review my ventilation system

trying something new here and wanted to ask if anyone sees a problem..

creating hybrid flower/veg rooms that have traditional active intake and exhaust fans as well as co2 generators and split ac.
so traditional combined with CGE sealed room.


as you can see in the picture both rooms pull cold fresh air from an open window (pink area)..
they exhaust the hot air on the far end (see red arrows)
that is a 20foot duct run on the veg exhaust so maybe ill use two 8in fans...
am thinking of using back draft dampeners on intakes..

also looking at keeping my water tanks in the same space as i pull fresh air.. (pink area)
it would be a great space to store my water tanks out of the way.. curious about unintended issues there tho?

also would need to sort out something so when im mixing my nutes and the flower/veg room door is open, the HID light won't fly out the open window.
part of the reason i made that whole pink area instead of a window box was the convenience of some space between outside light, veg and flower light..

just realized I could add a wall before the water tanks.. allowing access for the intake fans to window air.. and blocking light/air from entering water tank zone..

having two intake fans pulling from the same space/window shouldn't be a problem?

i would like to find a way to avoid heating during "lights off" something like exhausting veg room heat into flower room (instead of blowing outside)
but i think there would be positive pressure issues? anything im missing before I finish this build?

Looks good to me. I've tried fans inline and wasn't impressed. I'd say just up it to a 10".

Just a tip, sliding pocket doors can be very handy.

Renfro said:

Just a tip, sliding pocket doors can be very handy.

Click to expand...

I love the concept of pocket doors and wish i could make them work...
but I am looking for strong sealing entry ways that can keep as much light and air from spillling as possible and I have had no luck getting that with pocket doors.

SnoopyDoo said:

Looks good to me. I've tried fans inline and wasn't impressed. I'd say just up it to a 10".

Click to expand...

cool, thanks ya i've never used multiple inline fans, inline... but i have a 10" and 12" floating around so i will consider using them..

I was looking at how the intake fans are kind of lined up to where they might be "fighting" each other for air...
should i create some way of separating them? a lil duct so they are few feet apart?
maybe dampeners before the fan?

open window--dampeners--intake fan--room

2cents. Your intake air size needs to be 2x times the size of your exhaust output size otherwise your setup will be trying to pull air thru door cracks and other places other than your lung room intake.
You want 100% positive pressure in your veg/flower rooms anytime air in being brought In or exshausted. ( I would build an appropriate sized hepa filter w/prefilter and UV in your incoming air lung room. Set it up to push air into your veg/flower rooms ) again only positive pressure in your growing rooms. I would personally split your lung room and build the incoming hepa filter s on both. Just alot easier than trying to balance both fans or one trying to over come the other...

1. Your only pulling air thru hepa so no worries about mold spores being drawn in.

2cents