Two tents, one carbon filter and Maximum ducting length

I have two closets that are built into one another. One is 3.5ft x 4ft and the other is the reverse (heights not an issue, 8ft ceilings). To help you visualize this, it’s practically in an “L” shape rotated clockwise 90 degrees. The left side will fit a 3ft x 3ft tent and the right will fit a 4ft x 2ft tent.

I have two questions about logistics, one being more important than the other;

First the more important question. The wall that the closest are on is poured foundations so i really do not what to drill a hole through to vent the carbon filter out that way, plus it’s the front of the house where the road and neighbors are located, because of this is like to run the ducting 30ft to the back side of the house which is block foundation. Is a 30 ft run too long for a 6” inline fan? If the answer to this is yes, than the next question will end up being obsolete since I’ll have to redesign where I would grow.

2) can I tie both tents into the same carbon filter? The plan would be to duct the tent on the left to the tent on the right and run the carbon filter in the tent on the right. My idea would be that the filter would draw the air from the first to the second and then one unit could filter both tents. Is this plausible?

As long as the fan and filter are large enough it sounds feasible

spliffendz said:

As long as the fan and filter are large enough it sounds feasible

Click to expand...

In theory I figured it would work but I just didn’t know about the length of the run. To put my mind at easy I may drop to a 4” duct after 10 ft to help increase the air velocity for the remaining distance

Someone will come along and help hopefully, I forgot where the calculator is to measure grow area vs fan size

You have to consider the filter slowing it down, also any bends in the ducting, drawing it out may help you a little

A 90 degree L shape is twisting ma melon man

For the 2 tents I would up your exhaust to an 8" just to be safe, but a 6" might do. DO NOT downsize the ducting until you have to once you penetrate the block wall if you're using a standard 4" louvered vent.
The 30' run won't be an issue even with flexible ducting. Just keep the bends as minimal as possible.

I run a 6" exhaust for my 4x8 veg tent that is wye'd into my dryer exhaust and there's no issues with both running @ 100%.

I have 2x - 8" for my flower tent so I have a pretty good idea of how much/far they can move comfortably.