400 cfm fan/filter to cool 2 600w hps

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Mobileaudio25

Active Member

• Nov 5, 2014

• #1

Do you think a 6in 400cfm fan would be enough to 2 600w hps lights?

Phresh filter website recommended that I get a 398 cfm filter or higher based on my room size and having 2 lights. Tent is 287.5 cubic feet.. I have a 550 cfm phresh filter already I'm just wondering if I can get by with using a 400 cfm fan or if I should get a larger one

 

butsack

Well-Known Member

• Nov 5, 2014

• #2

yeah it should be just right, and its recommended to get 1 size too big on the phresh filter.

 

M

Mobileaudio25

Active Member

• Nov 5, 2014

• #3

butsack said:

yeah it should be just right, and its recommended to get 1 size too big on the phresh filter.

Click to expand...

I'm building a cabinet inside of a room. Would it be a good idea to cool the lights using the room air and exhausting into the attic. Then also run a separate duct to the attic for a carbon filter only. Just run 2 inline fans one cooling the lights and another filtering the smell?

I have all of the equipment to do either way. Would it be easier to manage heat and smell that way you think?

 

butsack

Well-Known Member

• Nov 5, 2014

• #4

maybe one cooling your sealed hoods, exhausting thru the filter and one bringing in fresh air..

 

M

Mobileaudio25

Active Member

• Nov 5, 2014

• #5

butsack said:

maybe one cooling your sealed hoods, exhausting thru the filter and one bringing in fresh air..

Click to expand...

By sealed hoods do you mean just sealed off from any air being sucked into the ducting and fan that is being used to cool the lights. I was thinking about an open duct in the cabinet running to a fan which will cool the 2 600w hps exhausted into the attic. Then a separate fan and filter in the room for smell/humidity which will be exhausted into the attic as well?

A 400cfm is enough for my room alone and another 400cfm on the lights should be plenty to cool them right ?
Thanks for the help

 

butsack

Well-Known Member

• Nov 5, 2014

• #6

yeah but if you exhaust air from your room over your lights to your attic with no filter... it defeats the purpose of using the filter at all right?

 

M

Mobileaudio25

Active Member

• Nov 5, 2014

• #7

butsack said:

yeah but if you exhaust air from your room over your lights to your attic with no filter... it defeats the purpose of using the filter at all right?

Click to expand...

I'm sorry maybe you misunderstood. I'm building a cabinet 11.5 x 5 x 5 for a sog style. This cabinet will be inside of a bedroom. The cabinet will be using a passive filter to suck air in the cabinet which will house the 2 600w lights and the carbon filter. The cabinet inside the room will be under negative pressure. Inside the cabinet a fan filter for smell/humidity. Then another hole in the cabinet with ducting running to a fan bllowing on the 2 600w hps going into the attic

 

butsack

Well-Known Member

• Nov 5, 2014

• #8

[filter]=[600w]=[600w]==fan==attic
or
fan[filter]=[600w]=[600w]==attic

 

DemonTrich

Well-Known Member

• Nov 6, 2014

• #9

I use 2x6" 440 cfm fans to cool my 2x600w hps big kahuna hoods. now I added a 3rd hood (smaller) but still 600w hps for 3x600hps. I do run a portable a/c. still keeping temps at a stable 75* in a 5x10x7 tent. I may add a 3rd 6" 440 fan if I can find a spot for it.

 

M

Mobileaudio25

Active Member

• Nov 6, 2014

• #10

DemonTrich said:

I use 2x6" 440 cfm fans to cool my 2x600w hps big kahuna hoods. now I added a 3rd hood (smaller) but still 600w hps for 3x600hps. I do run a portable a/c. still keeping temps at a stable 75* in a 5x10x7 tent. I may add a 3rd 6" 440 fan if I can find a spot for it.

Click to expand...

That's a blot more cfm than I thought I would need. Do you think the 400 Cfm will cool two of my 600w hps?

 

DemonTrich

Well-Known Member

• Nov 7, 2014

• #11

possibly. depending on your grow area ambient temp, and your extraction fan setup, youll probably run at 77*-81*. your gonna get a "hot pocket" under each hood on the plant canopy. that's why I have an oscillating fan in my tent blowing under my hoods (I removed the bases, made my own stand from concrete and a jug, then placed on 2x cinder blocks for added height). I still need to put my 2nd fan in the tent for more air movement.