Cooling question

Will my 440 cfm inline fan be able to keep a 400 and 1000 watt in cooltubes both in separate tents at temp?

it depends on your ambient temps but it is unlikely 1 fan will effectively cool both tents. i have a room with 2 600w hps lights and to keep my temps below 80 i have a 440cfm fan cooling the lights and another 440cfm exhausting hot air from the room with a carbon filter. i also have a 4x4 tent with a 600w hps and it take a 400cfm fan to cool the light and another 200cfm fan/carbon filter to keep my temps where i like them. but like i said your ambient temps will make a huge difference, and the absolute best you do no matter how many fans you have is run 4 or 5 degrees above ambient.

Is it better to have a seperate fan for intake? I usually just have one fan taking hot air from the tent and light. Sucks in air thru some side vents that is has? Should I invest in an intake fan. 4x4 with a 1000watt hps

4x4 with 1000w? i would have 1 fan cooling the light (so you will have in this order: tent wall, flexduct, aircooled hood, flexduct, 440cfm fan, flexduct, tent wall) and one fan exhausting the air from the tent through a carbon filter and run passive intakes (just leave an intake hole or 2 open) and the negative pressure generated by the exhaust fan will take care of everything. remove air from the top of the tent (heat rises) and have passive intakes near the floor (cold air falls). this is the most efficient way to cool a space via airflow. the fan that cools the light can be set on the same timer as the light itself, and a fan speed controller on the exhaust fan will give you some control over the temps. i have the same setup with a 600w and i have total control of my temps. you can take a look at it in the link in my sig.

What everyone above has said is true but you can easily run both lights on a single fan. It will be a straight through setup and expelled air is clean so can go into house if required. You will require the following...

1. both tents next to each other (vent holes matching) so you can run the shortest duct directly from light 1 to light 2.
2. duct the open end of light 1 out of the tent.
3. place your fan on open end of light 2 then duct out of the tent. (No dirty air)
4. Set your light timers in tent 1 opposite to tent 2. eg tent 1 runs 6am to 6pm and tent 2 runs 6pm to 6am.

so effectively you will only ever be cooling 1 bulb. Efficiency will obviously drop if there is any overlap, you might have one tent running 18/6 (veg).

Your will still need to scrub air within the tent but you can a similar technique to service both tents with 1 fan and filter.

MrMeanGreen thanks for that advise. That's exactly what I'm ganna do now. I have a 4x4 and a 6x4 for flower and I have a spot where I will have veging, clones and mothers under some t5 or whatever they call them.

What strains would u guys recommend for that set up.

I would say the 440 will just cover the two if you can keep them in line and with minimum curves.

I would recommend pulling air from out doors, with an intake filter, then dumping the air outdoors. Zero indoor air used in the aircool circuit.

Masterogkush said:

What strains would u guys recommend for that set up.

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way too many out there bro... i like tga and i have actually had nice results from nirvana (only 1 strain, wonder woman). i had a negative experience with green house seeds.

HeartlandHank said:

I would say the 440 will just cover the two if you can keep them in line and with minimum curves.

I would recommend pulling air from out doors, with an intake filter, then dumping the air outdoors. Zero indoor air used in the aircool circuit.

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I would respectfully disagree unless the IR helicopter isn't an issue. I would advise never to vent any hot air directly outdoors, pure bait especially in the winter. If possible try to vent your heat into the house. Ya growing nothing if you get caught.

Dose the fan have to be on the inside of the rent or can I place it on the outside?

Masterogkush said:

Will my 440 cfm inline fan be able to keep a 400 and 1000 watt in cooltubes both in separate tents at temp?

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OH hell yes. My 440 takes care of my 1000w in a vented hood and can easily take care of another 400. If they are in separate tents, your golden man.

My fan is inside the tent, it is hooked to a 6x24" filter, runs through the hood and then outside.

Placement of the fan, you might not think about this now, but, if you run your ducting out a window or something, it will be a huge flashlight. If you put your fan in between the light and wall penetration, the flashlight will be blocked. Something to consider if venting outside and deciding on where to place your fan.

Masterogkush said:

Dose the fan have to be on the inside of the rent or can I place it on the outside?

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i keep my fans outside the tent now, it has zero impact on cooling but does free up some space inside the tent

I think I might put the fan inside after light two to see if it will bring the noise level down a lil I usually had it outside. Also where should I have my exhaust in the tent top or bottom? Ima have a fan with a Y exhaust from both tents. And u guys think its a bad idea to exhaust all that to the outside of the house?

Is there I way I can get rid if those long ass post dude posted? Or should I read it. Doesn't sound like anything useful?

Do u guys top or lst. Or just let them grow. I've done lst with really good results.

MrMeanGreen said:

I would respectfully disagree unless the IR helicopter isn't an issue. I would advise never to vent any hot air directly outdoors, pure bait especially in the winter. If possible try to vent your heat into the house. Ya growing nothing if you get caught.

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If you are worried about it, flower during the day time. FLIR is useless during the day. If someone is flying over your house with FLIR, you have been watched for a little bit and will be busted regardless.
Reading IR from a helicopter is not as simple as flying over a neighborhood and writing down addresses. It doesn't look anything like the advertisements for IR blocking material would like you to believe.

A tinfoil hat will keep the thought monsters away. .

Masterogkush said:

Do u guys top or lst. Or just let them grow. I've done lst with really good results.

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It just depends on the genetics. I have not topped a flowering plant in a very long time. I like LST or leave it be.

I like my Super Silver Haze, Northern Lights and 12-14wk Haze LST'd. I like(d) my Deep Chunk, Apollo 11, SPGrapefruit and Green Crack just grown like it wants to be... I cut out lower growth on the plants regardless.

Masterogkush said:

I think I might put the fan inside after light two to see if it will bring the noise level down a lil I usually had it outside. Also where should I have my exhaust in the tent top or bottom? Ima have a fan with a Y exhaust from both tents. And u guys think its a bad idea to exhaust all that to the outside of the house?

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Keep the fan in the attic, sit it on some foam, wrap in insulation if you want..

If you get the itch to invest in the future... buy fans larger than your needs... plug it in to a speed adjuster... a 700cfm fan ran at 50% is much much more quite than a 350 cfm on full power. Duct reducers will get you around any duct size issues. couple this with the attic and you will probably not even be able to hear anything at all.

You will see the best results from bringing in fresh outdoor air (passive or active) and exhausting it outdoors... if exhausting out of your home will keep you from sleeping at night... then come up with a creative solution... anti anxiety meds are not a bad option.