Idea to exhaust below closet door... What do you think?

I have a small flowering closet that is 3'x4' that is flowering 4 healthy ladies. My closet is set up and is working nicely. I am on 12/12 which cycles at night when I am home. I have been leaving the closet open while the 400w HPS light on with a fan bringing in fresh air. This works great, but I had an idea come to me, and I was looking for some thoughts on it.
My door is 30" wide and has a 1" gap below it. I fill the gap so no light gets in when my girls are sleeping.
I was thinking about making a vent that would snug up against the bottom part of the door and using half the gap as intake and the other half as exhaust.
I would connect ducting from my 6" outlet of my light and use fans to exhaust it down and out through the gap below my door.
My fresh air would do the opposite but without any ducting.
My caregiver thinks I it will work nicely, but I will have to find a fan that can keep the air moving enough to cool the entire closet.
Does anyone see any issues with this?
I think I will tinker around with it when my girls wake up. I will post pics afterwords.

When I decide I want to do something I do it, so I made a couple vents to go under the door. These are just to give me an Idea if it will work before I fab up a vent.
I made these out of cereal boxes. the one that has the ducting on it is for the exhaust, it will connect to my light and blow the air out below the door. The other is just to pull in fresh air...
Do I need to pull in fresh air or could I just have a passive intake?
Once my girls wake up I will slap these in and see how they work, I have a feeling It wont exhaust enough with the little pc fans I am using now. Maybe I will invest in a better fan.

Maybe the pictures below will give you some ideas.

I would however say that you should vent hot air away from the area where you bring in cool air from.

Although in my closet door i have vents they are only for intake and my exhaust goes up and into the attic space above.



J

My closet is below the stairs so there is no place to vent above. It does share a wall with the garage, but I would like to do it without cutting holes in walls or doors.
Here are a few pictures of my room and the light.

Jondamon, that is slick, what kind of fans do you use?

IN the door i use an

AKASA VIPER PWM fan that is 84CFM around 140m3/h

As exhaust i currently am using an RVK125A1 in a cooltube 160CFM

After my current grow is finished i will be upgrading to a speed controlled RVK150L1 440CFM (660m3/h) sealed lighting system with the RVK125 being my air exchange and filter.


J

IMO

Fundemental basics for using HID lamps are
1. Exhaust as far away from your grow room as you can
2. Intake air from an area that is not being used by your exhaust.

As you can see from my pictures i intake air from the room with my closet in it and then exhaust up and out into the attic as per pic below using spigot plates to attach ducting to.



J

So for my 400w bulb Will i need a fan that big (160cfm)? that seems like a lot of air.

I use a 600w and the 160CFM is not powerful enough during summer running. Which is why i am upgrading to the 440CFM one ready for the summer.

IMO 160CFM is probably the minimum you should be looking at for that light.


J

Here is a basic design to follow if you are thinking about redesigning.


J

You inspired me... I am going to cut a hole in my wall and exhaust into the garage. I have everything I will need to do what you show in your design. I will leave the space under my door for passive air intake. Where I live it does not get above 90 in the summers so I don't think I will have a problem keeping it cool. I keep it cool now just leaving my door open.
Thanks for your help. I will update you when I get the holes cut in my wall and everything installed. I think I will go pick up a new fan this afternoon.

NO problem.

Let me know if you need any more advice!




J

ha thats a fantech fan isnt it? i use the same one. it moves alot of air.

Very nice. Personally I would have just drilled a hole in the door.

jondamon said:

I use a 600w and the 160CFM is not powerful enough during summer running. Which is why i am upgrading to the 440CFM one ready for the summer.

IMO 160CFM is probably the minimum you should be looking at for that light.


J

Click to expand...

I exhaust up my chimney with a 440cfm I can vent all my small apartments air in less than 1min if necessary and it all goes up up up all the way to the 4th story and taken away by the wind.