Help with extractor fan requirements

[Cat]

As ideals for noise, yes I fully agree.
In terms of performance...doesn't make any difference inside or out. (Physics growbro).
The advice on keeping ductwork short, yes absolutely. Especially if the setup is inside the tent!, lack of space obviously

Edit: If we wanted to do the math on cubic feet or cubic meters per hour,...
Ingesting air into the filter because of square inches into is bigger than inside the filter to out,...yes better efficiency.
But lets also consider noise and setup.
In the end, both will work very well.

@ricky4003 ( didn't mean to kick you in the nuts on this one),...everything you said is perfectly true...

So, you would advise buying a slightly larger fan to the 4" carbon filter and using a fan controller to adjust accordingly?

 

[Cat]

Can I

My tent is 160cm x90cm x 50cm and I use a 5" ruck fan for extraction and there is no room inside for both fan and filter so I have the fan outside the tent. Try and get your fan as close to the filter as possible like stick a sheet of ply on top of your tent and place the fan on it then you will only have a short length of ducting which will make your fan perform better than it would if a long length of ducting was used. Remember using a carbon filter and long lengths of ducting will affect your fans performance so I would opt for a 5" fan which gives more power which you might need to overcome the drain taken from the filter and any ducting runs. If you decide on a later date to use an intake fan then choose a 4" fan .

Can I buy a decent converter to convert the different size of filter from 4" filter to 5" fan? If that makes sense?..

 

[GeorgeCloney]

And so keep the fan in the tent, and bow into the filer.
Keep the filter outside the tent.
Use minimal duct work.

 

[Cat]

Cheers

And so keep the fan in the tent, and bow into the filer.
Keep the filter outside the tent.
Use minimal duct work.

Cheers buddy

 

[Simplicio]

My first tent (3 x 3) has a 6 inch fan and filter hanging from the ceiling.
But ceiling space is at a premium for tall plants, and I'm looking for a better way.
In a different 2 x 4 tent I've got a filter sitting upright on the tent floor, connected to an exhaust fan that sits outside an adjacent bottom tent porthole, and ducting going from the fan out a basement window.

So far, so good for 2 week old plants, but I do worry about stuff falling on the filter and dirtying it when the plants get big.

 

[AutoWonders]

Is it okay to set it up so that the filter is in the grow room and the fan is outside?

I've had my carbon filter and inline fan outside my tent for a long time. My fan sits on top of the filter. Both rest on a couple of sheets of Sorbothane. For vibration purposes. As long as you have a window cracked in the grow room for fresh air, it's just fine and dandy. Or perhaps that's fan and dandy. The main reason I put the fan and filter outside was to give me more space in my tent.