Heat issues

cogrowco

New Member
Hello everyone - first post here, though I've been reading these forums for a while. Usually I find answers, but this time I'm just not coming up with a solution.

I am struggling with heat in my bloom room - I've been running 600w lights, but made a change over to 1000w lights this cycle and I can't get the heat down, every day the temperatures are moving into the mid-high 80's which is waaaayyy too hot.

Originally, we had two 8" fans (1 fan per 2 lights) pulling through a carbon filter and exhausting outside. We also had a 6" fan exhausting from the ceiling to outside. (By outside, I mean outside the house, not just outside the room)

I just changed the setup for the lights, now the two 8" fans are setup after the lights and pull in from outside and exhaust to a different part of the outside. The 6" fan still vents through a filter to the outside. This seems to be helping, but its still too hot in the room, capping in the mid 80's.

The weather here is not especially hot, currently, outside highs are getting up to about 70, and over the summer we'll hit 90 occasionally, but mostly its fairly temperate.

I've attached a rough sketch - I'd love some ideas. I am planning to add 6 more lights in the next room over, but I have to solve the heat issue before I take that step. Our veg room is in another room right next door, but it usually stays in the 70's even with minimal ventilation.

A few other details: The lights are 8" magnum xxxl, the ducting is all flexible 8", and all intake outtake connections are 8" as well.

Help! Thanks!
 

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How big of a surface area does your passive intake have?

Ideally you should have around 3x the spigot size of your exhaust fan.

90degree bends in ducting are bad as they restrict airflow.



J
 
How big of a surface area does your passive intake have?

Ideally you should have around 3x the spigot size of your exhaust fan.

90degree bends in ducting are bad as they restrict airflow.



J

Yes, I've got 2 bends in each pipe, not much I can do about that, I made it as straight as possible and made the bends long to minimize that issue. The 3x intake is interesting, I think it is probably about that, each intake hole is at least 6" diameter, and, now that I think about it, I actually have 3 since I left an old exhaust port open.

Does anyone run an intake fan as well as an exhaust for room ventilation (not lights)?
 
Many people do as it gives greater control of temps and optimum airflow.

Usually an intake fan is around 10% less in CFM or m3/h than the exhaust fan.

If its too small both fans will work harder.



J
 
Also is one of your intakes coming from the veg area?

What's the air temp coming in from that area?


J
 
Return to the 600w HPS lights. obviously the heat from the 600w is too great for the system or area you have developed, although you have offered your plants more light you also have offered too much heat, with very little improvement in yield and yield is what its all about, then ....quantity !
 
We have about a week left on this harvest, if the yield isn't substantially higher we will definitely drop back to the 600w. If it is, we will add ac.
 
We have about a week left on this harvest, if the yield isn't substantially higher we will definitely drop back to the 600w. If it is, we will add ac.
Heat stress can cause lower yields, and hermies.
You should get the temps under control before comparing yields.
 
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