What size fan??

David Ferguson

David Ferguson

Active Member
Building an indoor room with closed off plant room. Plant room itself is approx 8' x 5' (and 8',3" ceiling)...and I'll be growing just 4-6 plants max in this room.
A/C (8000 btu) blowing cool air IN, 1-2 oscillating fans, 2+ stationary fans, dehumidifier, etc. Insulation foam walls connected to wood frame.
Buying an AC INFINITY fan for exiting the plant grow "room", but unsure of what size fan...4" or 6"??
Please give me your thoughts and questions. Looking to buy soon. Thank you!
 
f series

f series

Well-Known Member
I prefer the 6 cuz it Maxes out at 40watts. If you can, maybe 2 6 inchers
8 inch Maxes at 200+watts I believe


6 inch infinity will blow thru filter, but very reduced flow. I had a 2 6 inchers. intake on half speed and exhaust on full with a filter.
Drew cool air from window into 4*4 tent, then I had 2 spots, top and bottom ducting to my 2*4, and exhaust plus filter through the top. If I find pics I'll post. I might have them in my journal not sure
 
GBAUTO

GBAUTO

Well-Known Member
That room is about the size of my grow space. A 4" fan won't be enough but the 6" should do fine.
 
NugHeuser

NugHeuser

Well-Known Member
I would go atleast 8"
6" is probably okay without a carbon filter, personally if I was using a CF I'd get a 10" and dial down the speed for low wattage with still alot of air movement. And I highly recommend hyper fans for inline fans, they are the most efficient out there. Wish I never wouldve wasted my money on amazon brand fans, energy hogs and less power.
 
Renfro

Renfro

Well-Known Member
The AC infinity won't fight static pressure well so if there is a carbon filter or long duct run involved you will need to upsize it to get the job done. A centrifugal blower will fight static losses way better at the cost of noise.

You have 330 cubic feet to vent, if doing this for cooling purposes it is generally recommended to have a 2 - 2.5x a minute turn over so thats 660 - 825 actual CFM. Of course ambient temps have a lot to do with this as does the lighting source. I hope this helps you out.
 
David Ferguson

David Ferguson

Active Member
Renfro said:
The AC infinity won't fight static pressure well so if there is a carbon filter or long duct run involved you will need to upsize it to get the job done. A centrifugal blower will fight static losses way better at the cost of noise.

You have 330 cubic feet to vent, if doing this for cooling purposes it is generally recommended to have a 2 - 2.5x a minute turn over so thats 660 - 825 actual CFM. Of course ambient temps have a lot to do with this as does the lighting source. I hope this helps you out.
Click to expand...
Thank you so much for this. So you say it has to do with ambient temperatures and Lighting. I will be using an hlg 550 LED and ambient Temps should be in the range of 73 to 78 degrees Fahrenheit. Fan not necessarily for cooling purposes so much as air flow. I was planning to use a filter however if you think that it is not necessary then let me know and I can 86 out of it altogether. One question though. If I were to not use ducting or filter then how do I keep light from coming in from outside? If you can please respond with your thoughts on this that would be awesome. Thank you so much!
 
Renfro

Renfro

Well-Known Member
David Ferguson said:
I was planning to use a filter however if you think that it is not necessary then let me know
Click to expand...
Well odor control is more important for some than others.

David Ferguson said:
If I were to not use ducting or filter then how do I keep light from coming in from outside?
Click to expand...
Good question, I am not sure how much light gets thru one of those. I know my centrifugal blowers don't let much light thru, if any. You may have to put an adjustable elbow on the outside and point it away from light sources. You can also paint the inside of the elbow with flat black spray paint.

Since you aren't using it for cooling you won't be as concerned with CFM losses. You will definitely want good ventilation if you end up with humidity issues when your plants are big. I always like to upsize a blower if it's in the budget then I can always slow it down with speed control. Plus if you change the grow around later you may actually need all the CFM.
 
S

SimpleBox

Well-Known Member
Renfro said:
The AC infinity won't fight static pressure well so if there is a carbon filter or long duct run involved you will need to upsize it to get the job done. A centrifugal blower will fight static losses way better at the cost of noise.

You have 330 cubic feet to vent, if doing this for cooling purposes it is generally recommended to have a 2 - 2.5x a minute turn over so thats 660 - 825 actual CFM. Of course ambient temps have a lot to do with this as does the lighting source. I hope this helps you out.
Click to expand...
What brand centrifugal blower do you use?
can you explain static pressure as best you can in regards to pulling air thru a carbon filter with an AC infinity/Can max fan type of fans.
Thx
 
BigDawg@1964

BigDawg@1964

Active Member
David Ferguson said:
Building an indoor room with closed off plant room. Plant room itself is approx 8' x 5' (and 8',3" ceiling)...and I'll be growing just 4-6 plants max in this room.
A/C (8000 btu) blowing cool air IN, 1-2 oscillating fans, 2+ stationary fans, dehumidifier, etc. Insulation foam walls connected to wood frame.
Buying an AC INFINITY fan for exiting the plant grow "room", but unsure of what size fan...4" or 6"??
Please give me your thoughts and questions. Looking to buy soon. Thank you!
Click to expand...
 
BigDawg@1964

BigDawg@1964

Active Member
My room I'm running 8000 btu window unit 8x12 room size with optic one led lights, which are great heat wise, running 6 in hydro active farm fan with 25 ft of duct and on days with 90 degree outside temps I run air on low and fan on medium and temps in grow room running 77 degrees so 6 in has worked great
 
JohnDee

JohnDee

Well-Known Member
Renfro said:
You have 330 cubic feet to vent, if doing this for cooling purposes it is generally recommended to have a 2 - 2.5x a minute turn over so thats 660 - 825 actual CFM. Of course ambient temps have a lot to do with this as does the lighting source. I hope this helps you out.
Click to expand...
Dave...what Renfro stated here was fairly common practice. But also...you need to look at your room...esp. heat and humidity. Is your exhaust partially controlling those things...and size accordingly.

From the plants perspective...the exhause fan blows out stale air and brings in fresh CO2. It's all about the CO2...

My room is slightly bigger and I use Panasonic Whisperline 240cfm...6". I suppose I get complete air exchange every 1 1/2 mintes. Something like that. Plants seem to like it.
JD
 
BigDawg@1964

BigDawg@1964

Active Member
David Ferguson said:
Building an indoor room with closed off plant room. Plant room itself is approx 8' x 5' (and 8',3" ceiling)...and I'll be growing just 4-6 plants max in this room.
A/C (8000 btu) blowing cool air IN, 1-2 oscillating fans, 2+ stationary fans, dehumidifier, etc. Insulation foam walls connected to wood frame.
Buying an AC INFINITY fan for exiting the plant grow "room", but unsure of what size fan...4" or 6"??
Please give me your thoughts and questions. Looking to buy soon. Thank you!
Click to expand...
David Ferguson said:
Building an indoor room with closed off plant room. Plant room itself is approx 8' x 5' (and 8',3" ceiling)...and I'll be growing just 4-6 plants max in this room.
A/C (8000 btu) blowing cool air IN, 1-2 oscillating fans, 2+ stationary fans, dehumidifier, etc. Insulation foam walls connected to wood frame.
Buying an AC INFINITY fan for exiting the plant grow "room", but unsure of what size fan...4" or 6"??
Please give me your thoughts and questions. Looking to buy soon. Thank you!
Click to expand...
BigDawg@1964 said:
My room I'm running 8000 btu window unit 8x12 room size with optic one led lights, which are great heat wise, running 6 in hydro active farm fan with 25 ft of duct and on days with 90 degree outside temps I run air on low and fan on medium and temps in grow room running 77 degrees so 6 in has worked great
Click to expand...
 
BigDawg@1964

BigDawg@1964

Active Member
Last couple of days I realize if I would of went with smaller fan it would of been difficult controlling humidity levels, 6 versus 4 inch just for that reason I would go with the 6 inch.
 
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