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Thanks Jon, So I would need an 8" fan just to cool my lights? I was expecting using something much smaller, and quieter And I'm going to vent them through the attic and out of the side of the house, There are some vents. Also, how can I tell if the lights, cool tube hoods, are completely sealed?

I am trying to decide how to vent my grow room (5x10x8). I was initially going to run a 6 inch inline fan (425 cfm) to pull air through my carbon filter and 3 600 watt cooltube hoods. I recently found out this is probably not enough power for that. So I was thinking of using a 6 inch inline duct...

Thank you chas, very informational.

Thanks man, I'm debating on what size fan to bring air into the room. I don't really want to use those big inline fans because of the noise, ya know?

Alright, So I built a 10x10 room. I split this room into 2 5x10 rooms, one for veg and one for flower. Now, I need a little advice on how I should vent it. I am planning on putting a 6in inline fan and carbon filter (425 cfm) in the flower room that will also be attached to 3 600 watt cool tubes...

What an awesome journal!!! I am planning a 3000 watt grow pretty soon, first grow ever. I was wondering what the avg change in your electricity bill was? I'm pretty paranoid about a huge jump in electricity. Any info would help. Anywho, great grow!

Awesome grow. I'm planning on a 3000 watt hps grow myself. I was wondering how much your electricity bill jumped? I'm pretty sketched out about that. Thanks.