Questions about fans for 4k watt system. upgrading from 2k

I'm wonder if using a can 8"High Output737 CFM fan pulling air from outside into my lights is enough.. I have the lights over 2 8x4 trays. on the side furthest from the fan I want to put in a Hydrofarm 8"inline fan that does 477.

This drawing is a pretty rough outline but it captures pretty well what I am thinking. Is the booster needed? Or perhaps it should be placed back behind the first reflector after the y split.

I think the booster is a good idea, as w/ boosting airflow it also limits air-flow(cause of the fan parts taking up space inside the duct). So with a max boosted rating of 477 and the longer duct run, looks like you should get about equal flow between runs.

I would change it slightly so the straight that goes up to the y is further along meaning that the lines across both sets of lights are exactly equal in length. This is very important when you are talking about airflow. Really you might want to look at using two fans. I use a 660 CFM to cool 2 600 watt lights and it is acceptable but the second light is slightly warm rather than cool.

Just my 2 cents !

Mouse

Also a valid solution AK, you beat me to it as well !

Mouse

mouse said:

I would change it slightly so the straight that goes up to the y is further along meaning that the lines across both sets of lights are exactly equal in length. This is very important when you are talking about airflow. Really you might want to look at using two fans. I use a 660 CFM to cool 2 600 watt lights and it is acceptable but the second light is slightly warm rather than cool.

Just my 2 cents !

Mouse

Click to expand...

So are you saying, I should run the Y farther out, so say both lines end up with equal length of ducting?

If so, my issue there is that the intake is a window, so if I push the Y out farther it will end up wrapping back to the first run of lights in a kind of S shape I think.

Doesnt matter where you put the Y it just matters that the two sections of air flow for the lights are of equal shape and length. Equal air flow is the only thing that matters here it has to be perfect. If you cant do that then I would look into two fans.

Hope that helps...

Mouse

Hmm, I think that is my only option, my idea will not work out. That other side is 6in hoods too, so I suppose if I got a good 6inch inline that would be sufficient?

Yeah although I would make sure its pretty powerful as I said I use a 660 cfm fan to cool two 600's and keep em nice and cool. IMO go Overkill on cooling. People rarely regret it.

Mouse