what's wrong with my setup, it won't reduce temps!!

[Guest]

how can I reduce temps?

 

[cough_cough_eer]

to me , it looks like it should work .But someone else could probably give you a better answer, But they probably need more info , like what size is your cab? how many watts > hps??? MH?? what size fan.

 

[cough_cough_eer]

Doh'

Doh'

you might check to see if your temp reader is accurate, I have these two that rellikbuzz brought over and had them side by side for about a week now and the two never read the same. You could use small nails for your weather stripping, assuming your box is made of wood.

 

[Guest]

I would get rid of the 90 degree bend in the ductwork coming off the CAN carbon scrubber. This will alleviate some static back pressure and provide better a flow with your in-line fan.

Always try to minimize unnecessary duct bends (if at all possible) to reduce the resistance loads on your in-line fan.

 

[Guest]

Try placing the carbon scrubber in a vertical position directly over the in-line fan.

Then secure the carbon scrubber to the shelving for bracing with a zip tie or bailing wire or rope.

Then use aluminum tape to secure the scrubber to the in-line fan.

If you have the room, this is what I would do.....

 

[Guest]

Try moving the ballast out of the grow room if you have enough cord as the ballast gives off a shit load of heat ............ this will help also ......

 

[igotpron]

hmm. i dunno if you got glass on your hood but that might help.. and if your cab is set up on a raised floor. try cutting a hole in the floor and hooking your darkroom vent up to suck up air from under the house, that air is usually a lot colder then ambient temps.. other then that i unno yo, maybe seal up light entirely and vent fresh air (outside air) through the hood and out your exhaust... but thatd make scruber useless unleass you got another fan and kept it in cab.. i unno im just a jackass who babbles way to much..

 

[Jnugg]

The problem more than likely lies in the fact that you are using a 4" 172cfm exhuast fan to both exhuast your grow and cool your 250 HPS.Go with a 6" 265cfm or 440cfm inline and I guarantee you won't have heat issues.

 

[1stCropLongGone]

Just a thought: maby to close your cab you could use latches like the ones on toolboxes.
They are clasping latches to pull it tight and would be easier then screws.
IMO your temps are not that bad, keep tinkering.

 

[Guest]

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I would add another intake grill such as this one to the cabinet. More fresh air .... hopefully the ambient air around the cabinet is cool enough and not a sauna ?

 

[dan kay]

^^^ i was thinking along the same lines. what's your ratio of intake vs exhaust size? you have 4" exhaust from that fan, and that looks like maybe a 4" intake? Plus those louves affect airflow.

 

[dan kay]

you probably really are going to need to cool the closet if your ambient temps are upper 70s. You need to be sucking in air that is cooler than your target. the fan you have should be enough for a 250 watt bulb. I'd look at getting your ambient temps down. plus when you go to a 6" fan you're going to have to put in more passive intakes for sure.

 

[bostrom155]

If your room is in the high 70's u will not get low 80's in the cab, cool the room to 73-75 the fan should work, what size is your intake?

 

[Jnugg]

You can but all the fans you want and you still won't cool your cab.

In order to cool the cab you MUST have cool air coming in,so if air outside of cab is warm (above 73-75F) you won't be cooling.

 

[br26]

to make cool air, just cool that room only. try by closing the vents for the incoming hot air and keep open the ducts for the cool air. Close the door and if the room has a window and it's cool enought outside, the room should lower in temp anywhere from 10-20 deg F.
the incoming air to the box will be much cooler.

good luck

 

[Guest]

The ambient air is the key ... I agree with what Jnuggs posted.

Getting a bigger in-line fan will not do jack unless the air you are pulling in is cooler .....

One quick test is to see if your in-line fan is dragging is to pull it off and put it on while it is running so you can "hear" if the inline fan is bogging down.

This means you need MORE air INTAKE or another intake vent.

Try to get the intake to where the in-line fan does not bog down with resistance because it is sucking too hard .... increasing temps. Place a fan adjacent an intake grill if needed.

 

[Jnugg]

Ok ABCDABCD.I will attempt to explain this in a manner you can understand ok...ok.

You have a bedroom.In the bedroom is a closet.In the closet is your grow cabinet.

Leave the fucking closet door open or make sure there is atleast a 2" gap between the bottom of the door and the floor.

Turn your air conditoiner on and set at 70 degrees F.

Place your light in the cabinet.Plave the fan outside of the cab and ontop of it.Cut a hole through the top of your cab and run some ducting from the light out of the cab and connect to the exhuast fan.Connect a length of ducting to the other side of the fan and run that either trhough the ceiling into the attic or out of the closet.

You must have a way for air to get into your grow cabinet so you must make intakes (I see you have one darkroom vent).If you do not cool the air in the room the closet that houses the grow cab is in then the grow cab wont get cool air meaning it will not cool the cab.

Warm air coming in equals even hotter temps in the cab.

With a 250 watt HPS and a 4" 170cfm inline you should set the A/C at 70-72F.leave closet door open so the cool air can get in there and be sucked into your grow cab by passive intake.

How many more posts of the sam shit are you going to make?

 

[notjonesinNEmor]

One thing you can try before you spend money a bigger fan. Try removing that louvered intake on the reflector. I'm not so sure that your fan is undersized as you may have a intake restriction. When your door is closed you have a 7 degree difference in ambient and inside temps. See what the temps are after removing the reflector grate. The next suggestion would be to add more intake area (another vent)

The drop in temps caused by opening the door lead me to believe that the problem is on the intake side somewhere.

Just my

 

[Jnugg]

It is on the intake behalf notjonesinNEmore.

He probably does not have a large enough gap betweein the closet door and the floor of his bedroom/closet.He could always take the door down and sand the bottom edge down so that there is atleast a 2" gap between the door and the floor.Also the fact that abcdabcd may just be dumping the hot air back into the closet he has his cab in.

 

[LEGI0N]

I'm not sure if it has an effect but the carbon scrubber should be in the closet and fan pulls from the carbon and blows out. That's why they have the dust sock on the outside. I don't think it should have too much of an effect right now. What is that carbon scrubber rated as? CFM wise... It should be bigger then the CFM of the fan.

I agree with the inlet. If the temps come down with an open door then you need to increase the vents. Maybe put a 'helper' fan on the inlet.