Push vs pull carbon filter/ventilation grow room set up?!!

Okay guys, I've been doing a lot of research for the past 1-2 months. I want to make sure everything, and I mean everything is perfect. I've already got almost everything ready, except the ventilation system down. Some people have been telling me pulling the air from two tents into the inline fan to one carbon filter is fine (PUSHING); but others are telling me using two carbon filters pulling the air from two tents into one fan is better (PULLING). Help! I really don't want ANY smell at all! I want the quietest, least smelliest configuration possible.

I followed this video (http://www.youtube.com/watch?v=xE61JM9dRlQ) for the "pushing" ventilation system method. However, wouldn't this kind of configuration make the pre-filter obsolete/useless since air is going into the carbon filter first then out of the pre-filter? I don't know, y'all will know more than me. Thanks for everything!

Here are my two layouts if you need better visualization.
LAYOUT 1: PUSHING
Two tents connected >> 4" insulated duct by T-splitter >> 4" S&P TD-100X inline fan (135 cfm) >> one 4" Phresh carbon filter (200 cfm)


LAYOUT 2: PULLING
Two tents connected >> two 4" Phresh carbon filters (200 cfm each x 2 = 400 cfm total) >> 6" insulated duct >> T-splitter >> one 6" S&P TD-150 inline fan (293 cfm)

since you have a small amount of watts i think the first setup would be better but remember that bends cause less airflow

have you thought of having a sealed room with closed light ventilation?

Carbon filter>>>>>inline fan>>>>>hood>>>>>out the tent. The arrows represent ducting. I would go with a separate setup for each tent......

2 filters i always bett than one!

polyarcturus said:

2 filters i always bett than one!

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TY for everyone's input. I think I'm just going to go with the first method. The only changes I'll make is to cut some pre-filters and place them at the beginning of the ducting for each tent. I'll use the pre-filter on the outside of the carbon filter as well to act as a sound muffler. What do you think?

Like I said before. Both ways will work for your set up. But if you go bigger the second way would be best at that time.

Warlock1369 said:

Like I said before. Both ways will work for your set up. But if you go bigger the second way would be best at that time.

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Yeah I'll keep that in mind in the future. I'm only using two 4x2x5 (40 ft3 x 2 = 80 ft3 total) currently right now any way. I wish I had a basement, but homes in TX don't have them. LOL.