illmatik said:

I have two grow tents, one 4x8 and one 4x4 with a window in between them. The 4x8 has a 6 inch exhaust fan and the 4x4 has a 4 inch exhaust fan.

I bought a vent kit for the window but it only has a 4 inch port.

Would it be okay to connect both fan ducts to a Y at the exhaust vent? And is it a problem that the vent is only 4 inches, essentially reducing the 6 inch fan?

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Anthem said:

So if we take the 4" first we can get the area (square inches of the duct) by using this formula Pie r2. 2 x 2 =4 x 3.1416= 12.57 square inches of duct moving air
Now we have the 6" duct 3 x 3 = 9 x 3.1416 = 28.27 square inches of duct moving air.
We have a combined square inched of 40.84
The opening in the window is 12.57 square inches.
Will there be a restriction in air flow?

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