Airflow/ filter questions

I have a 325 cu.feet tent. Running a 600 watt that will be air cooled. Wondering what's the best fan and filter to use. I'm talking cfm. I don't want to spend alot of money but I cannot have any smell and I will be in an attic in the summer time so I think air exchange will be important.

ANY info would be great. Never did a tent before. Correct if I'm wrong but Im thinking somewhere around 100cfm exhaust so I can can clear the room in 3 minutes. That would also allow me to go with a smaller charcoal filter. Then I would need a little bit smaller intake fan for fresh air to the plants. How do I prefilter this?? What are decent can filters? I saw some on ebay for under 50 but I don't want to be screwed by some off brand shit.

Thanks so much for any help. I'm about to get this grow going very soon.

325cfm÷3 minutes=108.3cfm MINIMUM. Add in the ducting/filter restrictions, your looking at around ~125cfm. Factor in the attic, heat of summer, a 600,etc., your looking at more like 200-250cfm, maybe more, I don't know all the variables. A 8" inline fan( not a duct fan! ) on a speed controller is probably what your looking at. Spend the $$ on a good fan that you can run down low if you need to, like 30%. My store brand hums below 50%, that kills electric motors.

Being in an attic, in summer, you could get to a point fans aren't going to do you any good, you might want to start considering some AC.

I agree ^^^^

Except for the part about an 8" fan. That would collapse a tent in seconds if the passive intake size isnt right. So even on a controller... if the controller is accidentally bump to full the tent is done...

Ask me how i know...lol

Lol. Well my tent does have a lot of ports and there are also some rectangle openings that I can use although I would prefer to bring in prefilter ed air from another room. I suppose I should test the fan with things open then close them off to see what happens....

bgmike8 said:

Lol. Well my tent does have a lot of ports and there are also some rectangle openings that I can use although I would prefer to bring in prefilter ed air from another room. I suppose I should test the fan with things open then close them off to see what happens....

Click to expand...

I would draw fresh air from an outside attic vent to a carbon filter to a 6 in inline fan 425cfm through the light fixture out the fixture to a duct muffler and exhaust through another attic vent directly outside. Peace