air exchange at night

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toker89

Member
i am a bit puzzled about how to do this. i understand air exchange is important for healthy plants. i run a 400cfm inline 24/7 at low-speed to do it. this has probably cost me a little more in electricity but i don't care if it gets the job done. i'm wondering if other people do the same with a passive air intake system? is it smarter to put the fan on a timer so it only works at certain intervals, thus saving energy? I was thinking about that but i'm not sure if it would be worse for my fan's lifespan.

i have a timer but it's not in use right now, i'm waiting until i switch to MH/HPS. I was wondering how common it is to run 2 separate timers, one for the lights to run 18/6 or 12/12 or whatever, and one for a big fan like mine to exchange air.

what do you think is the most effective (and safe) way to do this? thanks
 
T

toker89

Member
JayJammer said:
So your fan is being used to exhaust your room 24/7 ? How large is your room?
Click to expand...
yes. my 6" inline fan is constantly on pulling air out of a 4x4x8 room and bringing fresh air in through a couple passive air intakes. there is also an oscillating fan inside blowing at the plants. if i turn off the inline fan it gets pretty warm (80+ degrees) and i'm still using fluoros.

the inline fan is going to be running at a much higher speed when i switch over to a MH/HPS lamp though and i'm worried it will get too cold at night if its still running when the light is off, thats why i was wondering if its common to put the fans on a separate timer than the MH/HPS ballast, wat do you guys think?
 
mnmobbin

mnmobbin

Well-Known Member
I personly do and would recomend running all your fans 24/7. I run a 600w air cooled hood and a 4" fan/filter combo along with two 6" clip on fans in my 4x4 tent. I got it pretty dialed in now lights on temps 77-80 lights off I let it drop to 69-70.

I do run a 8k portable ac in the room so the ambients about 77. But thats required due to no central air in my house.
 
calicat

calicat

Well-Known Member
toker89 said:
i am a bit puzzled about how to do this. i understand air exchange is important for healthy plants. i run a 400cfm inline 24/7 at low-speed to do it. this has probably cost me a little more in electricity but i don't care if it gets the job done. i'm wondering if other people do the same with a passive air intake system? is it smarter to put the fan on a timer so it only works at certain intervals, thus saving energy? I was thinking about that but i'm not sure if it would be worse for my fan's lifespan.

i have a timer but it's not in use right now, i'm waiting until i switch to MH/HPS. I was wondering how common it is to run 2 separate timers, one for the lights to run 18/6 or 12/12 or whatever, and one for a big fan like mine to exchange air.

what do you think is the most effective (and safe) way to do this? thanks
Click to expand...
I use multiple timers for all my grow appliances. Just remember to check them regularly for they can malfunction. I personally dont run my intake 24/7 or my exhaust 24/7 they run about 18-20 hours.
 
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