Hey rollers!
Long time lurker, new grow and a new account!
So I'm planning to redo my entire grow area, I've done 2 successfull grows in this area but with a very low effort setup which in turn made it pretty difficult to work in it. I'm going to change things up to make it more streamlined and alot easier to work with. I would love for any feedback that you may have!
First let me explain the picture I've attached. The hollow square on the right is the entrance to an attic space. The posts are the trusses (there are more, I've just drawn up the important ones), the red arrows are where I have intended to have the warm air exit and the blue arrows are where I have intended to have cool air coming in. The top side exits will only be used if necessary.
The dimension of the entire grow area (within the posts) is 9,4 meter length, 2,2 meter wide and the height up to the ridge is 2,35 meter. Slanted roof though so the entire height can't be used.
My plan is like this;
Flower room - 3x 1x1m hydro trays running E&F, SOG style growing due to the limited height available. (May only be 2 trays depending on how it looks when I actually start to assemble stuff)
Veg room - 6x flower plants, 3 different strains. (May only be 4 mother plants depending on how it looks). Not sure which route to go with the mother plants yet, looking at DWC. Ideas?
Ventilation - The direction of ventilation will be from left to right. 2x filters from flower room, 1x filter from veg and probably 2x filters on the warm air exit holes on the right. There will be an AC unit directly below the "entry square", kind of making the lower floor a lung room. I will mainly rely on passive intakes on the holes with the blue arrows, thinking that I'll need one active in the flower room though. One of the intakes in the veg room will probably have a T-connector so that both the flower and the veg room will have access to passive intakes from that one.
The ventilation part is the one that I'm the most insecure about. I have no idea how to actually do any real calculations on how much airflow I need to keep negative pressure and exchange the air in there sufficiently. The holes in the floor will have a diameter of 125mm. It's worth mentioning that the grow area isn't sealed so if the holes aren't allowing the exact amount of air intake there will still be air coming in from other places, ideally as much as possible goes by the AC unit though. Any and all feedback is most appreciated here!
Smell is important to keep really low so I will be running 2 filters from the flower room and 1 from veg. If needed I can add another filter in each room that scrubs the air but doesn't exhaust it anywhere.
Thanks in advance for any help you guys can provide!
Long time lurker, new grow and a new account!

So I'm planning to redo my entire grow area, I've done 2 successfull grows in this area but with a very low effort setup which in turn made it pretty difficult to work in it. I'm going to change things up to make it more streamlined and alot easier to work with. I would love for any feedback that you may have!
First let me explain the picture I've attached. The hollow square on the right is the entrance to an attic space. The posts are the trusses (there are more, I've just drawn up the important ones), the red arrows are where I have intended to have the warm air exit and the blue arrows are where I have intended to have cool air coming in. The top side exits will only be used if necessary.
The dimension of the entire grow area (within the posts) is 9,4 meter length, 2,2 meter wide and the height up to the ridge is 2,35 meter. Slanted roof though so the entire height can't be used.
My plan is like this;
Flower room - 3x 1x1m hydro trays running E&F, SOG style growing due to the limited height available. (May only be 2 trays depending on how it looks when I actually start to assemble stuff)
Veg room - 6x flower plants, 3 different strains. (May only be 4 mother plants depending on how it looks). Not sure which route to go with the mother plants yet, looking at DWC. Ideas?
Ventilation - The direction of ventilation will be from left to right. 2x filters from flower room, 1x filter from veg and probably 2x filters on the warm air exit holes on the right. There will be an AC unit directly below the "entry square", kind of making the lower floor a lung room. I will mainly rely on passive intakes on the holes with the blue arrows, thinking that I'll need one active in the flower room though. One of the intakes in the veg room will probably have a T-connector so that both the flower and the veg room will have access to passive intakes from that one.
The ventilation part is the one that I'm the most insecure about. I have no idea how to actually do any real calculations on how much airflow I need to keep negative pressure and exchange the air in there sufficiently. The holes in the floor will have a diameter of 125mm. It's worth mentioning that the grow area isn't sealed so if the holes aren't allowing the exact amount of air intake there will still be air coming in from other places, ideally as much as possible goes by the AC unit though. Any and all feedback is most appreciated here!
Smell is important to keep really low so I will be running 2 filters from the flower room and 1 from veg. If needed I can add another filter in each room that scrubs the air but doesn't exhaust it anywhere.
Thanks in advance for any help you guys can provide!