Is this setup viable??? (Negative Pressure)

[Daithy]

Hi, let's make this quick instead of long articles.

I'm a noob. I have my current grow in soil, just one light one room (room is quite spacious". I might wanna upgrade to consecutive grow if I attain some capital in the near future. Here is what I wanna do:


I have a room with one window, unfortunately there is no other outlet in the room, and I cannot cut in the walls to lead out to chimney or attic — rented accommodation :\. Thus, I need to opt in for Negative Pressure room. For a long time I was thinking how to divide my room into sections without modifying the premise, then enlightenment shone upon me , but it will be costly .

I want to have consecutive grow, Clones; Veg, Flower. To achieve that I will use 3 tents. I will be using aero/nft systems for everything. Here is my basic idea; I am terrible at drawing. Please tell me if its viable or not, and point out my mistakes please. Thanks everyone.

 

[Daithy]

The door will be completely closed or slightly opened. What happens if the pull if much greater than the supply of air? Is it a problem? I would like to have this particular question answered by someone who actually has grown in Negative Pressure instead of theories, thanks.

 

[Horsetooth]

You are going to need one (I'm going to recommend two) inline booster fans to create enough negative pressure through all three rooms. That door will need to be propped open or it will close from the pressure and then the setup is not going to be efficient from my experience.

 

[Horsetooth]

The straighter you can get that ducting the better. Curves create dead air which will also affect efficiency.

 

[Horsetooth]

One last thing: fuck yes perpetual grow!!!!:thumbup:

 

[Daithy]

The straighter you can get that ducting the better. Curves create dead air which will also affect efficiency.

Hi, thanks for the reply. So you reckon that one strong inline fan won't cut? I am afraid of the noise as well..I'm gonna have to look up the booster fans as I don't know what they are. Would they be the same as the main one? You see, I wanna pull through the carbon filter. I have heard that you cannot blow into them.

 

[JohnDee]

Daithy,
The carbon scrubbers I have used only have one duct connection. Not designed for inline installation like your picture. And besides...they wouldn't even work that way.
JD

 

[althor]

I use a duct T turned upside down with activated carbon from the pet store. Tape off the upside down I part and let the air flow through the - part with screen on both sides (so the carbon doesnt blow out) and works like a champ.

 

[FilthyFletch]

You could just use 5 mil black plastic, then get a roll of velcro with sticky backing and then so simple stick on zipper packs. You put the sticky backed velcro on the ceiling to "frame" the areas. Then cut the plastic to length as it will be the walls. Put the other velcro side on the edge of the plastic and then just stick it to the velcro on the ceiling basically forming the walls. Now you get the temp zipers which are sticky backed place it where you want you doors stick it on the plastic walls then unzip use a blade slice between the open zipper and you now have rooms with doors and at most you might need to repaint the ceiling if the velcro peels any paint off. Maybe put a few staple into the velcro on the ceiling for better hold. Cost for setup under $100 and almost no noticeable damage.

 

[hazey grapes]

i would put the flowering room at the start of your chain to keep that one the coolest as the rest of your rooms would be = pressure as your cooling air passes through your system with no "suction" in the room to pull air out, but the open end of your system would be where all of your negative pressure is.

maybe, if you want your system to pull fresh air into your tents as well as through your lights, you should use T connectors for your plumbing so each room has an OPEN intake drawing air in.

there's no negative pressure in your "pass through" rooms in your original design

 

[Daithy]

i would put the flowering room at the start of your chain to keep that one the coolest as the rest of your rooms would be = pressure as your cooling air passes through your system with no "suction" in the room to pull air out, but the open end of your system would be where all of your negative pressure is.

maybe, if you want your system to pull fresh air into your tents as well as through your lights, you should use T connectors for your plumbing so each room has an OPEN intake drawing air in.

there's no negative pressure in your "pass through" rooms in your original design

But the Inline Fan is closest to the flowering room, and besides the Flowering room will have highest RH, that's why I don't wanna have it 1st, to avoid dragging all the humidity through all the tents.