2 birds with 1 stone?

Going to purchase a cooltube for my 600w hps. Would it be possible to add a tee shaped duct connector and extract the heat from the room as well as the cooltube. The fan i was looking at "Will move up to 365m3/hour (101 l/second) of air." Room size is 8ft x 6ft x 6ft high

Here's a quick sketch in paint to show ya what i'm trying to describe lol...

No that is a bad idea, just leave the end of the cool tube open instead of using that tee
Don't connect the cool tube to outside of the tent on the right hand side like you have in that pic, just leave the right side open and it will take out the heat in the tent as well

I think the heat is expelled quicker when you have the fan blowing into the light fixture. The sucking doesn't make sense whwn you think about it. The heat is constantly being emitted. If the fan is right there where the light is, there is 100% of the air being used to expel the heat. Positive flow instead of negative flow makes complete sense to me. Additionally, there is intake air being utilized as well that is cooler and more available when the fan blows into the light rather than the sucking only action.

stoneruk said:

Going to purchase a cooltube for my 600w hps. Would it be possible to add a tee shaped duct connector and extract the heat from the room as well as the cooltube. The fan i was looking at "Will move up to 365m3/hour (101 l/second) of air." Room size is 8ft x 6ft x 6ft high

Here's a quick sketch in paint to show ya what i'm trying to describe lol...

Click to expand...

I'd stick a CAN filter on end of cool tube that's what I do.

Sucking is preferred, some people like to blow

tom__420 said:

No that is a bad idea, just leave the end of the cool tube open instead of using that tee
Don't connect the cool tube to outside of the tent on the right hand side like you have in that pic, just leave the right side open and it will take out the heat in the tent as well

Click to expand...

Agreed. Do what he said.

Yeah I would stick a carbon filter on the open end during flowering though so that there will not be any bad smells exhausted outside of the op

tom__420 said:

No that is a bad idea, just leave the end of the cool tube open instead of using that tee
Don't connect the cool tube to outside of the tent on the right hand side like you have in that pic, just leave the right side open and it will take out the heat in the tent as well

Click to expand...

I see what you're saying but i was thinking about getting fresh air in, it's an outdoor shed i'm growing in...Maybe do it the way you're saying just a grill on the bottom of the shed to intake fresh air without any linking ducting?

Ole Budheavy said:

I think the heat is expelled quicker when you have the fan blowing into the light fixture. The sucking doesn't make sense whwn you think about it. The heat is constantly being emitted. If the fan is right there where the light is, there is 100% of the air being used to expel the heat. Positive flow instead of negative flow makes complete sense to me. Additionally, there is intake air being utilized as well that is cooler and more available when the fan blows into the light rather than the sucking only action.

Click to expand...

I thought about that but couldn't see how sucking would be less effective to blowing, fresh air would still go through the cooltube at the same rate in the same direction, unless the fan would actually be cooling the air down while it goes through it?any ideas?

golddog said:

I'd stick a CAN filter on end of cool tube that's what I do.

Sucking is preferred, some people like to blow

Click to expand...

Not really fussed on the smell of it m8, not many neighbours to complain lol

Would it make more sense to just get a separate inline fan to expel warm air out of the actual room?

Use the fan that will be pulling through the cool tube and carbon filter to make a negative pressure in the cab and use passive intake holes

Ole Budheavy said:

I think the heat is expelled quicker when you have the fan blowing into the light fixture. The sucking doesn't make sense whwn you think about it. The heat is constantly being emitted. If the fan is right there where the light is, there is 100% of the air being used to expel the heat. Positive flow instead of negative flow makes complete sense to me. Additionally, there is intake air being utilized as well that is cooler and more available when the fan blows into the light rather than the sucking only action.

Click to expand...

wrong.
negative pressure is more efficient at moving volumes of air than positive pressure through a duct system.
positive pressure creates back pressure, which in turns causes cavitation of the fan blades, reducing the effectivness of the fans ability to move air at a rate proportionate to the volume of air being moved... in other words, the more air you try to push, the effectivness of the fan decreases.

always use negative pressure (sucking) to remove heat

this principle is demonstrated very simply with a drinking straw...... its harder to blow out the straw than suck through it.

stoneruk said:

Going to purchase a cooltube for my 600w hps. Would it be possible to add a tee shaped duct connector and extract the heat from the room as well as the cooltube. The fan i was looking at "Will move up to 365m3/hour (101 l/second) of air." Room size is 8ft x 6ft x 6ft high

Here's a quick sketch in paint to show ya what i'm trying to describe lol...

Click to expand...

thats whats called a fire trap......
get rid of the tee altogether, remove the duct going from the cool tube to outside air, and allow the van to exhaust air from the cab, via the cooltube

stoneruk said:

I see what you're saying but i was thinking about getting fresh air in, it's an outdoor shed i'm growing in...Maybe do it the way you're saying just a grill on the bottom of the shed to intake fresh air without any linking ducting?



I thought about that but couldn't see how sucking would be less effective to blowing, fresh air would still go through the cooltube at the same rate in the same direction, unless the fan would actually be cooling the air down while it goes through it?any ideas?



Not really fussed on the smell of it m8, not many neighbours to complain lol

Would it make more sense to just get a separate inline fan to expel warm air out of the actual room?

Click to expand...

I did a couple grows in my shed. It was an experience. I could barely stand up the peak, plus I had my plants on a table that took away from how high the plants could get too. Anyway, I cut a hole in my shed, about waist high to avoid bugs down low and ones up high that like eves. I put two air conditioner registers over the hole, one on each side and a water heater filter in between. It gave me a good light seal and worked well for keeping the bugs out. I would put some thought into the location of this hole, prolly on the opposite side of the room from were the air will be pulled from. This will give it an opportunity to automatically circulate in the room. If you put it right by the air out the air will come in and go out without influencing the environment of the room to much if at all, then again this may be what you want if you are running Co2. If you move too much air through your room you will prolly be removing alot of Co2.

I would also leave the cool tube open. That will pull fresh air in from the hole you cut and suck hot air out because heat rises so it will be up were the lights are, plus it will cool your lights too.

You can always duct your fresh air in, even if there is not a fan on that line you can still put a duct over the hole and put it where you want it. The fan pulling air through the cool tube will provide enough suction to bring the fresh air in.

Cheers for all the replies lads. Looks like i'll be going with an open ended cooltube w/inline fan sucking air out of other end and exhausting it, also intake vent at bottom of shed.

Why put the passive vent at the bottem? Cool air sinks as does c02, it makes more sence to have the vent at least above 1/2 way up the wall and let air sink down on your plants...

The fan will be pulling the air up over the plants and out of the tent
If they are as low as possible it will bring in the coldest air and allow it be pulled through the entire plant(s)