partially blocking exhaust to increase humidity

[roosterinmyrari]

hello, i've got a s&p inline fan for my exhaust and i'm trying to figure out how i can increase my humidity without getting a fan speed controller.

is this safe?
i was considering covering a 1/3 of the exhaust ducting.

 

[Heimdallr]

This may cause positive pressure, which as we all should know by now causes odor to escape unfiltered.

 

[r2k]

Blocking the exhaust will simply decrease airflow and increase temperature. Increasing temperature will make your relative humidity go down, not up. Dropping temperatures will cause relative humidity to increase.

Increasing relative humidity is really difficult in a situation where you pull outside air directly into your grow zone. You are limited by the water content you are pulling in. If there isn't enough water content in the incoming air, it takes a large amount of energy to evaporate a useful quantity of water to satisfy your needs. The problem is that your box will keep pushing out any humid air and drawing in the cooler and drier air.

You really need to be able to extract the heat energy without exchanging the air. I don't know how to do that unless you have some kind of air conditioner, but even that will condense water from the air on the cooling coils. I don't really have a good method for doing what you want. I guess you could boil water in the area where you want to humidify, but that takes a bunch of energy and it just doesn't really work well for most situations. You are normally exchanging air too fast for any kind of humidity to build up.

I'm sorry I can't be more positive, but I haven't seen a good way to do what you want. The simplest thing I know is drop temperatures in your grow zone as much as you can and that will raise relative humidity.

-r2k

 

[Snook]

hello, i've got a s&p inline fan for my exhaust and i'm trying to figure out how i can increase my humidity without getting a fan speed controller.

is this safe?
i was considering covering a 1/3 of the exhaust ducting.

humidifier and controller and why not a rheostat?

 

[vostok]

just leave a pot of water in there, but double check your Rh first...?