Do both fans have to be the same size?

conor c

conor c

Well-Known Member
coreywebster said:
In my option it's temperature difference.
I personally don't ever need an intake on any tent I've set up 8x4 square feet or below.
But someone in a hotter climate might.
Or someone running higher wattage, like 2x 1000w hps compared to 2x 600w LED.

If my desired temp is 79f and my ambient room temp is 69f then I have a reasonable amount of room for that increase and it won't require huge airflow to do it.
But if your ambient room temp is 75f and you desire the same 79f in the tent then you need a considerable amount more and you may get to the point where intake is needed or your tent would be under considerable pressure.

At the end of the day the wattage used and ambient temp dictate the requirements for extraction.( In an active air grow space, As opposed to a sealed room)

An open duct or tent flap allows a high amount of air passively.

Obviously other than that an intake allows all flaps (light leaks) to be closed , which would matter to some people, so that's another reason to have an intake.
But it has to be reasonably balanced because if the only way air can get in is through an intake fan then that can be a limiting factor , because it will limit how much air can be sucked out of the extraction. In that case the extractor is working too hard.

I'm sure a hvac guy would know more about the specific rules , but that's the general idea
Click to expand...
Your bang on with everything your saying bud
 
Star Dog

Star Dog

Well-Known Member
I've spare fans sitting but I wouldn't even consider using one on the inlet.

I've been there and it was a waste of time, trying to balance the inputs to prevent positive or negative pressure is a nightmare if there no exactly matched the tent will balloon or vacuum over time.
I'd leave a regular passive vent to eliminate all that shit, for emphasis when you get it balanced even moving ducting knocks it out...then the actual difference isn't worth it even if it was hassle free to set up.
 
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1212ham

Well-Known Member
itsaliveterps said:
I've just bought a 6" spyder fan for the exhaust to be connected to a spyder farmer digital controller but I noticed that it says I need both fans to be the same size? So will my intake fan have to be a 6' ? To use the digital controller
Click to expand...
I'm curious, why do you want an intake fan? Did Spider Farmer literature give you the impression it's needed?
 
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J

joesoap2013

Well-Known Member
If your using a controller your fans are turning off I take it?
Prob thats what it is shifting air in and out quickly
Would you get smell leaks chance of mold prob insects
 
Greengrouch

Greengrouch

Well-Known Member
If you’re not using the screen flaps you can do a 4in intake with a 6in exhaust. I use two 4in but my exhaust I run at a higher setting
 
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