ventilation

[ljak1407]

Hey whats up. So im looking to add a carbon scrubber as its starting to smell dank lol. I found a 4" fan scrubber combo for a decent price. The fan is 220cfm. I dont have the best setup for my hood which is just a 6 inch fan sucking air through my hood (grow room air not fresh unfortunately) i have a 4 in fan not sure of cfm sucking fresh air in. They are all just plain duct fans from home depot except for the combo im buying. So my question is with a 6 and 4 inch fan sucking air out, a 4 inch fan blowing in, will i have negative pressure? I want to get to where i can leave the door closed. Should i flip the 6 inch to blow air through my hood? Whats your take? I cant put anymore holes in the wall. Tia and smoke up friends

 

[jujment699]

Hey whats up. So im looking to add a carbon scrubber as its starting to smell dank lol. I found a 4" fan scrubber combo for a decent price. The fan is 220cfm. I dont have the best setup for my hood which is just a 6 inch fan sucking air through my hood (grow room air not fresh unfortunately) i have a 4 in fan not sure of cfm sucking fresh air in. They are all just plain duct fans from home depot except for the combo im buying. So my question is with a 6 and 4 inch fan sucking air out, a 4 inch fan blowing in, will i have negative pressure? I want to get to where i can leave the door closed. Should i flip the 6 inch to blow air through my hood? Whats your take? I cant put anymore holes in the wall. Tia and smoke up friends

Hey, in my experiece with fans, i find 4" to be useless. almost all ducting and light parts do not fit with 4". I ended up buying one for pretty cheap on amazon, and immediately upgraded to a 6" just a few months later realizing it couldn't do the job.

You might want to take a look at this neat little article, it helped me pick my setup!

 

[hotrodharley]

With your present setup the added fan should help provide negative pressure. All things considered.