2x2x5 Veg Tent Ventilation Question

pahpah-cee said:

You need to bring fresh air in and usually the most cost effective way is a fan pulling the hot air out from the top port- leaving a bottom flaps open for passive air intake.

you can get a 4” inline fan for real cheap. If it has a controller on it you can turn it up or down depending on your needs.

it’s better to get a fan that has a little more power than you need. That way you can run it at a lower speed which will be more quiet and put less strain on the motor.

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Controllers usually strain a motor more than help. It is designed to run at full capacity and playing with its voltage will hurt over time more than help. I usually keep my controllers above 80%. On fans, lighs ect

ProPheT 216 said:

Controllers usually strain a motor more than help. It is designed to run at full capacity and playing with its voltage will hurt over time more than help. I usually keep my controllers above 80%. On fans, lighs ect

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Interesting, That’s good information.

ProPheT 216 said:

Controllers usually strain a motor more than help. It is designed to run at full capacity and playing with its voltage will hurt over time more than help. I usually keep my controllers above 80%. On fans, lighs ect

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Different motors work with different controllers so if you use the right one it doesn't hurt the motor. I made a speed controller using a ceiling fan controller and my 6" no-name inline fan has been running with it at half speed for 12 years or so and was well used when I got it. It's hooked up to my temp/rh controller too so only runs when needed. I have a couple of 6" heavy duty fans that look like large computer fans and only one will work with that ceiling fan one but the other works fine using my variac where the first one doesn't like that.

When you try a speed controller on a fan and it makes a rattling sound when you slow it down then that will screw up a fan and the noise is really annoying. Do not use a light dimmer.

This is the controller setup I've been using for the last 20 years. The speed unit is the separate one on the left.



Make your own temp/rh unit with a 120/240v heat/cool thermostat wired for the cool side and a bathroom RH fan controller.

ProPheT 216 said:

You need air exchange, blowing the same air with all the co2 used up is pointless.

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Thanks for the input. I was experiencing slow growth with my first batch of seedlings in the veg tent and this variable was not accounted for.

Went for the 4" fan from vivosun. Thanks again.