Ventilation setup design feedback

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windsurfer420

Member
Hey all, just wondering what the best way to set my ventilation up is. I have a 4' x 4' veg room (400 watt MH) and a 8' x 4' (2x 600 Watt HPS) flower room. The lights all have air cooled reflectors and I will be using a carbon filter. I was wondering if anyone has tried a similar setup to the one I drew up below. Will this work? I am trying to keep costs down by not using too many fans. Will using a Y duct adapter with a 440 CFM inline fan (with speed controller) work to ventilate both rooms? The flower room will also be intaking the air from the veg room to filter that air as well (the strains I am using produce some odor during vegging) with a 110 CFM bathroom exhaust. Will the carbon filter work effectively if put inbetween the 2x 600 watt lights with an adapter? I would use a 720 CFM inline fan to pull the air through the lights and 440 CFM rater carbon filter.

Will this setup work? Do you have better ideas? Check out my drawing and give me some feedback.

Thanks!

12033.jpg
 
K

keyman

Well-Known Member
windsurfer420 said:
Hey all, just wondering what the best way to set my ventilation up is. I have a 4' x 4' veg room (400 watt MH) and a 8' x 4' (2x 600 Watt HPS) flower room. The lights all have air cooled reflectors and I will be using a carbon filter. I was wondering if anyone has tried a similar setup to the one I drew up below. Will this work? I am trying to keep costs down by not using too many fans. Will using a Y duct adapter with a 440 CFM inline fan (with speed controller) work to ventilate both rooms? The flower room will also be intaking the air from the veg room to filter that air as well (the strains I am using produce some odor during vegging) with a 110 CFM bathroom exhaust. Will the carbon filter work effectively if put inbetween the 2x 600 watt lights with an adapter? I would use a 720 CFM inline fan to pull the air through the lights and 440 CFM rater carbon filter.

Will this setup work? Do you have better ideas? Check out my drawing and give me some feedback.

Thanks!

View attachment 2390207
Click to expand...
I would worry you would be getting to much / or little out of the filter off of that branch (unless you had a damper to regulate it)
Might i Suggest just using passive air intake at the far end by the 400w and keeping it as-is but move the filter next to the 720 so the 720 and 440 are right next to each other pulling air out.
the 720 through the lights and the 440 through the filter and you keep the 110 as is so the 440 dont have to pull so hard. you omit the y adapter. make sense or no? :idea:
 
K

keyman

Well-Known Member
Based on the dimensions of those spaces, the 440cfm fan would draw passive air in the small room from any opening and pull it all the way through the other room even with a filter but its gonna cut down the amount of draw that 440cfm can pull. with 3 lights running even cooled is still gonna produce some heat so I would say the more air moving around the better. IMHO keep the 110cfm going, you can always take it out.
 
K

keyman

Well-Known Member
windsurfer420 said:
How about this? View attachment 2390442
Click to expand...
you are still not gonna be able to control the airflow without a damper and the fan is gonna draw from the path of least resistance. it may work but to go through all that work setting it up and then find out its 95 deg in there or they start stinkin to high heaven kinda sucks. IMO drop the air intake in the large area and move the intake over to the far side of the 4X4 so it has to draw straight across the whole area. Connect the 440 to the filter ALONE and that provides the air flow for the grow space.
 
M

MrMeanGreen

Active Member
keyman said:
you are still not gonna be able to control the airflow without a damper and the fan is gonna draw from the path of least resistance. it may work but to go through all that work setting it up and then find out its 95 deg in there or they start stinkin to high heaven kinda sucks. IMO drop the air intake in the large area and move the intake over to the far side of the 4X4 so it has to draw straight across the whole area. Connect the 440 to the filter ALONE and that provides the air flow for the grow space.
Click to expand...
Good point, wot dat man says.

Also, OP, ya wont get away with just 1 fan and a Y on the filter and hoods. Ya need a fan for both, if ya can, stick a 720 cfm on the hoods and vent back into ya house if ya can. Plumes of hot air firing out of your roof under pressure will make you bait to the copters.
 
W

windsurfer420

Member
Okay, thanks a lot MrMeanGreen and Keyman! Rep + for both :)
I think I'll go with the 720 CFM for hoods and then just put down the extra money and buy 2x 440 CFM and a 440 carbon filter. I'll use passive air intakes to connect the veg and flower room and intake through the veg room like you said. I like the idea of having no bends in any of the ducting. I'll post some pictures when everything is set up.

Cheers.
 
Mr.J420

Mr.J420

Well-Known Member
I've never had any benefits from running an intake fan, all passive intakes = less smell almost all the time. You can try to use the 720cfm fan to push air through your lights rather than pull.
 
K

keyman

Well-Known Member
Mr.J420 said:
I've never had any benefits from running an intake fan, all passive intakes = less smell almost all the time. You can try to use the 720cfm fan to push air through your lights rather than pull.
Click to expand...
good point, less chance of sucking in odor through the hoods if you are pushing air threw em.
 
W

windsurfer420

Member
I think I'd rather pull through, the hoods I have are pretty good quality and I have an unlimited supply of filament tape and tuck tape from work :) So I can always seal up if I notice anything
 
W

windsurfer420

Member
How big would the passive intake vents need to be if I didn't use an intake fan? Would it be better to use an intake fan with a DIY particle filter attached?
 
X

xscottrox

Member
You should have positive pressure on your lights, not negative pressure. So you should blow them instead of suck through them. You should have an intake filter to help reduce contaminents in the air. The cleaner your room is the less problems you will have with bugs, mildew, and stuff. If you want to use a passive intake you can buy carbon filters from grainger industrial supply. like this one here http://www.grainger.com/Grainger/AIR-HANDLER-Carbon-Impregnated-Filter-6B886?Pid=search.
 
oldschooltofu

oldschooltofu

Well-Known Member
yea pull the air through

use one fan for just your lights (run when lights are on)
use one fan for just your carbon filter (have this come on when humidity is high) make sure this air doesnt get circulated back into room.

i am going to be running almost the same set up 4x4 veg w/ 4x8 flower this year.
 
W

windsurfer420

Member
Okay, thanks oldschooltofu. So would you use a 440 CFM for carbon filter, 720 CFM for lights and then a 440 CFM for intake from veg room?
 
wheels619

wheels619

Well-Known Member
here is the deal dude. u have to have back pressure on the filter for it to work. the filter has to be under load from the fan and if u have an open end on the y connector running thru the lights u wont even be using the filter becuz the air will take the path of least resistance. it should be 400>600>600>720cfm fan then u should have a separate fan running the intake. and another fan just for the exhaust of the filter. or run the 2 600s on the 720cfm with the filter and the 400 on the 6inch fan use both for exhaust. u only have enough fans to set it up properly for passive airflow. u would need another 6 inch to make it none passive and to turn it into inductive.word looks like it doesnt fit. lmao. why doesnt that word sound wrong. hmm. to much wake and bake.

set it up like this. lights to 720 cfm and then have the 440 hooked up to the filter for the time being. also make sure u have no light leaks.
 
wheels619

wheels619

Well-Known Member
Mr.J420 said:
I've never had any benefits from running an intake fan, all passive intakes = less smell almost all the time. You can try to use the 720cfm fan to push air through your lights rather than pull.
Click to expand...
fans work more efficiently if u use them to suck instead of blow. pulling takes less effort than pushing.
 
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