Help with possible cooling issues on 8’ x 8’ room with 4x 1000 watt hps lights

Pauly1118

Pauly1118

Well-Known Member
So, a lot of people said I would have heat issues a while back and honestly I don’t think I will with my current set up but.. if them people are correct then, let me know about my idea and if you think it would be a good idea and work to keep my room idea temps.

8’ x 8’ x 8x’ room
4x 1000 watt HPS 8” air cooled lights

2x 16” oscillating fans

12” 1500 CFM inline fan outside of room connected to a Y duct that’s ran through the floor joists above the ceiling (drywall) (room is in basement) to the lights which is connected to 2 vents outside of the grow room ( to pull outside room air through lights)

8” ac infinity inline fan connected to 8” ac infinity carbon filter inside of room which is vented outside through a window for odor

8” ac infinity inline fan connected to 8” ac infinity carbon filter which is mounted on the wall outside of the grow room which vents into the grow room blowing fresh air into grow room

To me that seems like it shall keep the room somewhat idea temp but if not and it indeed reaches 90-100 degrees outside then here’s my plan without having to spend $2000-3000 on a mini split. Since the grow room is in the basement, and I have a spare bedroom upstairs that’s never in use. I plan on hooking 6” flexible ducting to my ac unit duct and run it above the drywall ceiling through the flooring joists and connected to an adjustable vent cover (centered in the middle of ceiling) adjustable so I can obviously have more control of how much cool air is being pushed into the room..

ALSO, I have another unused ac duct that’s literally right where my 2 vents are which are used to bring air into the air cooled hoods. I could run a Y duct onto that duct pipe and run flexible ducting straight into the 2 vents which would blow cold ac air though the lights

I know this is a lot to read but bare with me. Posting these pictures to kinda help you understand what I’m speaking of... do you think this would work just fine without having some expensive mini split ?

Don’t mind my ceiling. I just installed it last night and taped and mudded it. Still gotta tape and mud the ceiling corners and then slap panda film up there and then hang my lights.
 

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Southernontariogrower

Southernontariogrower

Well-Known Member
Think youll be ok, air cooled lights shouldnt get that hot. But 4 in 8x8 is alot of heat, fire her up and let me know, lve always had heat issues with hps but never did a setup like yours, 1 light grower for years. In 4x4 so l had heat issues. Always even with cooltube. Interested to see how it goes. Dont forget to update please. Thanks!
 
Pauly1118

Pauly1118

Well-Known Member
Southernontariogrower said:
Think youll be ok, air cooled lights shouldnt get that hot. But 4 in 8x8 is alot of heat, fire her up and let me know, lve always had heat issues with hps but never did a setup like yours, 1 light grower for years. In 4x4 so l had heat issues. Always even with cooltube. Interested to see how it goes. Dont forget to update please. Thanks!
Click to expand...

Thanks bro. Not to mention I have the furnace in the other room about 10 feet away and the wall behind this room has a vent blowing literally right on the room. Which is kinda of perfect, the cool air blasts right onto the ballast and right up into the pictured vents on the grow room wall
 
Southernontariogrower

Southernontariogrower

Well-Known Member
Pauly1118 said:
Thanks bro. Not to mention I have the furnace in the other room about 10 feet away and the wall behind this room has a vent blowing literally right on the room. Which is kinda of perfect, the cool air blasts right onto the ballast and right up into the pictured vents on the grow room wall
Click to expand...
Most that use air cooled hoods run a sealed room and co2, but co2 is heavier than o2 so basement is best for no co2, keep that fresh air pumping in and co2 will replenish itself, they really love any extra co2 you can give them, but fresh air works well too. They deplete co2 fast when lights on. Just saying bc of the high light value needs higher feed and co2. They all work as team. Best of luck with grow, l think you will do well.
 
jondamon

jondamon

Well-Known Member
Another thought as a possibility

Rather than having all 4 lights on one 12” fan you could run 2x8” fans one for each bank of 2x1000w lights.

this keep your runs in a straight line without a connecting Y but you would need 2 exhaust points on the outside.

if your 4 lights were all in a row

light - light - light - light - 12”fan
This would work better

light - light - 12” fan
Light - light -

This is going to mean you need some bends or joints to connect the lighting rig together.

where as if you have

light - light - 8” fan
light - light - 8” fan

this could work at keeping everything more stable.

make sure your intake for each lighting rig is outside of the grow area for pulling its clean air over the lights.

this way stops any recirculating of grow room air accidentally from inside the grow passing over unfiltered lights.
 
Pauly1118

Pauly1118

Well-Known Member
jondamon said:
Another thought as a possibility

Rather than having all 4 lights on one 12” fan you could run 2x8” fans one for each bank of 2x1000w lights.

this keep your runs in a straight line without a connecting Y but you would need 2 exhaust points on the outside.

if your 4 lights were all in a row

light - light - light - light - 12”fan
This would work better

light - light - 12” fan
Light - light -

This is going to mean you need some bends or joints to connect the lighting rig together.

where as if you have

light - light - 8” fan
light - light - 8” fan

this could work at keeping everything more stable.

make sure your intake for each lighting rig is outside of the grow area for pulling its clean air over the lights.

this way stops any recirculating of grow room air accidentally from inside the grow passing over unfiltered lights.
Click to expand...
Good advice. Because I was thinking earlier I should buy 2x 8” Ac Infinity can fans. They have about 450 CFM. I planned on putting them like...

Vent—Light—8”fan—Light- y duct-12”fan
Vent—Light—8”fan—light— y duct—^

Plus these 8” can fans are pretty cheap $70 to add 450 cfm on each light series bank
 

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Last edited:
jondamon

jondamon

Well-Known Member
Pauly1118 said:
Good advice. Because I was thinking earlier I should buy 2x 8” Ac Infinity can fans. They have about 450 CFM. I planned on putting them like...

Vent—Light—8”fan—Light— y duct —12” fan
Vent—Light—8”fan—light— y duct— 12” fan
Click to expand...
I would do

Vent - light - light - 8” fan - out
Vent - light - light - 8” fan - out

I’m talking about removing the need for the 12”.

what would be the need in your 12” at the end of your line?
 
Pauly1118

Pauly1118

Well-Known Member
jondamon said:
I would do

Vent - light - light - 8” fan - out
Vent - light - light - 8” fan - out

I’m talking about removing the need for the 12”.

what would be the need in your 12” at the end of your line?
Click to expand...
Check my pictures. I have it set up this way you’re explaining it now lol. Except the Y duct is inserted into the ceiling and runs through the upstairs flooring joists to outside of the room. And then it’s hooked to the 12” inline fan.. and then I have the 12 inch tapped into an upstairs bedroom vent( spare bedroom I don’t ever use)

Only reason I have the 12” inline is because that’s what I purchased and I figured the higher the cfm the better because I kinda figured it’d need some power to suck air thought my vents all the way throughout all the ducting
 
Pauly1118

Pauly1118

Well-Known Member
Jjgrow420 said:
If you are creating negative pressure in your basement watch your venting for hot water tank/furnace. If you have negative pressure your venting may not work.proper.and you will get blowback from the exhaust.
Click to expand...
explain this a little more ? Don’t think I understand completely lol sorry

My hot water tank/furnace is in its own closed off room. One of the vents is blowing cold air right into the grow room wall with my ac on
 
Jjgrow420

Jjgrow420

Well-Known Member
Pauly1118 said:
explain this a little more ? Don’t think I understand completely lol sorry

My hot water tank/furnace is in its own closed off room. One of the vents is blowing cold air right into the grow room wall with my ac on
Click to expand...
Google blowback from hotwater tank.
You're creating negative pressure and the air has to come from somewhere. Air doesn't care if a door is closed. Venting out that much air may cause the venting for gas units to not work as it should and blowback into the house unless you are replacing the same or more cfm into the 'lung room'
I have a passive vent (through chimney). In the winter the warm house causes convection through the chimney and pulls all the exhaust from boiler and water heater up and out the top. In the summer the temps are diff. Hot outside and cooler inside. The vent will work if there are no fans pulling air out of the basement but the moment you vent out the water heater vent actually starts to pull air from the top down and out and into the basement. Now your water heater turns on and all that exhaust is spilling out into the room instead of venting out like its supposed telltale sign of blowback is hot water tank is hot on top/plastic stoppers are melted or warped. Also rust on the bottom of the venting or ring of the tanks vent itself.
 
Pauly1118

Pauly1118

Well-Known Member
Jjgrow420 said:
Google blowback from hotwater tank.
You're creating negative pressure and the air has to come from somewhere. Air doesn't care if a door is closed. Venting out that much air may cause the venting for gas units to not work as it should and blowback into the house unless you are replacing the same or more cfm into the 'lung room'
I have a passive vent (through chimney). In the winter the warm house causes convection through the chimney and pulls all the exhaust from boiler and water heater up and out the top. In the summer the temps are diff. Hot outside and cooler inside. The vent will work if there are no fans pulling air out of the basement but the moment you vent out the water heater vent actually starts to pull air from the top down and out and into the basement. Now your water heater turns on and all that exhaust is spilling out into the room instead of venting out like its supposed telltale sign of blowback is hot water tank is hot on top/plastic stoppers are melted or warped. Also rust on the bottom of the venting or ring of the tanks vent itself.
Click to expand...
Ok I’ll read up on it now, what do you recommend I do just incase there is a problem ?

Also I heard it’s bad to exhaust odors out the chimney ?? What do you mean a passive vent through chimney ?? How is that possible ?? Or is it a unused chimney? Lol. I wish I had an unused chimney, I’d be blowing my doors all the way to outer space hahah
 
Jjgrow420

Jjgrow420

Well-Known Member
Pauly1118 said:
Ok I’ll read up on it now, what do you recommend I do just incase there is a problem ?

Also I heard it’s bad to exhaust odors out the chimney ?? What do you mean a passive vent through chimney ?? How is that possible ?? Or is it a unused chimney? Lol. I wish I had an unused chimney, I’d be blowing my doors all the way to outer space hahah
Click to expand...
The vent for hot water tank/furnace vented through chimney. No motors. Passive
 
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