Ventilation advice.

[sir_dubington]

So recently I purchased two of the nanolux 630w cmh and I am loving them. im getting about half the coverage as I did out of my 1000w hps but that 2.5x2.5 area is looking much better then anything I ever did under hps. The trichome production is nuts. The problem is I used to air cool my 1000w hps and these are open hoods. I used to air cool each 1000w with a 340cfm inline fan each. They're the max fan with the built in speed controll and I never had it switched above two. The setup whent Carbon filter-cool
Tube-inline fan-exhaust and that more or less controlled my temps. My grow room is large. 14x10x8 feet for a total of 1120 cubic feet however I just set up two of the 630s for now and am using two separate areas about 3x3 each. I live in the desert and its July and you all know how that goes. Right now with 350cfm and open hood one light on puts my temp from its starting point of 72 to about 82 at the hottest part of lights on. My only passive intake is the houses central ac vent which pumps out cold air through most of the day as it is summer and the outside temps are 110. I really would like to get the second light up and running in the next couple days so my harvest times are 30-35 days offset. So my questions are.

Would a larger passive intake from an adjacent room greatly lower my temp or is the ac vent adequate?

Do you think I should Just vent with one 1000cfm 8 inch fan and use my 350cfm as an active Inlet?

Only a few grows in and this is my first time really tackling the summer months. A mini split is kinda out of the question right now as the cost is so high and the room is on a second floor.
Was considering a portable Evap cooler as my rh sits anywhere between 20-30 percent.

Hope I gave enough information. Any advice is welcome. I've learned everything I know from the mag. Thanks for reading

 

[FLAM4]

8'' extraction fan upgrade would be about right.

You could try running your extracting ducting tee'd and placed right next to the light hoods so the air gets pulled passed the hoods pulling a big percentage of the heat.

You will have to put your filter inline... pretty easy to just build a box and put your filter in it and duct at each end... or make a little lung room/ bigger box that also houses your fan.

 

[944s2]

if you want "piece of mind" then another option is to go oversize so a 10 inch or 12 inch but have a good fan controller and too much extraction wont end well,,
i use a big old 12inch boxed accoustic to look after 4 x600w,so i imagine a 10inch would be plenty,,,,as other poster wrote an 8inch should do the trick,,this is just another option,,
good luck op,,
peace and regards 944s2

 

[sir_dubington]

thanks guys this helps a lot! In gonna go for the big 10 inch and put a t on it hang it between each light so it sucks the air directly off each set of bulbs. Think ill be able to get away with just scrubbing the air in the room? Gonna need a big intake with a 10 inch fan huh?

 

[Snook]

So recently I purchased two of the nanolux 630w cmh and I am loving them. im getting about half the coverage as I did out of my 1000w hps but that 2.5x2.5 area is looking much better then anything I ever did under hps. The trichome production is nuts. The problem is I used to air cool my 1000w hps and these are open hoods. I used to air cool each 1000w with a 340cfm inline fan each. They're the max fan with the built in speed controll and I never had it switched above two. The setup whent Carbon filter-cool
Tube-inline fan-exhaust and that more or less controlled my temps. My grow room is large. 14x10x8 feet for a total of 1120 cubic feet however I just set up two of the 630s for now and am using two separate areas about 3x3 each. I live in the desert and its July and you all know how that goes. Right now with 350cfm and open hood one light on puts my temp from its starting point of 72 to about 82 at the hottest part of lights on. My only passive intake is the houses central ac vent which pumps out cold air through most of the day as it is summer and the outside temps are 110. I really would like to get the second light up and running in the next couple days so my harvest times are 30-35 days offset. So my questions are.

Would a larger passive intake from an adjacent room greatly lower my temp or is the ac vent adequate?
Yes, as long as the ambient temps in the room are adequately low (68*F-71*F or so)
Do you think I should Just vent with one 1000cfm 8 inch fan and use my 350cfm as an active Inlet?
Intake, passive, should be 2.5x the size of the exhaust, dono bout 1K in and 350 out, that would amount to positive pressure in the grow area..
Only a few grows in and this is my first time really tackling the summer months. A mini split is kinda out of the question right now as the cost is so high and the room is on a second floor.
Was considering a portable Evap cooler as my rh sits anywhere between 20-30 percent.
Commercial Grade humidifier -
https://www.amazon.com/Ideal-Air-700860-Humidifier-Commercial-Grade/dp/B00L2L3OXQ/161-3257120-7446825?ie=UTF8&SubscriptionId=AKIAILSHYYTFIVPWUY6Q&camp=2025&creative=165953&creativeASIN=B00L2L3OXQ&linkCode=xm2&tag=duckduckgo-d-20
Hope I gave enough information. Any advice is welcome. I've learned everything I know from the mag. Thanks for reading

Hello SD, I lived in Phoenix for a year and now live in FL. I'm in da heat too and feel your pain... here in FL I have to deal with to much RH, in the desert it was to low RH.. I over came the heat issue, here in FL, by cutting a hole in the wall to the garage and put in a window shaker, end of problem. There is a window in my room but putting one in it would have required explaining why I have a window ac in that window when I just had a new AC unit put in for the whole house. same as 2nd floor dilemma.. no window in there? You don't mention the possibility of a window AC.
The other thing I remember about Phoenix was it was so hot that keeping the thermostat at ??? 71*F would keep the ac running all day and never reach 71*F. Setting it at 80*F was just as cool to me but still 80*F. I'd think a swampcooler would take care of some of the RH problem. LEDs make me crazy..