Inline fan size question

Kcannabis

Kcannabis

Member
I need to get a inline fan with a carbon filter on it and I'm not sure what size to get. I have a 5 ft x 5 ft x 6 ft room which I calculated needs 80 - 180 cfm for air exchange. I just have a passive intake and 400w non cooled hps. I need it to go 20 ft and then T into my 4" dryer vent. So I wanted to run 4" pipe to it but I'm not sure if I should get a 4" 180 cfm fan or a 6" 440cfm fan and reduce it to 4". Would I be better off with the 4" or 6" inline fan through 4" pipe?
Will they be powerful enough to push air through all that ducting pipe?
 
ripe fruit

ripe fruit

Member
Kcannabis said:
I need to get a inline fan with a carbon filter on it and I'm not sure what size to get. I have a 5 ft x 5 ft x 6 ft room which I calculated needs 80 - 180 cfm for air exchange. I just have a passive intake and 400w non cooled hps. I need it to go 20 ft and then T into my 4" dryer vent. So I wanted to run 4" pipe to it but I'm not sure if I should get a 4" 180 cfm fan or a 6" 440cfm fan and reduce it to 4". Would I be better off with the 4" or 6" inline fan through 4" pipe?
Will they be powerful enough to push air through all that ducting pipe?
Click to expand...
get the 6 inch. i run one through 2 400w hps. i have a 4*3 area with a pasive intake as well. the 475cfm fan keeps the light cool enough while another fan circulates the fan. and i do run my 475 cfm fan through a carbon filter.
 
Kcannabis

Kcannabis

Member
ripe fruit said:
get the 6 inch. i run one through 2 400w hps. i have a 4*3 area with a pasive intake as well. the 475cfm fan keeps the light cool enough while another fan circulates the fan. and i do run my 475 cfm fan through a carbon filter.
Click to expand...
so I could get a 6" inline fan with a filter and then reduce the duct to 4" then run it 20 feet into a Y or T and it should be able to cool it enough?

Any suggestions as to what 6" filter/combo to go with and from where?

Also, do you run a fan control on yours and if so what do you have to keep the speed at to cool yours?

Thanks!
 
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