Cooling Closet Without A.C hood?2*400HPS?

[SumDumGuy]

Thanks very much!! 2 last questions..since I didnt wanna start a new thread ...

1.Can I split the ducting two ways...have one fan,pulling through a hood or TWO...AND exhauting the hot air out using a yduct spliter?

Basically SPLIT the 6 in to two.....one ducting strictly for my hoods,and the other duct to exhausdt hot air.?

Will this sill create negative pressure?

You have a 6in centrifugal fan which should be 465cfm. Yes, just duct one end of the hood and leave the other side open so it removes heat and replaces the air in the room. Just leave the louver low on the door so the air that comes in is the cooler air from the ground. Make sure the glass is ON the hood so it uses the full air path over the bulb.

Do not use a 6in inline duct fan. Those don't have the power of a centrifugal fan.

 

[dustin27]

Did you say take the glass off the hood, and also leave one hood vent open, with the other ducted and attached to a pulling fan, correct?

I have a similar set up in a closet, VERY GHETTO construction, for experiment purposes. 1000w bat wing hood. I have a huge hole in the wall by the floor, so i stuck a huge box fan there to pull air in, then i wrapped the "grow area" in plastic and sealed it, then stuck a smaller box fan up top by the light and have that pulling air out. Mind you, all these fans are regular fans no extraction fans. By reconstructing the "area", sealing it off, and implying basic theory of ventilation(VERY BASIC, ghetto intake/outttake) the temps are down 10 degrees. Its not a perfect solution, just an experiment I set up to test.

 

[SumDumGuy]

Did you say take the glass off the hood, and also leave one hood vent open, with the other ducted and attached to a pulling fan, correct?

I have a similar set up in a closet, VERY GHETTO construction, for experiment purposes. 1000w bat wing hood. I have a huge hole in the wall by the floor, so i stuck a huge box fan there to pull air in, then i wrapped the "grow area" in plastic and sealed it, then stuck a smaller box fan up top by the light and have that pulling air out. Mind you, all these fans are regular fans no extraction fans. By reconstructing the "area", sealing it off, and implying basic theory of ventilation(VERY BASIC, ghetto intake/outttake) the temps are down 10 degrees. Its not a perfect solution, just an experiment I set up to test.

Sorry I just made that edit: ON ON ON lol. Leave glass ON!!! Yes you want that air pressure rushing over and under that bulb. The idea is to create a fast air current. Speed removes heat. The faster the airflow the better heat removal.

I don't believe there is any such thing as ghetto. There are those with means and those with ideas. Idea makers create standards and invent new ways for us to grow. That to me isn't ghetto but evolution of our hobby.

Though as FreezerBoy mentioned.. Where in the wall is that air coming in from. Just a regular wall space? May not be safe. Has this system been in place for a while? Have you grown from it? Whats the longest you left it on without feeling like you were safe?

 

[bushwakka]

my first ever grow i grew in a closet but was lucky enough for the lofthastch to be in roof, i just made a hole in the door to hold a pc fan and that blew in and out through the hatch,was a fantastic grow that i put down to all the fresh air.

 

[SumDumGuy]

Absolutely We primarily observe a plants eating habits at the root level. Its just as important to focus above the the root zone. Stagnant air will be depleted of all its benefits very quickly if your plants are large so you need that air flow for replenishment. This is why I always strip the bottom third if not more of all my plants. Good job BushWakka.

 

[blueberry dank]

Ok guys thanks ALOT..I have couple last questions...

I will have a single 435 CMF centrifugal fan....connected to a y-splitter...One side will have ducting through my a.c hood,..the other hole will not be covered..it will be open...

1.Will this create tyhe nessesary negative pressure,even though Im basically splitting the cfms?Does it work like that? So a 6in fan split into two..one for the lgiht reflectors,one for the exhaust..

2.If I was to have a carbon filter..which end should I connect it to..the a.c hood vent..or the open exhaust hole?

Sorry if Im annoyin ya guys...

 

[dustin27]

Sorry I just made that edit: ON ON ON lol. Leave glass ON!!! Yes you want that air pressure rushing over and under that bulb. The idea is to create a fast air current. Speed removes heat. The faster the airflow the better heat removal.

I don't believe there is any such thing as ghetto. There are those with means and those with ideas. Idea makers create standards and invent new ways for us to grow. That to me isn't ghetto but evolution of our hobby.

Though as FreezerBoy mentioned.. Where in the wall is that air coming in from. Just a regular wall space? May not be safe. Has this system been in place for a while? Have you grown from it? Whats the longest you left it on without feeling like you were safe?

Inside of this hole theres pipes and crap, its an older building. I'm also on the top floor so the roof is directly over me. But, from what I understand FreezerBoy said dont vent INTO walls, I'm pulling air out, but it may not make a difference. In fact if by not feeling safe you mean negative pressure collapsing walls, then I understand. On that note, the box fan is just sitting up against the hole, its not air tight against the wall.

Its only been a temporary solution. Ill be picking up my new hood tomorrow. But im not sure what I'm going to do as far as ventilation. Maybe rig a tent.

Whats the difference between inline fans and those larger centrifugal fans, where they are placed and how they are mounted...


EDIT : sorry i cannot help you bbdank, but your thread is helping me learn alot just as you are. thank you

 

[SumDumGuy]

Ok guys thanks ALOT..I have couple last questions...

I will have a single 435 CMF centrifugal fan....connected to a y-splitter...One side will have ducting through my a.c hood,..the other hole will not be covered..it will be open...

1.Will this create tyhe nessesary negative pressure,even though Im basically splitting the cfms?Does it work like that? So a 6in fan split into two..one for the lgiht reflectors,one for the exhaust..

2.If I was to have a carbon filter..which end should I connect it to..the a.c hood vent..or the open exhaust hole?

Sorry if Im annoyin ya guys...

I was just thinking to lose the "y" and dedicate the whole 435cfm to heat extraction. But that 435 is quite alot so the offset would also be clearing the room fast while letting the louvers take care of intake. Try and get steel louvers since metal will cool as air hits it at a high rate cause a 2nd ac effect.

You're not annoying me or anyone else bro. Just remember you have stepped into a site where other people grow and have tried what you are doing. You are welcome to ask all the questions you want because this is what the site was designed for right? I'd also add that fan opposite the intake for the hood. It'll maximize the fans wind direction.

 

[SumDumGuy]

Inside of this hole theres pipes and crap, its an older building. I'm also on the top floor so the roof is directly over me. But, from what I understand FreezerBoy said dont vent INTO walls, I'm pulling air out, but it may not make a difference. In fact if by not feeling safe you mean negative pressure collapsing walls, then I understand. On that note, the box fan is just sitting up against the hole, its not air tight against the wall.

Its only been a temporary solution. Ill be picking up my new hood tomorrow. But im not sure what I'm going to do as far as ventilation. Maybe rig a tent.

Whats the difference between inline fans and those larger centrifugal fans, where they are placed and how they are mounted...


EDIT : sorry i cannot help you bbdank, but your thread is helping me learn alot just as you are. thank you

Nice you're going to love your hood! As for ventilation I know some might say this is overkill but keep is 1Cfm to every 2W. So for a 1000Watter look into 465CFM. For a 400Watter look into 265CFM. Being that Dank is at 400W with 425 I think he will be in the clear with 1CFM to 1W.

I have to admit though I love the tents. Plain and simple they are designed to produce fire when fitted like a mini tank with all the bells and whistles. And they'll also produce fire with a simple light and fan only. It's up to the grower..

Inline fans assist in airflow. A 6in inline will produce about 265cfm. A 6" centrifugal produces twice that. Centrifugals look beefy while inlines of the same diameter are smaller and designed to fit and hide streamlined into long distance ducting.

 

[dustin27]

Thanks for the info. THAT WAS SO HELPFUL and i didnt have to make a new thread. I have another few questions for you, if its okay with the OP, but I think they pertain to the thread. I cant decide whether to continue in my closet, and vent possibly straight up through the ceiling, or to build a tent out of pvp pipes and plastic.

1. from what I've read, it goes hood>>air ducting>>centri fan>>scrubber(if possible)>>hole in ceiling/wall>>air goes into new area.

If that being the most useful way to use the centri fan, does it rig easily to ceilings/walls? It seems like it'd be a pain to put it on my ceiling. Or on a floppy walled tent.

I swear I read somewhere about pulling hot air from the hood damages the fan blades? perhaps only plastic inline fans they were talking about...

But im glad i found someone who knows about ventilation to help me, thank you.

 

[dustin27]

Also, I just got rough, rough dimensions on my current "growing area" part of my closet.
3.5ftwide x 2.75ftdeep x 5.3ft tall.

If you could lean towards tips on venting the tent, id love that. I think Ill just make a 5x7 tent and take up some bedroom space. Hope the lady dont mind it too much, but she'll have her closet back.

the 5x7 space will be better use of my 1000w too i think? and more air space, less work to cool..?

 

[blueberry dank]

First....dustin i feel you shouldnt worry about pulling hot air through a good quality fan..theyll be fine...create negative pressure to keep fresh air entering your intake.. and keep smells in...have the air pulling THROUGH the filter and hoods..and out the room..fans are most efficient when pulling air..a 1000hps gets hot..so work on your ventilation!!have an oscillating fan gently blowing upwards and moving air around too....

hope i helped some...

 

[blueberry dank]

now..heres to my question to dumguy and whoever else might wanna help... I have to choises...heres one

OR should I skip the y splitter,and just have my exhaust at the end of the a.c hood?will this be enough to exhaust my clsoet...

which plan to go with?also dumguy i was trying to make mine passive intake..so would my plan work using passive darkroom louvres?

this might make a good ventilation thread for noobies lyk me?lol

 

[dustin27]

i only see/read the one plan :/

you were very helpful, thank you

 

[blueberry dank]

you cant see my drawing??

 

[dustin27]

no drawing

 

[blueberry dank]

what about now?i had it in prrivate..lemme kno dustin

 

[dustin27]

YES! i can see it

 

[mtbazz]

I ran a 430 watt in a closet (5'long, 2.5 ' wide, 8' high) without cooling the hood.

I wouldnt do it again.

If your going to do this, do it right and safe. Sell your light and get an air cooled hood and connect an exhaust fan to it.

Any others with experience to cooling a closet without a.c hoods?..please please please!!!aaaah!!

And yeah Ill have the A.C as cold as possible in the room...with the door cracked for intake...and exhausting the air near the top of the closet with a 6in centrifugal fan....Valueline.

 

[Guest 88950]

i use a 400w in an aircooled hood and i put a cheap 4" fan in the intake opening and it blows all the hot air out of the hood and into the attic. i also have a 300w equivalent CFL for lower level lighting.

dont vent into walls b/c the moisture will cause mold to grow.

i keep my house at 77 F and my closet never gets over 85 F.

if you dont have a hood then think about hanging a bare bulb vertical and use a tomato cage to prevent the plants from touching the bulb. place a fan under the bulb and an exhaust above the light.

just some thought. to determine if the canopy is too hot just place you hand at canopy height for a min and if its not too hot for your hand then the plants will be ok.

the key to combating heat is increased ventilation with proper placement of intake and exhaust.