Empty grow room 86f - way to hot?

Roger A. Shrubber said:

buy a 6 inch fan and run it at 1/2, or even 1/3 speed, it will be much quieter than a 4 inch running wide open. not going to say its silent, but it's at least a 50% noise reduction, probably more.
if you put the fan in a box with a couple of holes cut out for the exhaust hose, and pack some old clothes or towels around the fan in the box, that'll cut that noise by another 50%

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Tweak that a bit- fill that box w spray foam and once dry cut off the overflow w a saw- close box back up- rip at 100% pretty quiet and use insulated ducting to take it further- very cheap very effective!!!

Ive done some more work, turned up the fan and going to put it inside a box of mdf. I think I will hit 86-87 on the hottest days outside, hard to do anything about it when its 80f inside the apartment.

However with a little cooler weather Ive gotten down to 80-81f. I really think I have to settle for that and hope that putting plants, moist soil and such would help just a little bit to keep it at or under 80f. However the bigger fan and ducting mean I now have a "rooooar" sound coming from the air.

Im thinking of routing it to a box with sound dampening and perforate it with holes like a swiss cheese. Ive played around with putting sound dampening inside and the only think that helps is putting the wrist halfway into it.

Any other idea? I more or less have to direct it straight out and thats the problem.

SuperHI TnT said:

I’m a newb on heat stress...what are the indicators in that last picture

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If you have a close look at the leaves you will find that the tips but more importantly the sides are curling up. There are also some blisters on the leaf surface but you may not be able to see that in this picture. The top of the Buds are starting to foxtail (the white hairs). Near my forefinger you can see a banana. This could of be brought on by stress, could also genetic.

Lucky Luke said:

If you have a close look at the leaves you will find that the tips but more importantly the sides are curling up. There are also some blisters on the leaf surface but you may not be able to see that in this picture. The top of the Buds are starting to foxtail (the white hairs). Near my forefinger you can see a banana. This could of be brought on by stress, could also genetic.

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After I examined it more I could see the leaf edges curling and the foxtailing. I’ve had all three of those problems when the colas max out my height space

Lucky Luke said:

I grow in temps higher than that over summer. Is it ideal? Probably not. But it is certainly doable.

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This. I have some plants (including just rooted clones and a seedling) that were praying to the cob god when the temps hit 92f today, so as Lucky said, probably not ideal, but doable. As far as I am concerned, if they are praying, they are not adversely affected by those temps. Hell, a number of years back I was on a trail in Vietnam in over 105f temps with high humidity, when the breeze shifted, and the sweet smell of a MJ field wafted across my path, so temps in the high 80s or high 90s are definitely not a deal breaker, albeit not ideal.

Lucky Luke said:

A picture of the space and what your using would help.

This is my set up. Ignore the plants. Top down: Carbon filter, 6 inch ducting. Air cooled sealed hood, fans and down the bottom two passive intakes. Exhaust fan is outside the tent.

View attachment 4163679
In summer I can see 40s C in the tent (104F's) as I grow in an uninsulated tent.
This bud was grown last summer and saw 32-33c (89F). ( I think its the middle plant in the above pic btw)
View attachment 4163682

You can clearly see the heat stress. But its certainly doable.

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The ducting sucks. It's corrugated, or might as well be, with radical bends. Turbulence and inefficiency.

Are you running the air through the hood and a filter? If so - why?

hotrodharley said:

The ducting sucks. It's corrugated, or might as well be, with radical bends. Turbulence and inefficiency.

Are you running the air through the hood and a filter? If so - why?

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Im not sure I get what your asking. I haven't seen non corrugated ducting, Its that way due to the spiral wire frame that lets it bend without kinking. Not saying it doesn't exist, its just I haven't seen it.
In regard to inefficient..its a 6 inch silenced Hyper fan that I run at about 25-30%. http://www.hyper-fans.com/shop/product/hyper-fan-stealth?brandId=hyper-fan&categoryId=ventilation

Yes, its a common practice to drag the air thru the carbon filter to eliminate smell and then through the air cooled hood and then outside the grow area.

Lucky Luke said:

Im not sure I get what your asking. I haven't seen non corrugated ducting, Its that way due to the spiral wire frame that lets it bend without kinking. Not saying it doesn't exist, its just I haven't seen it.
In regard to inefficient..its a 6 inch silenced Hyper fan that I run at about 25-30%. http://www.hyper-fans.com/shop/product/hyper-fan-stealth?brandId=hyper-fan&categoryId=ventilation

Yes, its a common practice to drag the air thru the carbon filter to eliminate smell and then through the air cooled hood and then outside the grow area.

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All impedances to good air flow and air exchange . The straightest path at least. In trying to cool your grow.

Actually if you cant keep heat down, you should have RH up, except probably the bitter end... high heat low rh is more stressful to a plant tnan high temp high rh...

hotrodharley said:

All impedances to good air flow and air exchange . The straightest path at least. In trying to cool your grow.

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That's fantastic except I live in the real world. Carbon filter is a must as is a cooled hood that I can move up and down.