Help with ventilation

FirstTimeGrwrLngTmSmkr

FirstTimeGrwrLngTmSmkr

Active Member
I'm trying to get a 15.5 x 17.5 x 7.5 grow room properly ventilated, before I bring in more plants. The room has two doorways and one window.
I currently have two fans moving air around the room but I need an exhaust/intake to do it the correct way.
I'm trying to find a window kit or something along those lines.. the two doorways lead into the garage and basement area. I can possibly run ventilation tubing from the window inside the room, through the room to the other window in the garage. Now, I am a chef NOT a carpenter, so I have no idea what size fan or types of equipment I'm looking for.. I'm not sure what would be best for my situation.. I'm looking to get anywhere from 6 to a dozen or more plants when I get the room prepared.. I'm asking anyone with experience to please point me in the right direction.. thanks for any information tips and suggestions. I definitely appreciate it
 
JSB99

JSB99

Well-Known Member
FirstTimeGrwrLngTmSmkr said:
I'm trying to get a 15.5 x 17.5 x 7.5 grow room properly ventilated, before I bring in more plants. The room has two doorways and one window.
I currently have two fans moving air around the room but I need an exhaust/intake to do it the correct way.
I'm trying to find a window kit or something along those lines.. the two doorways lead into the garage and basement area. I can possibly run ventilation tubing from the window inside the room, through the room to the other window in the garage. Now, I am a chef NOT a carpenter, so I have no idea what size fan or types of equipment I'm looking for.. I'm not sure what would be best for my situation.. I'm looking to get anywhere from 6 to a dozen or more plants when I get the room prepared.. I'm asking anyone with experience to please point me in the right direction.. thanks for any information tips and suggestions. I definitely appreciate it
Click to expand...
Here ya go...

6" inline fan-filter-speed controller combo
Periscope vent
 
JAMO_Grow

JAMO_Grow

Well-Known Member
What I suggest is one fan that blows inside the tent, this creates air circulation preventing stale air.Then having an intake fan blowing air from the room inside your tent, but having an extractor fan pulling the air out of the tent (extractor fan should be at the top pulling out the hot air) outside through the window.I had the a kitchen intake fan blowing air across my HPS light that was in a hood worked great.What light you running in this grow?
Hope this helps.
 
JSB99

JSB99

Well-Known Member
JAMO_Grow said:
What I suggest is one fan that blows inside the tent, this creates air circulation preventing stale air.Then having an intake fan blowing air from the room inside your tent, but having an extractor fan pulling the air out of the tent (extractor fan should be at the top pulling out the hot air) outside through the window.I had the a kitchen intake fan blowing air across my HPS light that was in a hood worked great.What light you running in this grow?
Hope this helps.
Click to expand...
AKA, "active intake". Without the intake fan, it's a "passive intake".

@FirstTimeGrwrLngTmSmkr, if you choose to use two fans, which is better, but at some cost, then you don't need to calculate your passive intake size. If using only an exhaust fan, which is much more common, then your passive intake size should be double the fan diameter. In other words, if you use a 6" fan, then you need two, 6" diameter intake ports, or equivalent.

There is actually a third option. If you're going to grow with HID lights, you can get an air-cooled hood (which you'd want to do regardless in most cases), use duct to draw outside air through the hood, then exhausting the air back outside. The advantage to this is that you are isolating the grow room air from the heat caused by the light. You need two fans to do this. One for the hood, and one for the tent, which you will still need to vent. This is how I've got mine set up. I use a 6" fan for the hood, and a 4" fan for the tent. I run a 1000w in my 4x4 tent, and most of the time I need to use the heat from the hood to help warm the room.

Check out my Grow Room thread below to see how I've got mine set up.
 
Hydrowannabe

Hydrowannabe

Well-Known Member
This is my temporary setup. It’s far from ideal but maybe you could get some ideas. Being that it is summer here, I’m no longer pulling air from outside, but I’m pulling air from my air condition vent. I’m sure carpenters will laugh at this setup and that’s ok,..it is fairly laughable. Ideally, I would have the carbon filter inside of the tent, pulling air and moisture out but this is how it is for now. The exhaust fan is on full power all the time (400 cfm),..my intake fan which is 350 cfm but I have it on a very low setting. This is not my permanent setup,..been having a little brain fog lately,..but it does keep my temps in the ideal range for me. I’ll post another pic of where I get my cold air intake during other colder seasons
 

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OldMedUser

OldMedUser

Well-Known Member
FirstTimeGrwrLngTmSmkr said:
I'm trying to get a 15.5 x 17.5 x 7.5 grow room properly ventilated, before I bring in more plants. The room has two doorways and one window.
I currently have two fans moving air around the room but I need an exhaust/intake to do it the correct way.
I'm trying to find a window kit or something along those lines.. the two doorways lead into the garage and basement area. I can possibly run ventilation tubing from the window inside the room, through the room to the other window in the garage. Now, I am a chef NOT a carpenter, so I have no idea what size fan or types of equipment I'm looking for.. I'm not sure what would be best for my situation.. I'm looking to get anywhere from 6 to a dozen or more plants when I get the room prepared.. I'm asking anyone with experience to please point me in the right direction.. thanks for any information tips and suggestions. I definitely appreciate it
Click to expand...
Are you planning to leave that large space open, partition it with walls, buy a grow tent or something else?

Is your basement cool so that if you draw air up from there and blow air out the window you can cool the room cheap?

Is the window situated so a fan in the window won't draw unwanted attention?

A simple solution would be to get one of those expandable window fans blowing air from the room to outside while cool air comes in from the basement. Would be hard to hook up a carbon filter for odor control tho with something like that.

Do you own the house so you can cut a vent hole or two if need be? Landlords get a little pissy about things like that. :)

:peace:
 
OldMedUser

OldMedUser

Well-Known Member
Hydrowannabe said:
This is my temporary setup. It’s far from ideal but maybe you could get some ideas. Being that it is summer here, I’m no longer pulling air from outside, but I’m pulling air from my air condition vent. I’m sure carpenters will laugh at this setup and that’s ok,..it is fairly laughable. Ideally, I would have the carbon filter inside of the tent, pulling air and moisture out but this is how it is for now. The exhaust fan is on full power all the time (400 cfm),..my intake fan which is 350 cfm but I have it on a very low setting. This is not my permanent setup,..been having a little brain fog lately,..but it does keep my temps in the ideal range for me. I’ll post another pic of where I get my cold air intake during other colder seasons
Click to expand...
You blowing unfiltered air into your carbon filter? Good way to plug it up and render it useless. I got one off a buddy who was doing that and a 440cfm fan could barely suck air thru it. It was old anyway but when I needed it it was useless. Got a nice new one bigger than I need and will be running it properly with the cloth filter on the outside where it can filter the dust that will be pulled in from the outside.

Going to try to make a kief tumbler out of the old one so not all is lost. :)

:peace:
 
JSB99

JSB99

Well-Known Member
OldMedUser said:
You blowing unfiltered air into your carbon filter? Good way to plug it up and render it useless. I got one off a buddy who was doing that and a 440cfm fan could barely suck air thru it. It was old anyway but when I needed it it was useless. Got a nice new one bigger than I need and will be running it properly with the cloth filter on the outside where it can filter the dust that will be pulled in from the outside.

Going to try to make a kief tumbler out of the old one so not all is lost. :)

:peace:
Click to expand...
Not to mention that pulling air is more efficient than pushing.
 
FirstTimeGrwrLngTmSmkr

FirstTimeGrwrLngTmSmkr

Active Member
JSB99 said:
Here ya go...

6" inline fan-filter-speed controller combo
Periscope vent
Click to expand...
Thank you so much!! I'm going nuts trying to figure out the best way to get this room properly setup. That link you sent is perfect. I'm desperately in need of fresh air flow!! I got 2 Phantom CMh315 's hangout now and the temperature is good at mid 70s. The RH has been around 45% or so and I am working harder than the fans to keep the conditions tolerable.. I figured out a good straight and simple path for the vent tubing to run from the window inside the room to the window on the other side of the house. The distance from one to the other is not far at all and it will be a straight line of airflow... BIG BIG problem avoided at an affordable price... thanks again.. you're help probably saved my plants..and my cash ...be Good brotha and I will be posting pics when I get it together...
 
FirstTimeGrwrLngTmSmkr

FirstTimeGrwrLngTmSmkr

Active Member
JSB99 said:
AKA, "active intake". Without the intake fan, it's a "passive intake".

@FirstTimeGrwrLngTmSmkr, if you choose to use two fans, which is better, but at some cost, then you don't need to calculate your passive intake size. If using only an exhaust fan, which is much more common, then your passive intake size should be double the fan diameter. In other words, if you use a 6" fan, then you need two, 6" diameter intake ports, or equivalent.

There is actually a third option. If you're going to grow with HID lights, you can get an air-cooled hood (which you'd want to do regardless in most cases), use duct to draw outside air through the hood, then exhausting the air back outside. The advantage to this is that you are isolating the grow room air from the heat caused by the light. You need two fans to do this. One for the hood, and one for the tent, which you will still need to vent. This is how I've got mine set up. I use a 6" fan for the hood, and a 4" fan for the tent. I run a 1000w in my 4x4 tent, and most of the time I need to use the heat from the hood to help warm the room.

Check out my Grow Room thread below to see how I've got mine set up.
Click to expand...
180404Hindu-Kush.jpg
 
FirstTimeGrwrLngTmSmkr

FirstTimeGrwrLngTmSmkr

Active Member
I have 4 of these lights I'm running 2 at the moment and I will be getting the tubing and fans ASAP..theres a window in the room and I will be running the vent tubing from thay window to the reflector and out the other side. There is a big enough space to put it tubing between the floor upstairs and the ceiling in the room. I think it's going to be a good deal because the windows are parallel to each other and my grow space is in between .. I just have to research more to figure out how to set it up for the 4 CMh315 reflectors and how powerful of a fan I need... thanks for your help
 
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