170 cfm okay for Air/Cooled 400 wtt HPS?

purplecream said:

^^ why even use an intake fan? doesnt the exhaust fan create enough negative pressure to just leave a little hole in the bottom or in a tent leave a flap open. then you can add your oscillating fan between your light and plants to get them a little bit closer. or am i wrong?

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Thats exactly what i was told and what i thought but it didnt work for me that way and until i tried it this way ive always had heat issues not saying that others cant achieve the same results with a different aproach but the passive intake as a lone source of new introduced air was not sufficent for me ive got more space in my grow room less heat quieter box happier plants...peace

By the way i only use now a half foot of duct to exaust my cooltube..

i think itll work for me because my tent is only 20" x 36" x 62".

purplecream said:

i think itll work for me because my tent is only 20" x 36" x 62".

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Hey bro try it man and be sure to keep your exaust up high nearer to the light heat source and blow your circulation fan under your plant canopy..Peace.6” EcoPlus Axial Fan 235 CFM
Code:6EPAF

Price:$52.95
Qty:1 they also have the 4" and these babies rock im going to change my whole new grow amoire to use these reasonable puppies i have 1 4" now in my set up for my assisted intake only 25.00 people are catching on to them when i got mine it was only 11.00 last year now look...

^^ what are you using those fans for?

purplecream said:

^^ what are you using those fans for?

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AT THE TIME I ONLY HAVE THE 4" and it is doing the bulk of my intake along with a 3 1/2" passive intake hole..Whan i began my new grow box in september i'll be using these kind only thats how much confidence i have in them, i'll use the 6"235 cfm for cooltube cooling pulling through a carbon filter and i'll use the 4" 112 cfm for my intake along with my 4" passive intake hole...got it all figured out..lol peace

let me know how it goes with that 6" out take with the carbon filter attached because im interested

purplecream said:

let me know how it goes with that 6" out take with the carbon filter attached because im interested

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will do bro!!