimate? That is, do they obey the laws of air movement and if not then what is wrong with the plan and how can it be improved with the equipment I already have.

georgyboy said:

Thanks for the response Henry. I have the 400 cfm inline fan, but I need it on the filter and the filter is capped at one end. I created the box contraption to hold the fan and filter because I thought that this way the 400 cfm fan would be pulling all the air from inside that little box through the filter. Since the box is connected to the tents by ducting, the 400 cfm fan would actually be pulling the air from the tents. I have the 200 cfm booster fan sitting here so I figured it wouldn't hurt to throw it in there, you know, as a booster. The fan I have on the carbon filter looks just like the one in your picture. Are my plans legitimate? That is, do they obey the laws of air movement and if not then what is wrong with the plan and how can it be improved with the equipment I already have.

Click to expand...

Sorry for such a delayed response.
Totally legitimate... I missed some key details. Like that you had another fan in this setup. My bad for cruising through posts.
Hope all goes well.