Fans On or Off during Lights Out??

I have not been running my fans during "lights out" and I am growing in a closet where the only airflow is provided by fans. The only air that comes in is through the duct work during that time. Is this ok? I'm not like suffocating my plants for 6 hours or anything right??

I'm trying to figure out what happened to my seedlings and just trying cover all the bases.

Well Doco,

Why don't you run them 24hours and find out. So you think that 6 hours without fresh oxygen is okay? Hmmmm maybe plants are just a little different from people. Not too many thing survive without oxygen. If your seedlings were outside they have all the fresh air required.

Loco

Loco, a fan does not create oxygen. It just blows it around. You need to spend a little more for that feature.

Loco, I didn't realize that he was bringing fresh air in. My fault :(

I think to know for sure, you would have to take a reading and find out how much Co2 is inside when the lights are off. Maybe they are breathing ok if the temps good.

ok, but do you run your fans during dark periods in your grow room or cabinet?

doco, i run my exhaust 24 hrs. The fan to cool my light only runs when the light is on

the fan is good for 24-hour use, it strengthens the stems, and helps prevent mildew and molds ... good air circulation is vital ... :smokin:

Quote:

---

Originally Posted by locomark

Well Doco,

Why don't you run them 24hours and find out. So you think that 6 hours without fresh oxygen is okay? Hmmmm maybe plants are just a little different from people. Not too many thing survive without oxygen.

Loco

---

I also wasn't sure if i needed my vent fans on when lights are off.

When you turn the fans off there is a lot of O2 in the room, actually 21%. I can understand that CO2 would be depleted quickly if there wasn't ventilation because there is only a 0.035% concentration of CO2 in the atmosphere. so thats 600 times more oxygen. it wouldn't surprise me if the plants didn't use all that up in only 6 hours. other wise that means that the CO2 in a room would be used up in less than 0.6 min.

does anyone know...

If you guys are saying that the plants need lots of O2 then your wrong(they need Co2), but if your not sayin that then your right.

I believe plants dont use Co2 at night. It is only beneficial when a lot of light is being used and temperatures are high. That's what I read somewhere anyway in more that one piece of literature - but I could be wrong. Any one know difinitively.

TGT