Hi, I am building a jumbo grow box, much like the one posted by badgr, but with some slight modifications. Today I just finished my ventilation system. I cut two eight inch by eight inch intake squares (one for flowering chamber and one for veg chamber) and placed light proof/ dark room vents (louvers). I have a TD 200 Mixvent S&P fan exhausting through an eight inch tube out the top of cab.. (476 cfm) I read the post VENTILATION 101, and my cab is slightly harder to open due to the air flow. Is this a problem? Do I need more intake? Is this positive or negative pressure? Any help would be appreciated.
Ventilation Help!!! (Freezer Boy Help Please)
- Thread starter fifa
- Start date
It's negative pressure and that's what you want.
The designated hitter rule is a commie plot!
fifa, sounds like you're doing good. Negative pressure comes from the increased airflow inside the cab compared to the relatively still air outside. Negative pressure attracts, positive pressure repulses. It's why airplanes fly or curveballs curve. Negative (good) pressure tries to suck everything in, including the door. The only escape is through the scrubber. Positive (bad) pressure would make closing the door difficult. Everything is trying to escape the cab without fighting through the resistance of the scrubber.
Thank you all for the help, I appreciate it. Here are a few pics, and I have not put the carbon filter on. I plan to run another 100 cfm S &P for the 400 W cool tube I will be running in the veg. This however, will not run through the carbon scrubber feel it is unnecessary.
I can post more pictures tomorrow if wanted?
I can post more pictures tomorrow if wanted?
