Look at SuperSuns from Sunlight Systems- they're discontinued now, but they had a really unique air cooling arrangement that might work well w/ your layout. Nice little footprint, too. I'm sure somebody out there has a couple in the back, still- or you could call Sunlight and see if they can help ya find some.

The SuperSun, not the SuperSun II.

Are we talking one muffin per reflector or one muffin running both, with ductwork interconnect? If we're talking one per reflector, I would just grab whatever is cheap and easy in 6" muffin- it'll do ya, go w/ any reflector that's got glass and 6" flanges.


If you wanna run two fixtures on one fan- muffins won't cut it.
You've got a fair amount of duct drag, so fan design gets to be an issue- if yer going 4", you'll probabley need more than a muffin, regardless of free-air cfm. Even @ 6", tho better.

Guesstimate that 70cfm throughput is gonna be overkill, depending on exterior temperature. Overkill here isn't a bad thing- you can always dial down.

I'm sure a 4" in-line would be more than enough, even dialed way down.

Have a look at bathroom exhaust blowers down @ the depot- they might have something cheaper than a grow-store inline, since you don't really need all that high a SP rating- but more than a muffin.

Ya might wanna flow it so that heated air moves from flower to veg- if it runs a little warmer in veg, it's not the end of the world.