Humidity, temp and exhaust... Oh my!

[Lady Lollipops]

With exhaust:
Temp 68 to 73
Humidity 43 to 49

Exhaust off.
Temp jumps to 80 in about 5 minutes and climbs
Humidity jumps to around 55 to 60.

I'm trying the exhaust on a timer of 30 minutes on 30 off. In an attempt to keep temp near 77 without losing humidity.

 

[Death The Cultivator]

What size space do you have? How many CFM on your exhaust fan? Do you have a humidifier?

 

[Lady Lollipops]

2x2 tent.
One plant in 3 gal. Sack.
No humidifier... Yet.
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[Death The Cultivator]

So I've been researching ventilation and unless you have a fan speed controller, 200CFM is insane for a 2x2 and even for a 4x4. You have a controller so I would try turning it down first.

To calculate your required CFM for air exchange every 5 minutes L x W x H = ? Divided by 3-5. I'll assume a 2x2x6 would be 24 cubic feet divided by 3 is 8CFM. Even if you account for ducting bends, carbon filter and high heat your fan is probably still too large.

I think the best thing in the future would be a humidity/temp controller setup from InkBird or ACInfinity has exhaust fans with both sensors and adjust speed to maintain parameters.

Do you use or reference VPD? https://www.dimluxlighting.com/knowledge/vapor-pressure-deficit-vpd-calculator/

You may not have a temperature gun to take leaf readings but it still works as a general guideline for environmental parameters.

 

[Lady Lollipops]

So I've been researching ventilation and unless you have a fan speed controller, 200CFM is insane for a 2x2 and even for a 4x4. You have a controller so I would try turning it down first.

To calculate your required CFM for air exchange every 5 minutes L x W x H = ? Divided by 3-5. I'll assume a 2x2x6 would be 24 cubic feet divided by 3 is 8CFM. Even if you account for ducting bends, carbon filter and high heat your fan is probably still too large.

I think the best thing in the future would be a humidity/temp controller setup from InkBird or ACInfinity has exhaust fans with both sensors and adjust speed to maintain parameters.

Do you use or reference VPD? https://www.dimluxlighting.com/knowledge/vapor-pressure-deficit-vpd-calculator/

You may not have a temperature gun to take leaf readings but it still works as a general guideline for environmental parameters.

Thank you! I'm going to go talk with tech now lol

 

[Proph]

With exhaust:
Temp 68 to 73
Humidity 43 to 49

Exhaust off.
Temp jumps to 80 in about 5 minutes and climbs
Humidity jumps to around 55 to 60.

I'm trying the exhaust on a timer of 30 minutes on 30 off. In an attempt to keep temp near 77 without losing humidity.

Both sets of numbers are fine.. 68-73 degrees with 50-60% humidity is fine, a little low, but fine. 80 degrees is fine, even 85 is fine if it ever got that high, and so is 40-50% humidity. Trying to lock in 77 degrees exactly can be difficult. 77 degrees is a ball park number. 73 is in that ball park, and so is 80. Same with humidity.

 

[Lady Lollipops]

Both sets of numbers are fine.. 68-73 degrees with 50-60% humidity is fine, a little low, but fine. 80 degrees is fine, even 85 is fine if it ever got that high, and so is 40-50% humidity. Trying to lock in 77 degrees exactly can be difficult. 77 degrees is a ball park number. 73 is in that ball park, and so is 80. Same with humidity.

Would it be better to have exhaust set to run half hour on, half off or is it better to just choose one.

 

[Proph]

Would it be better to have exhaust set to run half hour on, half off or is it better to just choose one.

Either way should work. You will most likely end up getting an average of the two temp scenarios.

 

[Lady Lollipops]

Thanks! I appreciate you!

 

[Mustang92]

you could call the exhaust fan an a/c unit and run it on a temp. switch from inkbird.
are all rooms this hot in house/apartment can you move to different room or basement.

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