Venting hoods

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cbuts05

Well-Known Member
Ok so this has probably been asked a million times, but I'm having issue with heat , I'm week 3 into flowering and I don't get below 84F.

Setup is 2 1KS in cold cellar

8-6" reduced for the hoods with speed control still cranked

Filter . Fan . Ducting hood, ducting hood and outside.

Is this the best way to do it ?I also have two passive intakes coming from my basement in door and in concrete wall

Thanks
 
ZaraBeth420

ZaraBeth420

Well-Known Member
cbuts05 said:
They are about 5.5 X 6.5
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I think two 1K HPS bulbs may be pushing the limits of that space. I have a 600-watt HPS in a space about half that size (half the square footage), and it produces good yields.

You definitely need at least passive intakes; maybe active (i.e. fan-driven) intakes. Try passive intakes first, and if you can't maintain 78 degrees or below, add fans to the intake to help out.

Draw your intake air from your house or crawl space if you can. Spider mites do not live in crawl spaces. Do not draw your intake air directly from the outside unless you're prepared to battle spider mites.

Good luck.
 
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cbuts05

Well-Known Member
ZaraBeth420 said:
I think two 1K HPS bulbs may be pushing the limits of that space. I have a 600-watt HPS in a space about half that size (half the square footage), and it produces good yields.

You definitely need at least passive intakes; maybe active (i.e. fan-driven) intakes. Try passive intakes first, and if you can't maintain 78 degrees or below, add fans to the intake to help out.

Draw your intake air from your house or crawl space if you can. Spider mites do not live in crawl spaces. Do not draw your intake air directly from the outside unless you're prepared to battle spider mites.

Good luck.
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I have two passive intakes although they are covered with green furnace filter and nylon for light proof.
Here is a video aswell
 

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ZaraBeth420

ZaraBeth420

Well-Known Member
cbuts05 said:
I have two passive intakes although they are covered with green furnace filter and nylon for light proof.
Here is a video aswell
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Nice video. I have a couple suggestions:

1. Turn that oscillating fan down one notch to reduce the air disturbance of your plants. Some is good, a bunch is not as good (just my opinion). Too much air disturbance can cause them to expire water too quickly, especially in low humidity conditions.

2. The total area of your passive intake vents should be at least twice as large as the area of your exhaust vents; maybe more if you're exhausting air really "fast". And more if you're covering intake vents with a light blocker (as you are). You really can't have too much intake vent area. And remember to draw your intake air at the bottom of your tent, and exhaust from the very top.
 
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cbuts05

Well-Known Member
ZaraBeth420 said:
Nice video. I have a couple suggestions:

1. Turn that oscillating fan down one notch to reduce the air disturbance of your plants. Some is good, a bunch is not as good (just my opinion). Too much air disturbance can cause them to expire water too quickly, especially in low humidity conditions.

2. The total area of your passive intake vents should be at least twice as large as the area of your exhaust vents; maybe more if you're exhausting air really "fast". And more if you're covering intake vents with a light blocker (as you are). You really can't have too much intake vent area. And remember to draw your intake air at the bottom of your tent, and exhaust from the very top.
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Thanks, I'll turn them down when I get home, I just figured it was helping with heat and moving air around top of plants.

The passive intakes are fairly big,.one being 8X8 and one being like 12X9.

The fan is 8" reduced to 6 at pretty well full blast , 600 cfm
 
ZaraBeth420

ZaraBeth420

Well-Known Member
A lot of people vent their air-cooled hoods with a dedicated fan, and vent their grow tent with another fan. I use one fan for both, but I have a dialed-in space I've been working with for years. And I have a portable air conditioner in the bedroom that houses my grow closet.
 
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cbuts05

Well-Known Member
I once tried putting a spare fan ,(now used in veg room)
Attached to one passive hole with no ducting or anything but it didn't seem to do that much
 
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cbuts05

Well-Known Member
ZaraBeth420 said:
A lot of people vent their air-cooled hoods with a dedicated fan, and vent their grow tent with another fan. I use one fan for both, but I have a dialed-in space I've been working with for years. And I have a portable air conditioner in the bedroom that houses my grow closet.
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Yeah that's what I've been doing, using one fan for both..trying to save on hydro,I think when summer comes I'll have some issues though
 
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