Quick Vent Question

Hi everyone , need some input please ...

Right well i currently have a stealth cabinet setup. ive recently upgraded from a 250w HPS in a cool tube to a 400w HPS in a cool tube ... its set up in the following way .

Filter > Fan > Cool Tube > Ducting out cabinet

I also have a 5inch PC fan sucking air in and a 6inch fan blowing air around the room.

OK so question is now ive upgraded to the 400w my temps fluctuate between 27°C / 80°F and 32°C / 89°F during the lights on period.
I have got a spare bathroom fan exactly same as this one http://www.wickes.co.uk/invt/199796?wt.ac=sp030005

Should i fit it into my cab bringing more air in or should i use it to draw more air out ? i want to get the temps to drop to about 25°C / 77°F - 27°C / 80°F max ... any ideas that can help?

The reason im asking is because as the hotter summer days come the cabinet temp will get hotter and i dont want it getting to hot it kills my babies while im out or away for a weekend

Anyone got any input ? need to decide where to use the fan

you want the fan pulling air from the light, not pushing air onto it. switch the fan to exhaust, not intake.

toastycookies said:

you want the fan pulling air from the light, not pushing air onto it. switch the fan to exhaust, not intake.

Click to expand...

i heard this debate a million times , and imo from trial and error this doesnt affect the temps that much and theres no difference to how the fan is used , i use it this way so i get the max suction through my filter. thats not the issue the issue is the new fan .. should i fit it on the end of my ducting sucking more air through the light tube or in the cabinet bringing more air in ?

that fan you posted doesn't look like it will make much of a difference at all. how much air does it push? by the picture it looks about the size of a computer case fan so i am guessing around 30CFM?

what are the temps in the room the tent is in?

the room temps are standard room temps around 22 - 24 ish ... the fan is a standard Bathroom extraction fan its alot powerfuller (dont even think thats a word lol) that a PC fan.
It doesnt state the CFM on it just that is 250v/16w

I would reconfigure it so the cooltube has it's own intake/exhaust (no filter) with a seperate intake/exhaust (with filter) for the chamber. It's just easier on the math skills, lol.

i think that bathroom fan is the problem because ive got a 600 hps cool tube with 6" fan and my temps are perfect, plus i only have about 4 foot height, a bigger fan sucking the heat out of cooltube will def sort your temps out.

ROBSTERB said:

i think that bathroom fan is the problem because ive got a 600 hps cool tube with 6" fan and my temps are perfect, plus i only have about 4 foot height, a bigger fan sucking the heat out of cooltube will def sort your temps out.

Click to expand...

the bathroom fan isnt connected its an addition ive got ... the cooltube is connected to my main fan and filter

You're cooling your light with air that is being heated in the room. Pull light cooling air from somewhere cool outside the room.

Eviljay said:

You're cooling your light with air that is being heated in the room. Pull light cooling air from somewhere cool outside the room.

Click to expand...

If the fan is always on then this would not matter right?