[BakedBandit]

I run a sealed room that utilizes a fan circulating air through a carbon filter to minimize smell inside the room. I currently do not vent at all, but would like to be able to vent 2-3 times during lights out, mainly to reduce the excess co2, and also take some load off of the dehumidifier right after lights out.
I was thinking about putting a tee fitting on the output of the fan so that I can have a duct running out through the ceiling that is normally closed, but could open when I wanted to vent and close again when I'm done.
Does anyone have a suggestion for brand and maybe model that would be cheapest and easy to use? If it's more than another fan I could just use an extra fan and filter ok a timer with some sort of damper that closes when the fan shuts off, but seems like there are cheap options online. Im pretty sure somebody uses something like this on here, figured I'd check before I buy something.
Thanks in advance.

[DunHav`nFun]

A long held cash cropper trade secret with sealed rooms once medville got rolling in 96 , is they figured out during lights off that CO2 and RH spiked like a mofo due to the plants getting rid of all excess CO2 and humidity they didn't utilize during lights on.......that said.....

They added exhaust fans hooked to humidistats and once the lights were out when CO2 and humidity spiked , the exhaust fans kicked on and sucked out the excess RH as needed and in turn got rid of the excess CO2 the plants didn`t metabolize during lights on.....anyways...

Hope that helps.....DHF.........

[BakedBandit]

Thanks for the input. I would like to avoid controlling an exhaust via humidity, it might run all the time and not keep it in range depending on the ambient humidity. That's one of the big reasons for me running sealed. I would rather just vent a few times as needed, just unsure of the exact best way to do it.

[getpulse.co]

A short cycle timer might be what you are looking for. It also has a LUX setting so it will only activate during lights on, off, or both.

[BakedBandit]

Originally Posted by getpulse.co

A short cycle timer might be what you are looking for. It also has a LUX setting so it will only activate during lights on, off, or both.

Im not sure you are reading my original post? This isn't what I'm looking for.

[BakedBandit]

Anyone got any reccomendations on powered vents before I go out on a limb and buy one?

[MrBungle]

look up Belimo damper actuators

[BakedBandit]

Originally Posted by MrBungle

look up Belimo damper actuators

Thank you and nice name!

[DunHav`nFun]

You only exhaust during lights off with humidistat set to the percentage parameters you want , and I assure you RH can spike way high during mid-late flower during lights off when they drink and swell like crazy.....regardless....

Good luck....DHF..........

[BakedBandit]

Originally Posted by DunHav`nFun

You only exhaust during lights off with humidistat set to the percentage parameters you want , and I assure you RH can spike way high during mid-late flower during lights off when they drink and swell like crazy.....regardless....

Good luck....DHF..........

Yeah, that's what I'm trying to do, but it won't work just to vent for me the whole time lights are off as the air that will be coming in is higher humidity than I want. I just want to vent for the part right after lights out, and maybe for a few minutes a couple more times, and then rely on the dehumidifier mostly. Just looking to move out the quick spike of humidity after lights out and clear out excess co2 a couple times.