Exhaust Fan Question

Killer Sativa

Killer Sativa

Well-Known Member
Hi Everyone,

I have been lurking this forum for weeks learning and adjusting my setup, excellent information here.

Here is my question...I am at the point I will need to add an exhaust fan to maintain a lower temperature and draw in fresh air. I would like to add some sort of smell control as well. I am having a hard time figuring out or deciding a few things and thought I may get some superb advice here.

Here are a few things about my setup:
  • Room size: 2'x4.5'x6'
  • light: 400w HPS
  • plants: 6

What I need help with, please keep on mind it's going to be hard to convince the wife to spend anymore money so I am on a limited budget.

  • What type of fan will be quiet and economical?
  • How do you figure the correct CFM fan to purchase?
  • Same with the inlet an outlet diameter?
  • What size filter
  • What type of filter when on a budget. (however I did read the post how to make your own and I will most likely do that)

Thank you in advance!
 
Autopsy

Autopsy

Active Member
a 4 inch inline exhaust fan and the cheapest carbon filter you can find on amazon (not sure if you're growing in a tent or closet) Assuming you're in a closet you'll need a hole of some sort to bring in fresh air and the inline to circulate everything, attach your inline to the carbon filter.
 
Autopsy

Autopsy

Active Member
Plus i'm about half shit faced so I might have read your question wrong, i guess the size of your inline fan depends on how hot it gets where you live...
 
tnelsonfla

tnelsonfla

Active Member
As far as fans you can go to Home Depot and get a rotating fan for under $9.00, if you go to eBay you can get computer fans with 23cfm's for a dollar a piece with free shipping( assuming you can wire them to a ac/dc adapter). A exhaust fan like .. a bathroom exhaust fan is around $15.00, does take some wiring and some mild construction work. You go to Target a get a three speed rotating fan/deodorizer/ionizer for around $70.00. All could/would work, do you have other lights planned? Is the HPS for your flowering light? Are you adding supplemental lights like T5 HO or CFL's ? That seems like a good size room for most varieties. I use a 26X46X72 room for 5 plants, but have over 1000 watts(CFL/MH/HPS/T5) and a temperature range of 73@ nite and 80 for day, with a humidity of around 40.
 
Killer Sativa

Killer Sativa

Well-Known Member
tnelsonfla said:
As far as fans you can go to Home Depot and get a rotating fan for under $9.00, if you go to eBay you can get computer fans with 23cfm's for a dollar a piece with free shipping( assuming you can wire them to a ac/dc adapter). A exhaust fan like .. a bathroom exhaust fan is around $15.00, does take some wiring and some mild construction work. You go to Target a get a three speed rotating fan/deodorizer/ionizer for around $70.00. All could/would work, do you have other lights planned? Is the HPS for your flowering light? Are you adding supplemental lights like T5 HO or CFL's ? That seems like a good size room for most varieties. I use a 26X46X72 room for 5 plants, but have over 1000 watts(CFL/MH/HPS/T5) and a temperature range of 73@ nite and 80 for day, with a humidity of around 40.
Click to expand...
Yes this HPS is for flowering and no I will not be acquiring another light for flowering.
Temperature hits around 93 during the day if I keep my grow closet closed...yes it will get hotter. Humidity is below 50% all the time.
Currently I have one 10" tornado style fan cooling the light in a homemade manner and i have (2) 6" fans circulating the air around the plants. I also have a 4" vent that I already made for an exhaust and one for intake. Just need to figure out the proper CFM's to cool this room.
CO2 is not an option because of budget, I also wanted to control the smell as well. So I figured filter + fan would be my best option to accommodation the smell and the temperature.
 
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