Cooltube, blow or suck?

i like using the fan to pull the hot air out of the room thru the light.. but it is best to have a smaller fan to blow cool air into the room. i use an 8" inline for exhaust and a small 4" inline for the inlet works magically

oh! and also your light should never get to 140 so no worries on damaging the fan.. but good idea to use a few feet of flex duct between light and fan just to make adjusting your light hight easier

I would rather blow air over it, id rather not take a chance of a broken bulb shattering and getting sucked up into my nice fan. that would be a mess,

amnooneoo said:

I would rather blow air over it, id rather not take a chance of a broken bulb shattering and getting sucked up into my nice fan. that would be a mess,

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yea that would be all bad getting glass in your fan, but the oods of that happening are slim to none just dont be careless.. facts is facts man a good suck is better than a blow anyday

whynot said:

The air won't be too hot on the fan motor doing it that way? Just worried about the fan failing due to heat. They say not to expose the fan motor to more than 140 degrees F. Should the fan be a certain distance from the bulb?

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I would just flip your fan around right where it is now. The air coming through the fan will be around the same temp. as your ambient room temp. due to the bulb being cool from the air passing over it.

you want fresh air coming in low if u are sucking air out also so you'd want to suck at the light and have the input coming in lower i wouldnt hook the in and out to the light tho cuz it wouldnt get enough down to the plants unless u are blowing way more than u are sucking. i have just my vegg room going now with no smell yet but when i get my bloom room together i will have air from an inline fan vent sucking from vegg to bloom and than a good blower fan to suck from the light in the bloom room and blow out to a self made carbon filter into the room and so on

I'm going to leave it like it is for now. It's running 79.5 degrees now, and the cooler season is upon us which is good. But reversing the flow of the fan will cool it even more? That may come in handy later on. Would 2 of these fans, one before and after be any better?

reggaerican said:

yea that would be all bad getting glass in your fan, but the oods of that happening are slim to none just dont be careless.. facts is facts man a good suck is better than a blow anyday

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I agree, and I am safe as possible and do not water inside my box. Just an extra precaution some of us take, if it can happen, it will happen to me, lmao.

Man this is a funny thread. Cooling is about airflow and it shouldn't matter wheather your sucking or blowing, it's the same amount of cfm for the entire hose run (but where the bends in your ducting do make a huge diff)

The funniest thing is people that have an outlet fan to there room and then also install an inlet fan. If you blow air out of a closed space you create negative pressure and air will move into the space on it's own. It would actually be better to have only an inlet fan down low that would create positive pressure and a passive outlet up high that hot air would be pushed out of. That way air from inside your walls and building shell that could contain mold spores and insect eggs would not be sucked into your room donto the negative pressure. I conducted a blower door test on my house and you would be amazed at how much air leaks into your house from outlets, light switches, and exhaust fans.

If your using the rubberized dryer hose for your vents and still need more flow, pick up some of the aluminium flexy hose, lot less resistance to flow.
Cheers

i read i jorge cervantes horticulture book that its way more efficient for a fan to suck than to blow,i have no idea why,but i take him on his word..my self running filter>cooltube>fan>out no problem but always open for advices,but now isnt the heat a veary big problem in norway any howhave to use a heater at night..