Multiple Tents, 1 Fan?

I am working on a multiple tent system, rather then going with a actual open grow room. I currently have a 176cfm fan (4 or 6 inch). I *know* that this fan will NOT do what I need it to do, so I want to get some input on my math on size fan for my tents.

The way I have this set up is all the tents, but 1 will be in a linked chain. Their sizes are:
36W x 18D x 60H = 22.5 Cubic Feet
32W x 32D x 60H = 36.5 Cubic Feet
32W x 32D x 60H = 36.5 Cubic Feet

These are in direct line of one another and vented one to the other. The last one is a bigger tent that is on the other side of the chain:
48W x 48D x 84H = 112 Cubic Feet

The black tent is using a 150w T5 lighting. The red and blue are using 125W UFO LEDs, and the green is using a 400W HID

This is the layout, not to scale, but you will get the idea.


The room has access to a attic wall that is above the garage. My intent is to cut out a hole through the wall as a pass through, put the fan, filter, & air pump in there to greatly muffle out the noise. Plus *IF* there is any smell issues, venting into the attic in the garage will help hide smell more and will not fill the room/hallway/house with the smell.

If we add in the amount of ducting (assuming 8 inch around and 8 feet long) = 14.25 Cubic Feet

So my total space is 221 Cubic Feet.

So I want to go WAY over the needed CFM, do to the travel and multiple tents. I am looking at one of the CAN-FANS RS8 HO, which offers 722 CFM. This is 3x the figured amount.

So the questions are, will this fan:
Offer enough air flow to remove any smells?
Offer enough air flow to remove excess heat?

If you have another suggesting for a fan, I would love the input.

Thanks.

I have a 745 cfm 8" fan running into a duct tee. One of the ends of the tee goes to a small veg tent (and it's cool tube MH light), the other goes to a duct booster fan (200 cfm) and up to my larger flower tent. Works well, sucks the tent walls in, no smell. The veg tent is 3x2x5 and the flower is 4x2x5.

whatsadank said:

I have a 745 cfm 8" fan running into a duct tee. One of the ends of the tee goes to a small veg tent (and it's cool tube MH light), the other goes to a duct booster fan (200 cfm) and up to my larger flower tent. Works well, sucks the tent walls in, no smell. The veg tent is 3x2x5 and the flower is 4x2x5.

Click to expand...

Thanks for the input. My only concern is that your total cubic feet is only like 70. I am going almost 3x more space, but I am very encouraged that you are getting such a powerful negative pressure that you are sucking in the walls in. I hope that Can-Fans RS8 HO will give me the same performance.

Thank you for your input and experience.

elrodvoss said:

Thanks for the input. My only concern is that your total cubic feet is only like 70. I am going almost 3x more space, but I am very encouraged that you are getting such a powerful negative pressure that you are sucking in the walls in. I hope that Can-Fans RS8 HO will give me the same performance.

Thank you for your input and experience.

Click to expand...

Roger!
My biggest input would be run as large as you can go with the ducting, run a large diameter fan, and avoid as many bends as possible. You can buy a 1500 cfm fan and only actually be pulling about 200 cfm or so (seen that done..) because of poor duct routing or sizing.