Sorry to hijack the thread but does this mean you only have the fans running every 2 mins?Fan's are usually more efficient pulling. I use passive intakes. I size my fans so I can exchange my enitre room every 2 minutes and plan intake on that as well.
You have to know how much air your fan moves. Then determine how often the grow space's air should be replaced. Common recommendation is 5 cfm per minute, but other factors like humidity and heat could influence the frequency of exchange.Sorry to hijack the thread but does this mean you only have the fans running every 2 mins?
No, CFM (Cubic feet/min) is the rating your fan has which is the cubic feet a minute it is capable of pushing(or pulling) air through the fan and filter if used. So if you have an 8x8x8 room, you have an 8*8*8 or 512 cubic feet room. So if you have a 512cfm fan, it would take 1 munute to scrub the entire room. So when the poster says "every 2 minutes" it is always on but all the air is cleansed ever 2 minutes. In this example he would be using a 256 cfm fan running constantly.Sorry to hijack the thread but does this mean you only have the fans running every 2 mins?
^^^^^^^^^^^^^^You have to know how much air your fan moves. Then determine how often the grow space's air should be replaced. Common recommendation is 5 cfm per minute, but other factors like humidity and heat could influence the frequency of exchange.
Whatever the frequency, some people put the fan on a switch. For example, on 5 minutes, off 5. I use a variac ($50) to control the speed. It's very quiet unlike the cheap $20 dimmer-like controllers. (There are also heat-controlled devices to increase the speed if the temperature get too high.).
LOL Sorry it means I exchange all the air in my room every 2 minutes. I don't turn it off. If you oversize buy a variac The cheap dimmers are hard on the fans too.Sorry to hijack the thread but does this mean you only have the fans running every 2 mins?
spot on.Fan's are usually more efficient pulling. I use passive intakes. I size my fans so I can exchange my enitre room every 2 minutes and plan intake on that as well.
How is pulling more efficient?spot on.
it creates what's called "negative pressure", which aids as well from natural pressure from the outer atmosphere. they work together.How is pulling more efficient?
How does that make the fan more efficient? A fan is always pushing and pulling in separate directions.it creates what's called "negative pressure", which aids as well from natural pressure from the outer atmosphere. they work together.
pushing air creates "positive pressure", which works against the outer atmosphere.
or something like that.
Also, negative pressure in your tent is definitely better for not allowing grow room smells to leak.How does that make the fan more efficient? A fan is always pushing and pulling in separate directions.
thank you.If the fan is on the front in a push configuration then all air must move through the fan first. This creates a baffle that interferes with the relative-motion airflow. This can be up to a 20% difference in efficiency.
The op didn't ask about carbon filters. "Spot on" was clearly just to boost your comments.thank you.
I have no clue why you are making this a personal argument. As for Carbon filters the OP merely asked about fans. He never asked anything about the reason for deploying them. So YOU went off topic first assuming heat and odour control. Now if you are really interested in fans you can either ask politely or simply go read on fan efficiency curves and how they are calculated as I had to do when I actually took Physics, sigh.The op didn't ask about carbon filters. "Spot on" was clearly just to boost your comments.
Complete speculation on your part. You obviously didn't read the thread.The op didn't ask about carbon filters. "Spot on" was clearly just to boost your comments.